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Vitamin D

Also known as: Cholecalciferol, vitamin D3, calciferol

Moderate EvidenceMicronutrientTelogen EffluviumAlopecia Areata

Deficiency is common in hair loss patients; correction may support hair cycling and immune regulation.

Regrowth Potential20%
Long-Term Viability55%

Mechanism of Action

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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