Now Foods Rei-Shi Shiitake Mushrooms 270mg 100 CapsulesWhat is Now Foods Rei-Shi Shiitake Mushrooms? NOW Rei-Shi Mushrooms is a blend of Reishi (also known as Ling Zhi) and Shiitake Mushrooms. Reishi and Shitake are both well known in Oriental herbalism and have been used to promote health..