Ingredient Evidence

Tongkat ali is the root of Eurycoma longifolia, a slow-growing tree from Southeast Asia that has been used in traditional medicine for centuries. The strongest human evidence is for a rise in total …

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Lion's mane (Hericium erinaceus) is an edible mushroom used in East Asian medicine, and it is sold as capsules, powders and liquid extracts. Human studies are small and mixed: some report modest …

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Turkey tail is a woody bracket fungus, Trametes versicolor, that has been used in traditional Chinese medicine for many years. Most of the human research is on a proprietary extract called PSK, an …

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Reishi (Ganoderma lucidum, also called Lingzhi) has human research behind it, but the studies are small and mixed, so it does not yet prove it works for any one purpose. Most of the best human work is …

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L-tyrosine has some human research behind it for mental performance under stress or heavy mental workload, but it is not shown to work as an ADHD treatment. Your body makes tyrosine from phenylalanine …

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Lutein and zeaxanthin are carotenoids from food that collect in the macula, the small central part of your retina. Human studies show they can increase macular pigment optical density, or MPOD, in …

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