Evidence supporting the use of: Vitamin B3 (unspecified)
For the health condition: Hair (loss or thinning)

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Synopsis

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

Vitamin B3, which includes niacin and niacinamide, has some scientific basis for its use in supporting hair health, though the evidence is limited and not robust. Niacin is involved in cellular energy production and DNA repair, and adequate levels are essential for the health of skin, hair, and nails. Some small studies and case reports suggest that a deficiency in niacin (pellagra) can lead to hair loss or thinning, which is typically reversible upon supplementation. However, pellagra is rare in developed countries, and niacin deficiency is not a common cause of hair loss in the general population.

Beyond deficiency states, there is little high-quality clinical research showing that supplementation with Vitamin B3 improves hair growth or reduces hair loss in individuals without a demonstrated deficiency. Some hair products contain niacin with claims that it increases blood flow to the scalp and supports hair follicle health, but these claims are based on limited or anecdotal evidence, and systematic reviews have not established a strong benefit. In summary, while Vitamin B3 is essential for overall health and deficiency can cause hair loss, the use of niacin supplements for hair loss in otherwise healthy individuals is not well supported by strong scientific evidence.

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