Certified Organic Mushroom Nutraceuticals Grown by Gourmet Mushrooms Certified Organic by Quality Assurance International (QAI). A Pure and Reliable Product Produced & Processed in the USA. ReiShi Powder 50% Ganoderma lucidum (also known as Reishi or Ling Zhi)/50% Lentinula edodes (Shiitake) ReiShi Plus is a formulation of two of the most established nutraceutical mushrooms. Both mushrooms have a long history of use in Traditional Chinese Medicine (TCM). Their legendary effects as an adaptogen and on promoting good health and vitality have been supported by recent studies. 15% off price per bottle for orders of 4 bottles or more!