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

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Synopsis

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

Vitamin D is sometimes used to support or treat hair loss or thinning, primarily based on emerging scientific evidence rather than tradition. Several studies have investigated the relationship between vitamin D status and various forms of hair loss, especially alopecia areata (an autoimmune form of hair loss). Research shows that individuals with certain types of hair loss often have lower serum vitamin D levels compared to healthy controls. Some small interventional studies have suggested that correcting vitamin D deficiency may help improve hair growth in these patients. For example, a 2013 study found that women with telogen effluvium—one common type of diffuse hair shedding—had significantly lower vitamin D levels than healthy controls.

However, the evidence is not robust, and large, well-controlled trials are lacking. Most studies are observational and cannot prove causation, and some have methodological limitations. There is insufficient evidence to recommend vitamin D supplementation solely for hair growth in individuals with normal vitamin D levels. Current clinical guidelines generally recommend correcting vitamin D deficiency for overall health, but not specifically for hair loss unless a deficiency is documented. In summary, while there is a scientific rationale and some supporting evidence, it remains limited and inconclusive, warranting a moderate-low evidence score for this use.

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