Host Defense is the #1 mushroom supplement brand in the United States, founded by world-renowned mycologist Paul Stamets — a leading voice in mushroom research and author of Mycelium Running. All Host Defense mushrooms are grown on certified organic grain in Washington State, then harvested and freeze-dried to preserve the full spectrum of mycelial and fruiting body compounds. Unlike products using only fruiting bodies or only mycelium, Host Defense utilizes both for maximum benefit. Third-party tested and non-GMO verified, their lineup includes MyCommunity, Lion's Mane, Reishi, Chaga, and Stamets 7 — formulas trusted by integrative practitioners and mushroom enthusiasts worldwide.