Sunscreen and Evolution
- NOTOC**
Sunscreen and Evolution
Human beings have been responding to solar radiation for far longer than manufactured sunscreen has existed. Long before creams, lotions, ultraviolet filters, and sun-protection-factor ratings were developed, biological evolution had produced several mechanisms for coping with sunlight. Human skin pigmentation, tanning, DNA repair, epidermal thickening, sweating, hair loss, and behavioral adaptations all became part of a complex relationship between humans and ultraviolet radiation.
The evolution of human pigmentation is especially important to understanding modern photoprotection. Melanin acts as a naturally occurring sunscreen by absorbing and scattering ultraviolet radiation and helping protect cells from DNA damage. Populations whose ancestors lived for long periods in regions with intense ultraviolet radiation generally evolved greater constitutive pigmentation, while populations living in regions with weaker ultraviolet radiation often evolved lighter pigmentation through several different genetic pathways.
Modern sunscreen can therefore be viewed as a technological extension of an ancient biological problem: how to obtain the benefits of sunlight while limiting its damaging effects.
Human Evolution and Ultraviolet Radiation
Ultraviolet radiation has exerted important selective pressures during human evolution. Early members of the human lineage gradually lost much of the dense body hair characteristic of other primates while developing exceptionally high densities of eccrine sweat glands. These adaptations improved the ability to dissipate heat during sustained activity but also exposed the skin more directly to solar radiation.
Strong epidermal pigmentation became particularly important in tropical environments where ultraviolet radiation is intense throughout much of the year. Eumelanin absorbs ultraviolet radiation and reduces penetration into deeper layers of the skin, where UV can damage DNA and affect important cellular processes.
The geographic distribution of human skin pigmentation broadly corresponds to long-term patterns of ultraviolet radiation. Darker pigmentation is most strongly associated with regions of intense UV exposure, while lighter pigmentation became more common in populations occupying higher latitudes or regions with weaker ultraviolet radiation.
This relationship is not a simple division between dark- and light-skinned populations. Human pigmentation is highly variable, polygenic, and influenced by migration, gene flow, natural selection, diet, culture, and population history.
Melanin as a Natural Sunscreen
Melanin is one of the most important natural photoprotective systems in human skin.
Melanocytes manufacture pigment that is transferred to surrounding skin cells. The pigment absorbs radiation and helps shield cellular DNA from ultraviolet damage. Greater concentrations of eumelanin generally provide greater natural protection against ultraviolet penetration.
Eumelanin and pheomelanin differ substantially in their photochemical behavior. Eumelanin is generally associated with stronger protection against UV-induced oxidative stress and DNA damage. Pheomelanin, which is more abundant in some light-skinned and red-haired phenotypes, can contribute to oxidative reactions under certain conditions.
Studies comparing differently pigmented human skin show that greater constitutive pigmentation is associated with lower amounts of ultraviolet-induced DNA damage in important epidermal cell populations.
Melanin does not provide complete protection. Even highly pigmented skin can experience DNA damage, photoaging, hyperpigmentation, and skin cancer after sufficient ultraviolet exposure.
The Vitamin D and Folate Tradeoff
One influential explanation for the evolution of human pigmentation involves the competing biological effects of ultraviolet radiation.
High UV exposure can damage biological molecules and may contribute to folate degradation. Folate plays important roles in cellular division, reproduction, fetal development, and other physiological processes. Strong pigmentation may therefore have provided a reproductive advantage in regions with intense ultraviolet radiation.
Ultraviolet B radiation is also required for the production of vitamin D in human skin. When human populations migrated into regions with weaker UVB radiation, very dark pigmentation could reduce the efficiency of cutaneous vitamin D production.
This created an evolutionary tradeoff.
In environments with intense sunlight, stronger pigmentation offered increased protection. In environments where UVB radiation was scarce, reduced pigmentation could increase the amount of radiation reaching the skin and improve vitamin D production.
The vitamin D–folate hypothesis proposes that much of human pigmentation evolution reflects a balance between these opposing pressures.
Modern research suggests that the history was more complicated. Diet, clothing, cultural practices, migration, tanning ability, latitude, genetics, and other physiological adaptations also influenced the relationship between pigmentation and ultraviolet radiation.
Genetic Evolution of Human Pigmentation
Human skin pigmentation is controlled by many genes rather than a single genetic switch.
Research has identified important roles for genes including SLC24A5, SLC45A2, OCA2, MC1R, ASIP, KITLG, TYR, MFSD12, and others.
One of the most important findings from modern genetics is that lighter pigmentation did not evolve only once.
European and East Asian populations developed lighter skin through partly different genetic pathways, an example of convergent evolution. Similar environmental pressures can therefore produce comparable visible traits through different genetic changes.
Research in African populations has also revealed extraordinary pigmentation diversity and ancient genetic variants affecting skin color. These findings challenge simplistic ideas that African populations are genetically uniform in pigmentation.
Ancient DNA has transformed this field by showing that pigmentation alleles changed substantially during relatively recent European and Eurasian history. Some variants associated with lighter skin rose to high frequency only during the last several thousand years.
Tanning as an Evolutionary Response
Human pigmentation has both constitutive and facultative components.
Constitutive pigmentation refers to the baseline amount of pigment present without recent sun exposure. Facultative pigmentation refers to tanning—the increased production or redistribution of pigment following exposure to ultraviolet radiation.
Tanning can provide some additional protection against subsequent UV exposure, although it does not make intense or prolonged exposure safe.
Research suggests that tanning is part of a broader cellular response to UV-induced DNA damage. DNA-damage signaling can stimulate melanogenesis and activate repair mechanisms.
Different populations vary in tanning ability. Some researchers argue that facultative pigmentation deserves greater attention when reconstructing the evolution of human responses to changing ultraviolet environments.
Skin Cancer and Evolutionary Photoprotection
Ultraviolet radiation is a major cause of skin damage and contributes to several forms of skin cancer.
The importance of pigmentation as natural protection can be seen especially clearly among people with albinism living in high-UV environments. Studies from several African countries have documented exceptionally high rates of ultraviolet-related skin damage and squamous-cell carcinoma among people with little or no protective melanin.
These observations demonstrate the biological importance of pigmentation under intense solar exposure.
Whether skin cancer itself was an important selective force in the original evolution of dark human pigmentation remains debated. Many skin cancers occur relatively late in life, which can reduce their effect on reproductive fitness. Other researchers argue that severe or lethal skin cancers in intensely exposed populations could still have contributed to selection.
The evolutionary importance of pigmentation probably involved several overlapping pressures rather than a single cause.
From Biological Sunscreen to Cultural Photoprotection
Humans also developed cultural ways of controlling sun exposure.
Clothing, hats, veils, shelters, shade, umbrellas, plant preparations, mineral pigments, and changes in daily activity have been used by different societies to reduce exposure to intense sunlight.
Clothing is particularly significant because it can provide substantial ultraviolet protection without requiring changes in human biology. Fabric type, weave, thickness, color, and treatment influence how much radiation reaches the skin.
Culture can therefore alter evolutionary pressures. A population using extensive clothing may experience a different relationship between pigmentation and sunlight than a population with similar ancestry but greater skin exposure.
Diet can also change the relationship. Foods rich in vitamin D can partly compensate for reduced cutaneous production, while dietary changes associated with agriculture may have increased selection for lighter pigmentation in some populations.
Changing Cultural Attitudes Toward Sunlight
Human attitudes toward sunlight have changed dramatically.
In many societies, pale skin was historically associated with social status because people who worked outdoors were more likely to become tanned. During the twentieth century, Western beauty culture increasingly portrayed tanning as fashionable, healthy, affluent, and attractive.
Recreational sunbathing and indoor tanning greatly increased intentional exposure to ultraviolet radiation.
This cultural change occurred far more rapidly than biological evolution could respond. People whose pigmentation evolved under particular environmental conditions could suddenly expose themselves to levels and patterns of UV radiation very different from those experienced by their ancestors.
The result illustrates evolutionary mismatch: ancient biological adaptations interacting with rapidly changing cultural environments.
The Development of Modern Sunscreen
Modern sunscreen emerged from centuries of attempts to shield human skin from sunlight.
Early protective practices relied on clothing, mineral substances, botanical materials, and physical shade. During the twentieth century, researchers increasingly identified specific wavelengths responsible for sunburn and developed chemicals capable of absorbing ultraviolet radiation.
Early sunscreens focused primarily on UVB because UVB is strongly associated with sunburn.
The development of the sun protection factor, or SPF, created a standardized way to measure protection against erythema caused primarily by UVB radiation.
Researchers later recognized that UVA also contributes substantially to skin aging, pigmentary changes, immune effects, oxidative stress, and carcinogenesis.
Modern photoprotection therefore shifted toward broad-spectrum products designed to protect against both UVA and UVB.
What Sunscreen Protects Against
Controlled studies show that appropriate sunscreen use can reduce several biological consequences of ultraviolet exposure.
Sunscreens can reduce UV-induced DNA damage, sunburn, some forms of immune suppression, and visible signs of photoaging.
A major randomized Australian trial and subsequent follow-up studies provided evidence that regular sunscreen use can reduce certain skin cancers and may reduce melanoma incidence.
Daily sunscreen use has also been associated with less measurable photoaging.
Protection depends heavily on how sunscreen is used. Laboratory SPF values are measured using standardized application amounts that are often substantially greater than the amount people apply in everyday life.
Applying a thin layer can therefore provide far less protection than the number printed on the bottle suggests.
Sunscreen should be considered one part of photoprotection rather than permission to remain in intense sunlight indefinitely.
UVA, UVB, and the Limits of SPF
SPF primarily measures protection against sunburn-producing radiation.
That creates an important limitation: preventing visible redness does not necessarily mean that all forms of ultraviolet injury have been prevented.
Research has shown that UV-related immune suppression and other biological effects can occur even when sunburn is limited.
Modern broad-spectrum sunscreen standards therefore place greater emphasis on UVA protection in addition to UVB protection.
Long-wavelength UVA is particularly challenging because it penetrates deeper into the skin and requires filters that remain effective across a wider portion of the solar spectrum.
Sunscreen and Skin of Color
Naturally darker skin provides greater baseline ultraviolet protection than lightly pigmented skin, but it does not eliminate the effects of solar radiation.
People with darker skin can experience photoaging, DNA damage, skin cancers, melasma, post-inflammatory hyperpigmentation, and other sunlight-related disorders.
Sunscreen research historically included disproportionately few participants with darker skin types. More recent work emphasizes photoprotection appropriate for the full range of human pigmentation.
Cosmetic acceptability is also important. Some mineral sunscreens leave a visible white residue on darker skin, discouraging regular use. Tinted formulations and newer technologies are being developed to provide broad-spectrum protection while matching diverse skin tones.
Visible Light and the Expanding Meaning of Photoprotection
Modern photoprotection increasingly extends beyond ultraviolet radiation.
Visible light can stimulate persistent pigmentation, particularly in darker skin types and among people with melasma or post-inflammatory hyperpigmentation.
Traditional transparent chemical sunscreens primarily target ultraviolet wavelengths and may provide little protection against visible light.
Iron oxides used in tinted sunscreens can reduce visible-light-induced pigmentation.
This has led to a broader conception of sunscreen. Future products may be evaluated not only by SPF and UVA protection but also by protection against visible wavelengths and possibly other components of solar radiation.
Sunscreen, Vitamin D, and Evolutionary Mismatch
The relationship between sunscreen and vitamin D has generated continuing debate.
Because UVB radiation drives vitamin D production in the skin, it is biologically plausible that sufficiently effective sunscreen could reduce vitamin D synthesis.
Real-world studies have produced mixed results because sunscreen is rarely applied as completely or consistently as laboratory protocols require.
Recent research continues to investigate whether intensive long-term sunscreen use can measurably reduce vitamin D levels.
The issue reflects the same evolutionary tradeoff that helped shape human pigmentation: ultraviolet radiation is both biologically useful and potentially damaging.
Photoprotection therefore seeks to limit harmful exposure without necessarily eliminating all exposure to sunlight.
Sunscreen Safety and Systemic Absorption
Modern sunscreen ingredients include organic UV filters and inorganic mineral filters such as zinc oxide and titanium dioxide.
Studies under maximal-use conditions have shown that several organic sunscreen ingredients can be detected in the bloodstream after topical application.
Detection does not itself demonstrate that these compounds cause harm. It does, however, create questions about pharmacology, long-term exposure, testing requirements, and regulation.
Research continues into photostability, skin penetration, endocrine effects, nanoparticle behavior, allergic reactions, environmental persistence, and alternative UV filters.
The history of sunscreen therefore continues to evolve as scientific understanding and regulatory expectations change.
Environmental Effects of Sunscreens
Sunscreen protects people from ultraviolet radiation, but some sunscreen chemicals can enter aquatic environments through swimming, wastewater, and other pathways.
Laboratory studies have examined the effects of organic and inorganic UV filters on corals, algae, fish, microorganisms, and other marine organisms.
The environmental significance of these effects under real-world conditions remains an active area of research. Concentrations used in laboratory experiments do not always correspond to environmental exposure levels.
Nevertheless, concern about persistence, bioaccumulation, and ecological toxicity has encouraged research into more biodegradable and environmentally compatible photoprotective compounds.
Natural Sunscreens in Other Organisms
Humans are far from the only organisms that need protection from ultraviolet radiation.
Plants, microorganisms, algae, fish, and other organisms have evolved biochemical compounds capable of absorbing or dissipating UV energy.
Cyanobacteria produce scytonemin, a pigment that functions as a natural ultraviolet shield. Evolutionary research suggests that biological sunscreen systems of this kind may be billions of years old.
Marine organisms produce mycosporine-like amino acids and related compounds that absorb ultraviolet radiation efficiently.
Fish can use gadusol, another naturally occurring UV-absorbing molecule. Research in zebrafish has shown that mothers can provide gadusol to embryos, protecting developing offspring from UV-induced DNA damage.
These natural systems demonstrate that evolution has repeatedly produced molecular solutions to the problem of solar radiation.
Learning from Evolution to Design Better Sunscreens
Natural photoprotective compounds are increasingly being investigated as models for future sunscreen technologies.
Mycosporine-like amino acids, scytonemin, carotenoids, melanins, antioxidants, and other biologically derived compounds may offer combinations of UV absorption, photostability, antioxidant activity, and biodegradability.
Researchers are also developing nanocarriers intended to keep sunscreen ingredients near the surface of the skin, improve photostability, increase cosmetic acceptability, and reduce unwanted systemic penetration.
Future sunscreens may combine several forms of protection:
- UVB filtering;
- UVA and UVA1 protection;
- visible-light protection;
- antioxidants;
- enhanced DNA-protective mechanisms;
- improved photostability;
- reduced environmental persistence;
- and formulations tailored to different skin types and pigmentation disorders.
The technological evolution of sunscreen increasingly resembles the biological evolution of photoprotection: multiple defensive mechanisms working together rather than reliance on a single protective system.
Photoprotection Beyond Sunscreen
Sunscreen is most effective when used as part of a broader strategy.
Shade, protective clothing, hats, sunglasses, scheduling outdoor activity to avoid periods of intense radiation, and avoiding deliberate tanning can substantially reduce exposure.
Researchers have also investigated oral and topical antioxidants and plant-derived compounds as supplemental photoprotective strategies.
These approaches should not be understood as substitutes for established physical and topical protection. Instead, they reflect increasing interest in combining several defensive mechanisms, much as biological organisms evolved multiple layers of protection against solar radiation.
Evolutionary Mismatch in the Modern World
Human migration now occurs much faster than genetic adaptation.
A person whose ancestors evolved under one ultraviolet environment may live in a dramatically different one. Highly pigmented individuals living at high latitudes may face increased risk of inadequate vitamin D production, while lightly pigmented individuals living in high-UV environments may experience increased risk of sunburn and ultraviolet-related skin damage.
Modern transportation, indoor living, clothing, diet, supplements, sunscreen, occupational patterns, and recreational behavior further alter exposure.
For this reason, ancestry alone does not determine appropriate sun behavior. Individual pigmentation, latitude, season, lifestyle, medical history, age, diet, and the amount and type of sun exposure all influence the balance between risk and benefit.
A Continuing Evolution of Photoprotection
The history of sunscreen is not separate from human evolution. It is the newest stage in a much older history of adaptation to sunlight.
Biological evolution produced melanin, tanning, DNA repair, epidermal responses, and variation in pigmentation. Cultural evolution added clothing, shelter, shade, behavioral practices, and eventually manufactured sunscreens.
Scientific and technological evolution then produced SPF testing, broad-spectrum UVA protection, improved mineral and organic filters, tinted visible-light protection, nanotechnology, antioxidants, and investigations of naturally evolved sunscreen molecules.
The result is an increasingly sophisticated system of artificial photoprotection layered on top of biological defenses that evolved over millions of years.
Conclusion
Sunlight has simultaneously been a biological necessity and an evolutionary hazard throughout human history. Ultraviolet radiation contributes to vitamin D production while also damaging DNA, degrading biological molecules, altering immune responses, accelerating skin aging, and increasing skin-cancer risk.
Human pigmentation evolved partly in response to these competing pressures. Melanin became a powerful natural sunscreen, but migration into different ultraviolet environments repeatedly altered the balance between protection and vitamin D production. Different populations evolved different genetic solutions, demonstrating that human skin color is a dynamic evolutionary adaptation rather than a fixed biological division among people.
Culture later transformed this relationship. Clothing, shade, diet, migration, changing beauty standards, recreational tanning, and modern sunscreen altered patterns of solar exposure faster than human genes could adapt.
Modern sunscreen represents an extension of the same evolutionary problem. Its development from basic UVB filters to broad-spectrum UVA protection, visible-light protection, nanotechnology, antioxidants, and biologically inspired compounds shows that photoprotection continues to evolve culturally and technologically.
Future sunscreen research may increasingly draw lessons from organisms that have survived ultraviolet radiation for billions of years. In that sense, the next generation of sunscreens may combine modern chemistry with some of evolution's oldest solutions to life under the Sun.
- TOC**
Human Evolution, Skin Pigmentation, and Photoprotection
1. The Genetics and Evolution of Human Pigmentation | Multiple authors | Biology | 2025
Reviews MC1R, SLC24A5, TYR, OCA2, and other pigmentation genes and explains how different UV environments produced convergent and population-specific adaptations.
Reviews dozens of pigmentation genes and shows how migration, UV environments, gene flow, and natural selection contributed to population differences in skin color.
Updates the evolutionary evidence linking solar regimes, pigmentation, migration, cultural adaptation, and vitamin D while discussing modern mismatches between ancestry and environment.
Integrates UV geography, pigmentation genes, vitamins, antioxidant nutrients, migration, diet, and cultural behavior into a broad model of human pigmentation evolution.
Summarizes pigmentation biology and evolution while also discussing how a biological adaptation to ultraviolet environments became socially interpreted in ways that affect health.
Presents pigmentation as a dynamic outcome of UV exposure, migration, population history, tanning ability, cultural behavior, diet, and natural selection.
Reviews competing explanations for global skin-color diversity and emphasizes that several forms of natural selection shaped pigmentation rather than a single evolutionary process.
8. Evolution of Human Skin Color and Vitamin D | Nina G. Jablonski | Vitamin D, Fourth Edition | 2018
Describes the evolutionary transition from darkly pigmented African ancestors to repeated episodes of depigmentation associated with migration into lower-UV environments.
Examines why intense epidermal pigmentation evolved in early humans and why pigmentation later decreased in some populations, including alternative barrier and metabolic hypotheses.
Explores the diversity of African pigmentation in relation to solar environments, genetics, migration, admixture, and the long evolutionary history of Homo sapiens in Africa.
Connects ancient adaptations to solar radiation with modern problems created when people live in UV environments very different from those experienced by their ancestors.
Explains how dark eumelanin-rich skin evolved under intense tropical UV radiation while depigmentation was favored in lower-UV environments where vitamin D production became more difficult.
Reviews proposed selective pressures for darker and lighter skin, including UV protection, folate preservation, vitamin D production, climate, diet, and other environmental factors.
Reviews the unusually strong geographic differentiation of human pigmentation and discusses natural selection, photoprotection, vitamin D production, and health implications.
Examines global skin-color variation as an evolutionary adaptation to ultraviolet radiation, linking pigmentation patterns with latitude, UV exposure, photoprotection, and physiological requirements.
Pigmentation Genetics and Population Adaptation
Uses functional genomics to identify regulatory variants affecting melanin levels and evidence of local adaptation within African populations.
Reports selection involving PAH and suggests changes in tanning response contributed to the evolution of lighter pigmentation in East Asia.
Reconstructs ancient changes near ASIP that altered pigmentation during different stages of hominin and European evolutionary history.
19. The Selection Landscape and Genetic Legacy of Ancient Eurasians | Multiple authors | Nature | 2024
Uses extensive ancient-genome data to reconstruct strong selection on SLC24A5 and SLC45A2 and the timing of pigmentation changes across Eurasia.
Uses ancient genomes to recover selection signals, including strong evidence involving the major European pigmentation locus SLC24A5.
Reveals major regional differences in ancient European pigmentation-associated alleles and reconstructs population changes over tens of thousands of years.
Reviews African pigmentation diversity and evolutionary signals involving MFSD12, DDB1, SLC24A5, and other loci shaped by selection, migration, and admixture.
Examines Native American pigmentation and vitamin D genetics as a test of simple latitude-based evolutionary models.
Finds pigmentation variants in Latin Americans that illuminate independent skin-lightening adaptations in western and eastern Eurasia.
Reviews pigmentation pathways, genome-wide association studies, ancestry differences, and the evolutionary forces shaping human color variation.
Shows that the SLC24A5 light-pigmentation allele entered southern Africa through migration and subsequently experienced strong selection.
Examines how migration, natural selection, sexual dimorphism, social structure, and ultraviolet radiation contribute to pigmentation diversity across India.
Suggests that KITLG variants were selected not only for pigmentation but also for physiological adaptation to colder Eurasian environments.
Identifies multiple pigmentation loci in diverse African populations and demonstrates the deep evolutionary history and global distribution of several dark-pigmentation alleles.
Investigates pigmentation genes potentially shaped by adaptation to ultraviolet environments in South Asian populations.
Argues that facultative tanning deserves greater attention as an evolved UV-protection mechanism, especially in East Asian and American populations.
Shows that an East Asian OCA2 variant reduces pigmentation, supporting independent evolutionary routes toward lighter skin.
Demonstrates measurable pigmentation effects from two OCA2 variants common in East Asian populations.
Uses ancient DNA to show substantial recent changes in frequencies of European pigmentation alleles.
Tracks ancient European pigmentation alleles and shows SLC24A5 and SLC45A2 rising at different times during prehistory.
Identifies numerous pigmentation genes with genomic signatures consistent with recent natural selection in East Asian populations.
Shows that evidence for selection varies according to genetic test and locus, illustrating the complexity of reconstructing pigmentation evolution.
Provides further evidence that light pigmentation evolved partly independently in European and East Asian populations.
Provides evidence that lighter pigmentation evolved independently in Europe and East Asia through partly different genetic pathways.
Compares pigmentation genes across Africans, Europeans, and Asians and finds population-specific signatures of selection.
Examines ASIP across primates and helps place human pigmentation mechanisms in a broader mammalian evolutionary context.
Compares pigmentation genes among Europeans, Chinese, and Africans and identifies strong population differentiation and candidate selection signals.
Finds an independently evolved Neanderthal MC1R variant suggesting substantial pigmentation diversity among Neanderthals.
Establishes SLC24A5 as a major pigmentation gene and a key contributor to lighter skin pigmentation in European populations.
Finds strong evolutionary constraint on MC1R in Africa but greater tolerated variation after human populations dispersed into lower-UV environments.
Ultraviolet Radiation, Vitamin D, Folate, and Melanin
Reviews evidence for the hypothesis that human depigmentation evolved partly to maintain vitamin D synthesis after migration into lower-UV regions.
Tests relationships among UV exposure, pigmentation, folate, vitamin D, and relevant genetic variants using biophysical and population data.
Reviews the relationship between pigmentation, vitamin D biology, ancient population movements, and alternative genetic adaptations to low-UV environments.
Describes the competing evolutionary demands for UV protection near the equator and efficient vitamin D production at higher latitudes.
Reviews the proposal that pigmentation balances two UV-sensitive biological needs: protecting folate while permitting adequate vitamin D photosynthesis.
Systematically reviews experiments and finds that sunscreen substantially reduces ultraviolet-induced DNA damage in living human skin.
Examines geographic gradients in pigmentation and vitamin D-related genes as potential signatures of adaptation to different ultraviolet environments.
Explains how melanin is both photoprotective and capable under some conditions of contributing to delayed DNA damage after UV exposure.
Evaluates whether health and reproductive consequences of vitamin D deficiency could have generated sufficient selection for lighter skin at high latitudes.
Shows that biologically important UV damage can occur without obvious sunburn and reviews evidence that sunscreen can reduce this damage.
Presents early evidence that intense light can degrade folate and proposes folate protection as an evolutionary advantage of dark skin.
An early evolutionary analysis connecting latitude, ultraviolet availability, skin pigmentation, vitamin D production, and geographic human adaptation.
Sunscreen History, Effectiveness, Safety, and Modern Photoprotection
Reviews organic and inorganic filters, photostability, systemic absorption, nanotechnology, environmental concerns, and emerging sunscreen materials.
Reports laboratory evidence that broad-spectrum sunscreen can reduce UV-related DNA damage, tissue disruption, and short-term telomere shortening.
Traces sunscreen from ancient photoprotection practices to modern formulations while discussing safety, regulation, skin tone, and public attitudes.
Evaluates whether sunscreen meaningfully reduces circulating vitamin D and finds a modest association while emphasizing remaining uncertainties.
Reviews human safety questions, systemic absorption, endocrine concerns, mineral alternatives, and environmental effects of sunscreen ingredients.
Synthesizes more than 100 studies on sunscreen filters and marine organisms while identifying substantial gaps between laboratory toxicity studies and real-world exposure.
Relates changes in sunscreen technology to scientific discoveries, changing leisure patterns, consumer behavior, and increasingly personalized photoprotection.
Finds that darker skin types remain substantially underrepresented in sunscreen research despite significant risks from pigmentation disorders and solar damage.
Provides a detailed clinical comparison of sunscreen ingredients and explains how protection needs differ by wavelength and dermatological condition.
67. Photoprotection in Skin of Color | Multiple authors | Current Dermatology Reports | 2023
Reviews physiological differences in how sunlight affects darker skin and discusses sunscreen and other protective strategies.
Examines the protective benefits of melanin while emphasizing that darker pigmentation does not eliminate photoaging, pigmentation disorders, or skin-cancer risk.
Discusses the need for cosmetically acceptable broad-spectrum sunscreens designed for diverse skin tones and pigmentary conditions.
Provides a concise timeline from naturally pigmented early humans and traditional sun-protection practices to modern sunscreen technologies.
Expands photoprotection beyond UVB by emphasizing UVA and visible light, particularly for pigmentary disorders in darker skin.
Reviews persistent misconceptions that naturally higher melanin levels eliminate the need for sun protection.
Reviews the accumulation, transformation, bioaccumulation, and potential biological effects of UV-filter chemicals in aquatic environments.
74. History of Sunscreen: An Updated View | Yousheng Ma | Journal of Cosmetic Dermatology | 2021
Reviews sunscreen development from ancient protective materials through UVB filters, SPF testing, UVA protection, regulation, and visible-light photoprotection.
Extends absorption studies to additional sunscreen ingredients and formulations while emphasizing that detection does not by itself establish harm.
Demonstrates measurable systemic absorption of several organic sunscreen ingredients under maximal-use experimental conditions.
Reviews observational studies and trials, illustrating how behavior and study design complicate estimates of sunscreen's population-level cancer-prevention effect.
78. Sunscreens: An Update | Multiple authors | American Journal of Clinical Dermatology | 2017
Reviews UV filters, broad-spectrum protection, regulations, photostability, controversies, formulation issues, and patient sunscreen use.
Reports improvements in pigmentation, texture, and other visible signs of photodamage during consistent daily sunscreen use.
80. The History of Sunscreen | Adam S. Aldahan et al. | JAMA Dermatology | 2015
Describes traditional sun-protective materials and the development of modern products designed specifically to reduce ultraviolet exposure.
Evaluates sunscreen benefits for preventing UV-related skin damage while reviewing regulatory and safety debates.
Finds significantly less measurable skin aging among people assigned to daily sunscreen use over several years.
Shows that actual protection falls sharply when sunscreen is applied more thinly than the amount used in standardized SPF testing.
Long-term follow-up of an Australian randomized trial found fewer melanomas among participants assigned to daily sunscreen use.
Reviews clinical research demonstrating why UVA protection became an important part of modern broad-spectrum sunscreen design.
Demonstrates that protection against sunburn does not necessarily equal protection against all biological effects of ultraviolet radiation.
Shows the importance of UVA protection in preventing UV-related immune suppression even when UVB protection is similar.
Reports the landmark Nambour randomized trial examining whether routine sunscreen use reduces keratinocyte cancers.
Shows that broad UVA as well as UVB protection can prevent an important biological consequence of acute UV exposure.
Provides early human evidence that sufficiently protective sunscreen can reduce ultraviolet-induced suppression of immune responses in the skin.
Natural Sunscreens and the Evolution of UV Protection
Demonstrates that zebrafish mothers provide embryos with gadusol, a natural sunscreen whose evolutionary retention closely tracks exposure of young fish to ultraviolet radiation.
Reviews naturally evolved UV-absorbing compounds as possible biodegradable alternatives to conventional sunscreen filters.
Surveys molecular defenses evolved by marine organisms and evaluates their potential as natural photoprotective ingredients for human skin.
Reviews MAAs, scytonemin, and related defenses evolved by algae and cyanobacteria as models for environmentally compatible sunscreen filters.
Integrates fossil, genetic, biochemical, and living-animal evidence to examine how melanin and its functions—including ultraviolet protection—evolved across vertebrates.
Reviews endogenous melanin as a natural UV defense and evaluates plant- and marine-derived compounds capable of supplementing human photoprotection.
Uses the evolutionary history of scytonemin, a cyanobacterial UVA-screening pigment, to infer that biological sunscreen mechanisms are billions of years old.
Examines UV-protective molecules evolved by plants and animals and considers how their photochemistry can inspire safer artificial sunscreens.
Reviews mycosporine-like amino acids, scytonemin, carotenoids, and other natural molecules that aquatic organisms use to survive intense ultraviolet radiation.
Reviews the evolution and biological functions of UV-absorbing compounds found across diverse marine and freshwater organisms.
Evolutionary Adaptation, UV Radiation, and Human Pigmentation
101. | Multiple authors | Molecular Biology and Evolution | 2026
Reassesses the skin-cancer hypothesis for dark pigmentation through evolutionary mismatch involving lightly pigmented migrants and populations living under intense UV radiation.
102. | Multiple authors | Genetics and Evolution Review | 2026
Reviews the polygenic architecture of pigmentation and how UV exposure, migration, culture, clothing, diet, and population history interact with natural selection.
103. | P. Burge and A. Madaree | South African Medical Journal | 2026
Examines primary skin malignancies in Black Africans with oculocutaneous albinism and provides recent evidence of extreme susceptibility associated with deficient melanin.
104. | Multiple authors | Evolutionary Anthropology | 2025
Uses skin pigmentation as a major example of gene-culture coevolution and argues that cultural practices can alter both adaptive and neutral genetic evolution.
105. | Multiple authors | Review Article | 2025
Synthesizes international evidence on skin cancer among people with albinism and identifies solar UV exposure and inadequate photoprotection as major preventable risks.
106. | Hannah Simba et al. | British Journal of Cancer | 2025
Discusses extraordinarily high nonmelanoma skin-cancer risks among people with albinism and calls for expanded research and preventive photoprotection.
107. | Multiple authors | Solar Radiation and Human Health Review | 2023
Reviews long-term changes in biologically important UVB radiation and discusses the evolutionary and public-health significance of balancing UV benefits and risks.
Examines hairlessness, sweating, skin pigmentation, diet, migration, and vitamin D through the framework of human evolutionary history.
109. | Multiple authors | International Journal of Dermatology | 2020
Compares skin cancers in albino and nonalbino Africans, providing evidence about how pigmentation changes the anatomical distribution and age of onset of UV-related cancers.
110. | Yana G. Kamberov et al. | Journal of Human Evolution | 2018
Compares primates to reconstruct the independent evolution of reduced fur and greatly increased eccrine sweat-gland density that helped expose human skin to solar radiation.
111. | Multiple authors | Journal of Skin Cancer | 2015
Reviews squamous-cell carcinoma among people with oculocutaneous albinism and highlights melanin's natural protective role against chronic UV exposure.
112. | Daniel L. Osborne and Raymond Hames | American Journal of Physical Anthropology | 2014
Uses life-history theory to reconsider whether protection from skin cancer could have contributed to selection for dark pigmentation in ancestral humans.
113. | Mel Greaves | Proceedings of the Royal Society B | 2014
Proposes that lethal skin cancers in highly UV-exposed early humans could have exerted significant selection favoring strongly melanized skin.
114. | Samson Kimaiyo Kiprono, Baraka Michael Chaula and Helmut Beltraminelli | BMC Cancer | 2014
Reviews a decade of skin cancers among African people with albinism and documents the strong association between equatorial UV exposure and cancer.
115. | Multiple authors | Photochemistry and Photobiology | 2014
Reviews sun-related health effects and photoprotection strategies for people with oculocutaneous albinism in sub-Saharan Africa.
116. | Nina G. Jablonski and George Chaplin | Philosophical Transactions of the Royal Society B | 2012
Explores how human migration moved populations into UV environments different from those in which their pigmentation evolved, creating modern mismatches involving vitamin D deficiency and skin disease.
117. | Johan Moan, Kristian Pagh Nielsen and Asta Juzeniene | FASEB Journal | 2012
Proposes that immediate UVA-induced pigment darkening may have evolved partly to protect circulating folate from photosensitized degradation.
118. | Nina G. Jablonski and George Chaplin | Proceedings of the National Academy of Sciences | 2010
Examines human pigmentation as an adaptation to geographically varying ultraviolet radiation and describes the opposing selective pressures of photoprotection and vitamin D production.
119. | R. Khan and B.S. Razib Khan | Medical Hypotheses | 2010
Proposes a gene-culture model in which agriculture reduced dietary vitamin D and intensified selection favoring depigmentation in some Eurasian populations.
120. | Multiple authors | International Journal of Dermatology | 2009
Describes skin cancers among Nigerian people with albinism and emphasizes the interaction between lack of melanin and intense solar UV exposure.
121. | Multiple authors | Journal of the American Academy of Dermatology | 1995
Reports severe actinic damage among people with albinism in equatorial Tanzania and demonstrates the practical importance of hats, clothing, shade, and sunscreen.
122. | Multiple authors | South African Medical Journal | 1989
Documents high rates of UV-related skin cancer among South Africans with albinism, illustrating the protective importance of melanin in intense sunlight.
Melanin as an Evolved Sunscreen
123. | Multiple authors | Journal of Photochemistry and Photobiology B | 2025
Examines how age and pigmentation affect the persistence and repair of DNA damage after suberythemal UV exposure.
124. | Multiple authors | Pigment Cell & Melanoma Research | 2024
Reviews MC1R-mediated eumelanin synthesis, oxidative-stress resistance, DNA repair, and attempts to produce UV-independent protective tanning.
125. | Multiple authors | Journal of Clinical Medicine | 2023
Reviews visible-light effects on melanogenesis and pigment disorders and discusses the need for broader-spectrum photoprotection.
126. | Stefania Guida et al. | Journal of Investigative Dermatology | 2022
Reviews MC1R functions in pigmentation and DNA-damage repair and explores the receptor as a potential target for pharmacological photoprotection.
127. | Multiple authors | Photochemistry and Photobiology | 2021
Systematically reviews how visible wavelengths influence melanocyte biology and skin pigmentation.
128. | Multiple authors | Photochemical & Photobiological Sciences | 2020
Shows that visible light can induce persistent pigmentation, particularly in darker skin, expanding photoprotection beyond traditional UVA and UVB.
129. | Multiple authors | Photochemistry and Photobiology | 2018
Reviews eumelanin, pheomelanin, MC1R, and DNA repair as interacting determinants of natural photoprotection.
130. | Shosuke Ito, Kazumasa Wakamatsu and Tadeusz Sarna | Photochemistry and Photobiology | 2018
Explores the different photochemical behavior of eumelanin and pheomelanin and why one tends to be protective while the other can contribute to oxidative damage.
131. | Multiple authors | Molecular Biology Review | 2016
Reviews MC1R structure and function and explains how the receptor couples pigmentation with nucleotide-excision repair of UV photolesions.
132. | Multiple authors | Pigment Cell & Melanoma Research | 2014
Reviews MC1R signaling beyond pigmentation, including direct effects on cellular responses to ultraviolet radiation.
133. | Multiple authors | Photochemistry and Photobiology | 2014
Reviews the complex oxidative chemistry of pheomelanin and its contribution to melanoma risk in red-hair phenotypes.
134. | Multiple authors | British Journal of Dermatology | 2013
Shows that melanocytes in strongly pigmented skin sustain substantially less UV-induced DNA damage than melanocytes in lighter skin.
135. | Multiple authors | Photochemical & Photobiological Sciences | 2012
Reviews how UVB, UVA, visible light, and infrared radiation produce different forms of erythema, pigment darkening, and tanning.
136. | Multiple authors | Photochemistry and Photobiology | 2012
Reviews both protective and damaging effects of solar radiation on melanocytes and pigmentation.
137. | Multiple authors | Photochemistry and Photobiology | 2008
Reviews biological effects of visible light on human skin, including pigmentation, reactive oxygen species, and thermal effects.
138. | Multiple authors | Pigment Cell & Melanoma Research | 2008
Explains how MC1R signaling controls eumelanin production, tanning, oxidative stress, DNA repair, and susceptibility to melanoma.
139. | Multiple authors | Pigmentation Research Review | 2007
Reviews the regulation of constitutive pigmentation and tanning and explains how epidermal melanin reduces UV penetration and DNA damage.
140. | Multiple authors | Journal of Investigative Dermatology | 2006
Demonstrates that upper-epidermal pigment protects deeper stem-cell and melanocyte populations from UV-induced DNA damage.
141. | Multiple authors | Journal of Investigative Dermatology | 2006
Shows that both total melanin content and MC1R function independently influence UV-induced DNA damage and repair in melanocytes.
142. | Multiple authors | FASEB Journal | 2003
Finds an inverse relationship between constitutive melanin content and ultraviolet-induced DNA damage in human skin.
143. | Ana Luisa Kadekaro et al. | Pigment Cell Research | 2003
Reviews eumelanin and pheomelanin and explains why eumelanin is generally a more effective defense against UV penetration and oxidative damage.
144. | Multiple authors | Journal of Investigative Dermatology | 2002
Demonstrates that p53 helps regulate tyrosinase expression and connects DNA-damage detection with the tanning response.
145. | Multiple authors | Der Hautarzt | 2002
Reviews tanning and DNA-repair pathways as natural photoprotective responses and explores methods of stimulating them without UV exposure.
146. | G. Ling et al. | Acta Dermato-Venereologica | 2001
Examines thymine-dimer repair, p53 activation, melanin, and sunscreen protection following controlled ultraviolet exposure of human skin.
147. | Barbara A. Gilchrest et al. | Photochemistry and Photobiology | 1999
Proposes that UV-induced DNA damage itself serves as a signal activating tanning, enhanced DNA repair, and other evolutionarily conserved photoprotective responses.
148. | Barbara A. Gilchrest et al. | Photochemistry and Photobiology | 1996
Reviews cellular mechanisms responsible for ultraviolet-induced pigmentation and the development of a protective tan.
149. | Barbara A. Gilchrest et al. | Journal of Investigative Dermatology | 1993
Shows that stimulating repair of UV-induced DNA damage can enhance melanogenesis, strengthening the connection between tanning and cellular DNA-defense mechanisms.
150. | N. Kollias et al. | Journal of Photochemistry and Photobiology B | 1991
Reviews the physical and biochemical properties that allow melanin to function as a naturally occurring ultraviolet filter.
UV Damage, Cancer, and Photoadaptation
151. | Multiple authors | Solar Radiation and Human Health Review | 2023
Reviews long-term changes in biologically important UVB radiation and discusses the evolutionary and public-health significance of balancing UV benefits and risks.
152. | Jörg Reichrath | Sunlight, Vitamin D and Skin Cancer | 2020
Uses human evolution and Paleolithic environments to examine the difficult balance between beneficial sunlight exposure and UV-mediated skin damage.
153. | Multiple authors | Cancer Biology Review | 2018
Reviews molecular mechanisms through which UVA and UVB contribute to melanoma, including DNA mutations, reactive oxygen species, melanin chemistry, and immunosuppression.
154. | M. Garmyn, A.R. Young and S.A. Miller | Photochemical & Photobiological Sciences | 2018
Reviews photoadaptation—the increase in resistance produced by repeated UV exposure—and examines the respective roles of pigmentation and epidermal thickening.
155. | Multiple authors | Journal of Investigative Dermatology | 2018
Finds that low UV doses can simultaneously generate vitamin D and DNA damage, while darker pigmentation protects deeper epidermal layers.
Cultural Evolution of Sun Exposure and Protection
156. | Multiple authors | Behavioral Health Research | 2026
Examines how beauty standards contribute to intentional tanning and the “sunscreen paradox,” in which sunscreen can be incorrectly treated as permission for prolonged UV exposure.
157. | Anne K. Julian, Rebecca A. Ferrer and Frank M. Perna | Psychology & Health | 2023
Reviews sunscreen, clothing, shade, behavioral interventions, and psychological factors influencing real-world sun-protection practices.
158. | Multiple authors | Photodermatology, Photoimmunology & Photomedicine | 2022
Reviews clothing as a major cultural photoprotective technology and explains how fabric structure, color, fibers, and treatments determine ultraviolet protection factor.
159. | Multiple authors | Photodermatology, Photoimmunology & Photomedicine | 2019
Investigates motivations for tanning and sunscreen use and finds that appearance and avoidance of sunburn frequently outweigh concern about long-term cancer prevention.
160. | Michael C. Kirchberger et al. | Photodermatology, Photoimmunology & Photomedicine | 2017
Uses internet-search behavior to show declining interest in tanning beds and increasing interest in sunscreen across multiple countries.
161. | Multiple authors | Dermatologic Clinics | 2017
Reviews personalized photoprotection for children and people with darker skin, including shade, clothing, hats, sunglasses, and sunscreen.
162. | Multiple authors | Health Communication Research | 2015
Examines how popular magazines simultaneously encouraged sunscreen while continuing to portray tanned skin as attractive.
163. | Priti Bandi et al. | Pediatric Dermatology | 2010
Examines changes in parental sunscreen use, hat use, sunburn, and indoor tanning and illustrates how cultural practices can counteract biological photoprotection.
164. | Multiple authors | Archives of Dermatology | 2009
Examines fashion magazines from the 1920s and documents the rapid cultural transition from valuing pale skin to promoting suntanning.
165. | Multiple authors | Public Health Review | 2009
Reviews historical and contemporary attitudes toward tanning and how changing beauty ideals helped increase recreational ultraviolet exposure.
166. | Multiple authors | Archives of Dermatology | 2008
Compares attitudes toward indoor tanning from 1988 through 2007 and shows that greater knowledge of melanoma risk did not eliminate tanning behavior.
167. | Multiple authors | Journal of Photochemistry and Photobiology B | 2001
Traces sun protection from ancient clothing, veils, hats, umbrellas, and plant preparations to nineteenth-century experiments with UV-absorbing compounds.
168. | H.W. Randle | Mayo Clinic Proceedings | 1997
Reviews the dramatic cultural transition from avoiding sunlight to viewing suntanning as healthy and fashionable during the twentieth century.
169. | Multiple authors | Archives of Dermatology | 1997
Tracks changes in public knowledge and behavior concerning sun exposure, sunscreen, tanning, and sunburn over a decade.
170. | Multiple authors | Preventive Medicine | 1992
Finds links between knowledge about ultraviolet hazards and subsequent sunscreen behavior after community skin-cancer screening.
Evolution of Sunscreen Science and Technology
171. | Multiple authors | ACS Pharmacology & Translational Science | 2026
Reviews emerging nanosystems designed to improve UV-filter performance while reducing unwanted penetration and formulation limitations.
172. | Multiple authors | British Journal of Dermatology | 2025
Reports the Sun-D randomized trial, finding that routine year-long SPF 50+ sunscreen use reduced vitamin-D levels compared with discretionary sunscreen use.
173. | Multiple authors | Nanotechnology Review | 2025
Examines nano-sized titanium dioxide, zinc oxide, lipid carriers, polymer systems, sustainability, safety, and the next generation of multifunctional sunscreens.
174. | Nicole Natarelli et al. | Journal of Medicinal Food | 2025
Systematically reviews dietary carotenoids, polyphenols, Polypodium leucotomos, vitamins, and other oral approaches intended to supplement topical sunscreen.
175. | José Adão Carvalho Nascimento Júnior et al. | AAPS PharmSciTech | 2024
Systematically reviews nanocarrier technologies designed to improve sunscreen efficacy, stability, cosmetic acceptance, and safety.
176. | Multiple authors | Chemosphere | 2024
Reviews octocrylene formulations and efforts to use nanotechnology to improve performance while addressing environmental and photochemical concerns.
177. | Multiple authors | Regulatory Science Review | 2021
Traces the evolution of European sunscreen regulation, including approved UV filters, UVA requirements, photostability, efficacy testing, and labeling.
178. | Multiple authors | Photochemical & Photobiological Sciences | 2021
Reviews two decades of developments in zinc oxide, titanium dioxide, chemical UV filters, photostability, UVA protection, and skin-cancer prevention.
179. | Multiple authors | Pharmaceutical Technology Review | 2015
Reviews methods developed to stabilize avobenzone, illustrating the technological evolution required to maintain UVA protection during sunlight exposure.
180. | Multiple authors | Photodermatology, Photoimmunology & Photomedicine | 2014
Reviews the evolution of SPF and UVA testing and emerging alternatives to intentionally irradiating human volunteers during sunscreen evaluation.
181. | Multiple authors | Journal of the American Academy of Dermatology | 2014
Reviews sunscreen development, testing, efficacy, regulation, photostability, UV filters, and controversies surrounding modern photoprotection.
182. | Steven Q. Wang et al. | Photochemical & Photobiological Sciences | 2012
Analyzes hundreds of American sunscreens from 1997 through 2009 and documents increasing SPF values and changes in UVA protection.
183. | Multiple authors | British Journal of Dermatology | 2010
Compares avobenzone, zinc oxide, and titanium dioxide and finds important differences in their ability to provide long-wavelength UVA protection.
184. | Multiple authors | Photochemistry and Photobiology | 2000
Demonstrates that broad-spectrum sunscreen substantially reduces solar-simulated UV damage to DNA and tissue architecture in engineered human skin.
Enhancing Human Photoprotection Beyond Sunscreen
185. | Multiple authors | Photochemical & Photobiological Sciences | 2021
Reviews Polypodium leucotomos extract as an oral and topical photoprotectant affecting antioxidants, inflammation, DNA repair, and UV-induced immune responses.
186. | Multiple authors | International Journal of Molecular Sciences | 2016
Reviews antioxidant, anti-inflammatory, DNA-protective, and immunological actions of fern-derived photoprotection.
187. | Multiple authors | Journal of Clinical and Aesthetic Dermatology | 2015
Reviews Polypodium leucotomos as a possible supplemental defense against UV-induced erythema, oxidative stress, photoaging, and photocarcinogenesis.
188. | Multiple authors | Photochemical & Photobiological Sciences | 2010
Examines molecular mechanisms through which plant-derived antioxidants could complement conventional UV-filtering sunscreens.
189. | Multiple authors | Photoprotection Research | 2007
Reviews cellular evidence that Polypodium leucotomos can supplement endogenous defenses by reducing oxidative damage, DNA injury, and UV-induced cell death.
Visible-Light Protection and the Next Generation of Sunscreens
190. | Multiple authors | Journal of Investigative Dermatology | 2026
Presents international consensus recommendations on the biological effects, testing, and practical use of visible-light photoprotection.
Reviews the expansion of sunscreen science from UVB and UVA toward long-wave UVA1, visible light, antioxidants, personalized photoprotection, and environmental considerations.
192. | Multiple authors | Dermatology Review | 2026
Reviews iron oxides in tinted sunscreens and evaluates their increasingly important role in blocking visible light associated with persistent hyperpigmentation.
193. | Multiple authors | Clinical Dermatology Review | 2026
Reviews strategies for preventing visible-light-driven post-inflammatory hyperpigmentation when conventional tinted sunscreens are cosmetically unacceptable.
194. | Multiple authors | International Journal of Dermatology | 2023
Reviews tinted sunscreens and explains why iron oxides can protect against visible wavelengths that conventional transparent sunscreens transmit.
195. | Multiple authors | Journal of the American Academy of Dermatology | 2022
Identifies gaps in traditional UV-centered photoprotection and discusses iron oxide, titanium dioxide, antioxidants, and other defenses against visible light.
196. | Multiple authors | Journal of Investigative Dermatology | 2021
Reviews methods for measuring protection against visible-light-induced pigmentation and calls for standardized testing comparable to SPF and UVA ratings.
197. | Multiple authors | Journal of Drugs in Dermatology | 2020
Demonstrates that iron-oxide formulations protect darker skin from visible-light-induced pigmentation more effectively than an untinted mineral sunscreen.
198. | Multiple authors | Photodermatology, Photoimmunology & Photomedicine | 2014
A randomized trial finds that sunscreen containing iron-oxide pigments protecting against visible light improves melasma outcomes compared with UV-only sunscreen.
Natural Sunscreens and Evolutionary Models for Future Products
199. | Multiple authors | Experimental Dermatology | 2017
Reviews mycosporine-like amino acids as naturally evolved, photostable UV absorbers and antioxidants with potential application as environmentally compatible human sunscreens.
200. | Qunjie Gao and Ferran Garcia-Pichel | Nature Reviews Microbiology | 2011
Reviews naturally evolved microbial sunscreens—including scytonemin, mycosporines, and melanins—and explains how microorganisms evolved biochemical defenses against intense ultraviolet radiation.
