Mushroom Compadres publishes The Mushroom Index, a quarterly open dataset on search demand, published research and EU regulatory status across functional mushroom species. Image supplied by Mushroom CompadresSame name on the label, different material in the bagA mushroom is one stage in the life of a fungus. When conditions are right, that mycelium produces a fruiting body, which is the mushroom as most people picture it. Reishi mycelium samples ranged from 1.06% to 7.3% beta-glucan, with starch between 45% and 51%. Image supplied by Mushroom CompadresHow grain becomes a potency claimThe metric the industry still quotes is total polysaccharides.