Dietary supplement that helps to stimulate the immune system. Blazei-MRL is derived from a master strain of Agaricus blazei. The powder contains both the mycelium and the primordial mushroom (the fruiting body or young carpophore), grown in California, USA. This patented cultivation system ensures that the biomass is free from contamination by other fungi or molds, grown to organic standards. It supplies beta-glucans, and three essential enzyme groups, as well as secondary metabolites that are essential to support the immune system.