Noun
reishi (uncountable)
Extract of the bracket fungus (mushroom) (Ganoderma lucidum and sometimes Ganoderma tsugae).
Mushrooms provide a vast array of potential medicinal compounds. Many mushrooms - such as portobello, oyster, reishi and maitake - are well-known for these properties, but the lion's mane mushroom, in particular, has drawn the attention of researchers for its notable nerve-regenerative properties. Paul Stamets
Today, reishi stands out as one the most valuable of all polypore mushrooms in nature for the benefit of our health. Many naturopaths and doctors prefer organically-grown reishi from pristine environments because they are more pure. Paul Stamets