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Redheaded people have higher levels of vitamin D precursor, suggesting their hair color may be an adaptation to low sunlight areas.

Red hair is linked to worse health, especially in women.

Redheaded people have higher levels of a vitamin D precursor, suggesting red hair may be an adaptation for better vitamin D synthesis in areas with less sunlight.

Redheaded people may have evolved to efficiently make vitamin D in areas with less sunlight.

Fair skin, not red hair, affects health due to possible vitamin D deficiency.

Dark hair with a red beard likely evolved for camouflage, not attraction.

Two red-haired men with alopecia areata regrew black hair instead of red.

Human hair color is determined by melanin types and genetic factors.

Hair color is determined by melanin types and gene activity.

MC1R gene variations affect skin, hair color, UV sensitivity, and melanoma risk.

A boy's hair turned red because of genetic mutations, not lack of zinc.

A 14-year-old girl's black hair showed unique color changes, suggesting early greying.

Baricitinib treatment led to dark brown hair regrowth in a red-haired woman with alopecia areata.

A girl with red hair developed hair-pulling and body image disorders after being bullied for her hair color.

A 22-year-old's gray hair partially turned back to its original color without known causes.

Iron deficiency can cause hair color changes, which can be reversed with iron supplements.

A 91-year-old woman's hair turned black in one spot, with skin changes underneath.

Iron can be present in hair color changes without overall iron deficiency.

TRH in hair follicles can influence hair color by increasing melanin.

A 76-year-old man's grey hair turned back to its original color after radiotherapy.

New genetic locations explain much of hair color variation in Europeans.

Iron therapy cured the boy's hair color issue.

Premature graying of hair may suggest health issues and currently lacks effective treatments.

AMPK activation may reduce melanoma risk in red-haired individuals.

Vitamin B12 deficiency can cause skin and hair color changes, which can be reversed with treatment.

Hair turning darker can be a sign of skin cancer.