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

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Synopsis

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

Biotin, also known as vitamin B7, is commonly included in supplements marketed for hair growth and the treatment of hair loss or thinning. The scientific justification for biotin's use in this context is limited primarily to cases of biotin deficiency, which is rare in the general population. Biotin plays a crucial role in the metabolism of fatty acids, amino acids, and glucose, and severe deficiency can lead to hair thinning, skin rashes, and brittle nails. There are well-documented case reports showing that supplementation can reverse hair loss in individuals with a diagnosed biotin deficiency, such as those with genetic disorders affecting biotin metabolism, individuals with chronic alcoholism, or pregnant women with increased requirements. However, for the vast majority of people experiencing hair loss unrelated to biotin deficiency, clinical studies have not demonstrated a significant benefit from biotin supplementation. A 2017 systematic review concluded that while biotin supplementation may improve hair and nail growth in patients with underlying deficiency, there is insufficient evidence to support its use in healthy individuals or those with hair loss from other causes (e.g., androgenetic alopecia, telogen effluvium). Despite this, biotin maintains popularity due to anecdotal reports and aggressive marketing. In summary, the scientific evidence supports the use of biotin for hair loss only in the context of deficiency, and not as a general remedy for hair thinning or loss in otherwise healthy individuals.

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