Zinc yeast is used to support hair health primarily due to the essential role of zinc in cellular processes relevant to hair growth and maintenance. Zinc is a vital trace element that contributes to DNA synthesis, cell division, and protein synthesis, all of which are fundamental for healthy hair follicles. Several studies have shown that zinc deficiency can lead to hair loss, including telogen effluvium and, in some cases, alopecia areata. Supplementation with zinc, often in bioavailable forms such as zinc yeast, has been reported to improve hair growth in zinc-deficient individuals. Zinc yeast is a natural, food-based form of zinc where zinc is incorporated into yeast cells, potentially increasing absorption and reducing gastrointestinal discomfort compared to inorganic zinc salts.

However, direct evidence for zinc yeast specifically (as opposed to other zinc compounds) in promoting hair health is limited, and most clinical studies focus on zinc in general. While zinc supplementation can help address hair loss due to deficiency, there is less evidence supporting its benefit in individuals with adequate zinc levels. Excessive zinc intake may even disrupt copper status and negatively impact health. Overall, the scientific evidence supports the use of zinc (including zinc yeast) for hair health in the context of deficiency, but routine supplementation for the general population is not strongly substantiated.