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

Three new gene mutations cause rickets and hair loss, treatable with high calcium and calcidol, but hair regrowth is rare.

Balanced vitamin D levels are crucial to delay aging and prevent related diseases.

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