David Avocado Wolfe's 24 raw freeze dried medicinal mushroom powder from Longevity Warehouse. The product contains substrate, mycelium, and fruiting body. Costs between 30 to 40 cents per gram depending on quantity. Poor peasants like me and Janet do not purchase that. Instead we like Om consisting of substrate and raw mycelium for the low low price of 15 cents per gram. Medicinal mushrooms grown from China are grown in enclosures where the air and water are filtered. The substrate is organic. They are tested for purity and potency.