Evidence supporting the use of: Vitamin D3
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Vitamin D3 is increasingly studied for its potential role in supporting hair health and treating hair loss or thinning, particularly in conditions such as telogen effluvium and alopecia areata. Scientific interest in vitamin D3 stems from the discovery that vitamin D receptors are present in hair follicles. Research suggests that vitamin D is involved in the creation of new hair follicles and may play a role in the anagen (growth) phase of the hair cycle. Several observational studies have found that individuals with hair loss, especially those with autoimmune-related hair loss (e.g., alopecia areata), often have lower serum vitamin D levels than healthy controls. Some small interventional studies and case reports have indicated that correcting vitamin D deficiency may promote hair regrowth in these populations. However, high-quality, large randomized controlled trials are lacking, and not all studies have demonstrated benefit. As a result, while there is a plausible biological mechanism and some supportive data, the evidence is still considered preliminary. Vitamin D3 supplementation is generally recommended for individuals with documented deficiency, but its routine use as a primary treatment for hair loss is not yet established by clinical guidelines. Further research is needed to clarify which subgroups may benefit, optimal dosing, and long-term outcomes.

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