Ingredient Evidence

Yes, there is human research on probiotics, but the answer depends on the exact strain, dose, person and outcome. Probiotics are live microorganisms; studies report findings for particular uses, …

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Bacopa monnieri, also called brahmi, has more human research on memory and attention than on any other use, and the strongest of that research points to a measurable effect on some memory tests in …

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No use of maca is proven to work. Maca is a Peruvian plant related to the cabbage family, sold as powder, capsules and tablets. Human studies are few and small: two systematic reviews call the …

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Cordyceps is a fungus used in traditional Chinese medicine and sold as capsules, powders and liquid extracts. Human studies on it are small and mixed: the largest pooled analyses tested it added to …

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Chaga is a fungus that grows on birch trees in cold climates, and most people drink it as a tea because of its bitter taste. Memorial Sloan Kettering's chaga page says the safety and efficacy of chaga …

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Horny goat weed is the common name for plants in the Epimedium genus, and its main active compound is icariin. The human studies are mostly about bone: two systematic reviews of Epimedium in primary …

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