Beta-glucans, which are a polysaccharide, are the most well researched medically active compound in mushrooms. For this reason, we specifically measure beta-glucan levels on our products. We do not believe in using polysaccharides as a measure of quality as it can be easily doctored using starch. Starch is an alpha-glucan, which is also a polysaccharide.
As an example, mycelium on grain products have been shown to have high levels of starch, which allows them to tout high polysaccharide numbers when in reality they have very low amounts of beta-glucans as the bulk of these polysaccharides are made up of starch. The starch comes from the grain that ends up in the final product.
Read our full article on why polysaccharides are a poor measurement of quality.