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the claim

Biotin supplements reduce hair thinning in people who are not biotin deficient.

the verdict
CONTESTED PARTIAL
Recorded sources
1 source for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that biotin supplements reduce hair thinning in people who are not biotin deficient?

Partly. The retrieved items do not settle whether biotin supplements reduce hair thinning in people who are not biotin deficient. One small trial of a multi-ingredient supplement containing biotin reported improved hair measures, while a clinic explainer and a consumer vitamin book question biotin's benefit for hair.

Verdict: CONTESTED PARTIAL · 1 source for, 2 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 1
Evaluation of Tolerance and Trichological Efficacy of a Food Supplement in Men and Women with Telogen Effluvium-like Disorder
2022
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Evaluation of Tolerance and Trichological Efficacy of a Food Supplement in Men and Women with Telogen Effluvium-like Disorder. (2022). doi.org. https://doi.org/10.3390/cosmetics9060135

Evidence against · 2
Does Biotin Really Work for Hair Growth?
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Does Biotin Really Work for Hair Growth?. (n.d.). health.clevelandclinic.org. https://health.clevelandclinic.org/is-biotin-as-good-as-advertised-for-your-hair-loss

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More against · 1
The Vitamin Book
1979
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The Vitamin Book. (1979). books.google.com. http://books.google.com/books?id=ZQXYAAAAMAAJ&dq=Biotin+supplements+reduce+hair+thinning+in+people+who+are+not+biotin+deficient.&hl=&as_pt=BOOKS&source=gbs_api

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