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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.

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

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.

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.

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

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

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

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

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

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

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

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

Human hair color is influenced by complex biochemical processes involving enzymes and reactive oxygen species.

Red light promotes hair growth by directly stimulating hair cells and improving cell communication.

Iron therapy cured the boy's hair color issue.

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

Tandem repeats significantly influence hair color, especially darker shades, across different ancestries.

Reticulocyte hemoglobin content is the best indicator of iron deficiency in women with diffuse non-scarring hair loss.

Hair turning darker can be a sign of skin cancer.