Evidence supporting the use of: Yeast (Brewer's Yeast)
For the body system: Hair

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Table of Contents

Synopsis

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

Brewer's yeast (Saccharomyces cerevisiae) is sometimes used as a dietary supplement to support hair health, primarily due to its rich content of B vitamins, protein, and trace minerals such as selenium and zinc. Scientific evidence supporting its direct effect on hair growth or health is limited but present. Some small clinical studies and observational data suggest that B vitamins—especially biotin (B7), niacin (B3), pantothenic acid (B5), and folic acid (B9)—may play a role in supporting healthy hair by contributing to normal cellular function and keratin production. Brewer's yeast is a natural source of these nutrients, leading to its use in hair supplements. However, high-quality randomized controlled trials specifically linking brewer's yeast supplementation to improved hair growth, reduced hair loss, or overall hair health outcomes are scarce. Most available evidence is indirect, associating nutrient deficiencies with hair problems and noting that brewer's yeast can help address such deficiencies. Some anecdotal and historical use also exists, but the scientific validation is moderate at best. Potential benefits are most likely for individuals with poor dietary intake or deficiencies of B vitamins or minerals, rather than the general population. Overall, while brewer's yeast contains nutrients relevant to hair health, robust scientific evidence directly supporting its efficacy for hair is limited, leading to a modest evidence rating.

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