Evidence supporting the use of: Brewer's Yeast
For the health condition: Nervous Exhaustion

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Synopsis

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

Brewer’s yeast has a long history of use in traditional medicine, particularly in European herbalism, as a tonic for “nervous exhaustion” — a historical term broadly referring to fatigue, stress, and depletion of nervous energy. The rationale behind its use lies in its rich content of B-vitamins (especially B1, B2, B3, B5, B6, B7, and B9), proteins, and minerals, which are believed to support the nervous system and improve energy levels. In traditional practice, brewer’s yeast was recommended for conditions associated with overwork, anxiety, and convalescence, with the assumption that nutritional support could help restore vitality.

However, scientific evidence specifically supporting brewer’s yeast for “nervous exhaustion” is limited. While B-vitamins are essential for nerve health and energy metabolism, and deficiencies can contribute to symptoms like fatigue and irritability, controlled trials demonstrating the efficacy of brewer’s yeast supplements for nervous exhaustion per se are lacking. Most modern research focuses on brewer’s yeast in the context of general nutrition, immune support, or as a probiotic. Therefore, while there is a plausible nutritional foundation and a strong tradition of use, the evidence for its effectiveness in treating or supporting “nervous exhaustion” is weak and not directly validated by contemporary clinical studies.

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