Evidence supporting the use of: Vitamin B7 (biotin)
For the body system: Hair

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Table of Contents

Synopsis

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

Biotin (Vitamin B7) is commonly marketed and used as a supplement to support hair health and growth. The rationale for its use is based on the observation that biotin deficiency can lead to hair thinning and hair loss, as well as skin and nail problems. However, true biotin deficiency is rare in individuals consuming a normal diet, and most people obtain sufficient amounts from food sources.

Scientific studies supporting the use of biotin supplementation for improving hair growth in individuals without deficiency are limited and generally of low quality. The majority of evidence consists of case reports or small studies in people with underlying biotin deficiency, certain genetic disorders (such as biotinidase deficiency), or other medical conditions. In these populations, biotin supplementation has been shown to improve hair and nail growth.

For healthy individuals without biotin deficiency, there is insufficient evidence from rigorous clinical trials to confirm that biotin supplements enhance hair growth, thickness, or overall hair health. The widespread use of biotin for hair support is largely driven by anecdotal reports and marketing rather than robust scientific validation. Major dermatology and medical organizations generally do not recommend biotin supplementation for hair health unless a deficiency is diagnosed.

In summary, while there is a scientific basis for using biotin to address hair problems in cases of deficiency, evidence supporting its benefit in the general population for hair support is weak (rated 2/5).

More about Vitamin B7 (biotin)
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Other body systems supported by Vitamin B7 (biotin)

Hair
Nails
Skin

Products containing Vitamin B7 (biotin)

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