Host Defense, Reishi Mushroom Mycelium Powder, 100 GProduct Description Used for more than two millennia in Asia, Reishi (Ganoderma lucidum s. l.) has been respectfully called the ? mushroom of immortality.? Reishi grows throughout the world, primarily on hardwood trees, and is well known for supporting general wellness and vitality.* Product Benefits Made from freeze dried activated mushroom mycelium. Reishi is the #1 selling nutraceutical mushroom species worldwide. Promotes cardiovascular system