Beta-Glucan SerumA recovery serum, Beta Glucan is ideal for those with impaired barriers or in need of special post care. Beta Glucan is a natural polymer derived from Shiitake mushrooms and is known to boost epidermal cell growth while increasing collagen and elastin synthesis. This serum contains high concentrations that help soothe irritated skin, increase moisture levels and reduce erythema. The Beta Glucan comes directly from the cell walls of the mushrooms. It