One product could not be approved because its labeling could confuse a consumer as to the part of reishi it contains (see What CL Found). What did CL's tests of reishi mushroom supplements show? Our tests found that although all of the products were confirmed to contain reishi, amounts of 1,3-beta-D-glucan per serving ranged widely from just a few milligrams to over 250 mg, and the cost to obtain 100 mg of 1,3-beta-D-glucan ranged from just 7 cents to $19! Ganoderic acids also ranged widely.More research is needed to confirm these effects (see What It Does). However, the evidence supporting these effects is based on small, short-term studies. What are the health benefits of reishi? Reishi supplements made from fruiting body are commonly promoted for "strengthening" the immune system, as well as for lowering blood sugar, improving cardiovascular function, protecting from liver damage and reducing cancerous tumors.Extracts are also available in which these compounds are more concentrated than in whole dried reishi (see What It Is). Compounds in reishi thought to be biologically active are 1,3-beta-D-glucan, which is found in both the fruiting body and mycelia, and ganoderic acids, different sets of which are found in the fruiting body as compared to the mycelia. Reishi supplements, commonly sold as capsules or powders, contain material from the dried fruiting body (the top or "mushroom") with or without material from mycelia (the branch-like network that gives rise to the fruiting body). What is reishi? Reishi ( Ganoderma lucidum) is an edible mushroom.
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