Moderate evidencevitamin
Vitamin D for Hair Thinning
Vitamin D receptors (VDR) are highly expressed in hair follicle keratinocytes and are essential for hair follicle cycling, particularly the anagen (growth) phase initiation. Deficiency is associated with alopecia areata and telogen effluvium.
How strong is the research?
Moderate evidence
Based on cohort study data — strong observational evidence.
How much to take
2000–4000 IU
Vitamin D receptors are expressed in hair follicles. Test levels and correct deficiency for hair regrowth.
When to take it
Best taken: morning