Also known as: Cholecalciferol, vitamin D3, calciferol
Deficiency is common in hair loss patients; correction may support hair cycling and immune regulation.
Vitamin D receptors (VDR) are expressed in hair follicle keratinocytes and play a critical role in hair follicle cycling, particularly the transition from telogen to anagen. Vitamin D also modulates the immune system — relevant to alopecia areata — and regulates genes involved in keratinocyte differentiation.
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