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    We submitted samples to this study and all of our reishi extract samples passed the United States Pharmacopeia’s tests. 74% of samples in this study failed USP’s testing.

    One must be very careful when selecting any kind of medicinal mushroom product as many products do not contain mushrooms and contain high amounts of starch-like polysaccharides like this study showed. These starch-like polysaccharides may be fillers like dextrose or maltodextrin or even grain in the case of many US grown mycelium on grain products.