Reishi grows throughout the world, primarily on hardwood trees. Used for more than two millennia in Asia, Reishi has been respectfully ed “The Mushroom of Immortality”. It’s well known for supporting overall wellness and vitality.* Our supplements are made with organic mushroom mycelium grown on an organic brown rice substrate on our farm in the USA. We never use any fillers! Our mycelium and the fermented brown rice it’s grown on are immunologiy active.* Host Defense was founded by renowned mycologist Paul Stamets. Backed by Paul’s 40 years of experience in mycology, we specialize in mushroom mycelium-based supplements to support natural immunity and whole body wellness. Scientifiy validated to ensure quality and safety.