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Mushroom Supplements
Functional mushrooms have moved from fringe to mainstream, but the human evidence is thinner than the marketing. Lion's Mane's nerve-growth-factor story is largely preclinical, and its one controlled trial gave 3 g a day to 30 adults with mild cognitive impairment; Reishi's best placebo-controlled trial used 5.4 g a day of a polysaccharide extract in people with neurasthenia, and a Cochrane review found no benefit for blood sugar, blood pressure or cholesterol in people with type 2 diabetes. We review mushroom supplement brands against what those trials actually used.
The single biggest difference between products in this category is not the species on the front of the tub. It is whether you are buying fruiting body or mycelium grown on grain. Mycelium-on-grain products are cheaper to produce and the finished powder contains a substantial proportion of the grain substrate, which is why a label may report a high polysaccharide figure while containing comparatively little of the compound anyone is actually interested in.
That is the check worth learning. Polysaccharide content includes starch from the grain; beta-glucan content does not. A brand confident in its raw material tends to state beta-glucan specifically, name the part of the organism used, give an extraction ratio, and publish third-party certificates of analysis by batch. A brand that reports only a proprietary blend and a polysaccharide percentage has told you almost nothing you can verify, whatever the species listed.
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