Brewer's yeast has been explored as a dietary supplement for athletic performance and exercise support, primarily due to its rich content of B vitamins, protein, and minerals such as chromium and selenium. B vitamins are essential for energy metabolism, which is crucial during physical activity. Brewer's yeast is also a source of beta-glucans, compounds that may support immune function, which can be relevant for athletes under physical stress.

However, scientific evidence supporting Brewer's yeast as a direct enhancer of athletic performance is limited. Some small studies and animal research suggest potential benefits for energy levels and recovery, but robust, well-controlled clinical trials in humans are lacking. The majority of evidence comes from its established nutritional profile rather than direct performance outcomes. As a nutrient-dense food, it may help address deficiencies that could indirectly impair performance, particularly in populations at risk for low B vitamin intake.

In summary, while Brewer's yeast is scientifically recognized as a source of nutrients important for overall health and theoretically beneficial for physically active individuals, there is insufficient high-quality evidence to support its use as a specific athletic or exercise aid. Its use is more justified as a general nutritional supplement than as a targeted ergogenic aid.