Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Protect Fair Skin From Sunburn: NCI lists red or blond hair, fair skin that freckles and burns easily rather than tans, and a history of many blistering sunburns as a child or teenager among the risk factors for melanoma. It also counts sunlamps and tanning beds as sources of UV radiation. Shade during the strongest hours, long sleeves, a hat and sunglasses, and broad-spectrum sunscreen all reduce burning. NCI is candid about the limits: sunscreen has been shown to prevent sunburns and actinic keratoses, but it has not been proven that using it protects against melanoma. NCI
Know Why Red Hair Burns: MC1R signalling pushes melanocytes toward eumelanin, the dark brown pigment, through a cAMP-dependent pathway. Loss-of-function MC1R variants inhibit eumelanin synthesis and are strongly associated with red hair and fair skin, leaving mostly pheomelanin, the reddish-yellow pigment. Pheomelanin is more prone to photodegradation than eumelanin and, unlike eumelanin, is not an efficient scavenger of reactive oxygen species. Melanocytes with functional MC1R also repair UV-induced DNA damage more efficiently and express more antioxidant enzymes, so sun sensitivity is not only a matter of how light the hair looks. International Journal of Molecular Sciences (PMC)
Look Past Visible Hair Color: The M-SKIP pooled analysis combined 17 studies, 5,160 cutaneous melanoma cases and 12,119 controls. Carriers of any MC1R variant had a 66% higher risk of melanoma than wild-type subjects (summary odds ratio 1.66, 95% CI 1.41 to 1.96). The association was strongest in darker-pigmented participants: among people with no freckles, no red hair and skin that tans reasonably well, the summary odds ratio was 3.14 (95% CI 2.06 to 4.80), while among those who already had those red-hair features it was 1.16 (95% CI 0.88 to 1.52). Visible hair color is only a rough guide to UV sensitivity, so sun-protective habits are worth keeping even with brown hair. International Journal of Cancer (PMC)
Report Moles That Change: Fair skin and red or blond hair sit alongside moles on NCI's list of melanoma risk factors, but NCI is clear that very few dysplastic nevi or common moles turn into melanoma and that most melanomas do not start as either. The changes worth reporting are a mole that changes color, gets smaller or bigger, changes shape, texture or height, becomes dry or scaly, feels hard or lumpy, itches, or bleeds or oozes. NCI estimates melanoma risk is about 10 times greater for someone with more than five dysplastic nevi than for someone who has none. Noticing a change and raising it with a clinician is the useful step. NCI
Expect No Cure For Early Graying: A 2024 review reports that as much as 90% of the variability in hair graying can be attributed to genetic factors, and that variants such as rs12203592 in an intron of IRF4 have been associated with graying. Smaller case-control studies measured lower serum vitamin B12 and copper and higher oxidative stress markers in people who gray early, and smoking generates reactive oxygen species, but these samples are small and the findings are inconsistent, with serum iron reported both higher and lower. The same review states that to date no known medical therapies can reverse or prevent premature hair graying. This is where honest advice is thin: there are good reasons not to smoke, and restoring hair pigment is not a proven one. International Journal of Dermatology (PMC)
How much of this is genetic?
Genetics explains 90% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Twin and GWAS heritability estimates (Morgan et al. 2018, Nat Commun)
Background and further reading
Hair color is determined by the amount and type of melanin produced by pigment cells in the hair follicle. Two forms of melanin set the shade: eumelanin, which is brown-black, and pheomelanin, which is red-yellow. Dark hair reflects abundant eumelanin, blond hair reflects little eumelanin, and red hair reflects a relative shift toward pheomelanin. Natural hair color also tends to change over a lifetime, often darkening from childhood into adulthood before greying later in life, so a genetic leaning describes the underlying tendency rather than a fixed outcome.
Genetic Basis: Hair color is among the most heritable of all visible human traits, with twin and family studies placing heritability near 90% or higher. It is highly polygenic: large genome-wide studies in hundreds of thousands of people have identified well over 100 associated regions that together explain most of the inherited variation. The pigmentation gene HERC2/OCA2 strongly influences the blond-to-brown axis (and also eye color), while genes such as KITLG, SLC24A4, SLC45A2, TYR, TYRP1, IRF4, and EXOC2 further tune shade and intensity. Red hair is largely governed separately by variants in the MC1R gene, which shift pigment production toward pheomelanin; because most red-hair variants are recessive, red hair often appears only when two copies are inherited.
Environmental and Other Factors: Because natural hair color is so strongly genetic, day-to-day environment plays only a small role in the shade you are born with. Sun exposure can lighten hair slightly, and age brings gradual darkening in youth followed by greying as pigment cells decline. Nutrition and general health influence hair condition more than base color. A polygenic score captures the inherited tendency along the dark-to-light spectrum, but it does not account for hair dye, sun bleaching, or the natural changes that occur across a lifetime, and pigmentation genetics has been best characterized in people of European ancestry.
The published research behind your score, and the variants it draws on.
19 published scores from 4 studies
The hair color score combines 19 polygenic scores drawn from 4 published studies.
These traits are influenced by some of the same genes and variants as this one
Content updated August 2026.
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