Brewer's yeast (Saccharomyces cerevisiae) contains large amounts of tyramine. Tyramine-containing foods may cause dangerously high blood pressure when taken at the same time as agents that have properties similar to monoamine oxidase inhibitor drugs (MAOIs). These include protein foods that have been aged or preserved. Specific examples of foods are anchovies; avocados; bananas; bean curd; beer (alcohol-free or reduced-alcohol); caffeine (large amounts); caviar; champagne; cheeses (particularly aged; processed; or strong varieties); chocolate; dry sausage, salami, or bologna; fava beans; figs; herring (pickled); liver (particularly chicken); meat tenderizers; papaya; protein extracts or powder; raisins; shrimp paste; sour cream; soy sauce; wine (particularly chianti); yeast extracts; and yogurt.
Brewer's yeast may lower blood sugar levels. Caution is advised when using herbs or supplements that may also lower blood sugar. Blood glucose levels may require monitoring, and doses may need adjustment.
Brewer's yeast may also interact with anticancer herbs and supplements, antidepressants, antifungal herbs and supplements, cholesterol-lowering herbs and supplements, chromium, herbs and supplements that affect the immune system, and vitamin D.
You should read product labels, and discuss all therapies with a qualified healthcare provider. Natural Standard information does not constitute medical advice, diagnosis, or treatment.
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