Pleurotus-MRL also called Pleurotus osteratus usually grows abundantly in a descending and gradual arrangement in the form of clusters on wood from living or dead trees. Pleurotus-MRL powder contains both mycelium and primordia (young fruit body) grown on a biomass that is grown on a sterilized substrate (autoclave) in California. The tablets are certified according to ISO 22000:2018.