The tree fungus known as reishi has a long history of use in China and Japan as a semi-magical healing herb. More revered than ginseng and, up until recently, more rare, many stories tell of people with severe illnesses journeying immense distances to find it. Presently, reishi is artificially cultivated and widely available in stores that sell herb products.
The usual dosage of reishi is 2 g to 6 g per day of raw fungus, or an equivalent dosage of concentrated extract, taken with meals. In traditional Chinese medicine, reishi is often combined with related fungi, such as shiitake, hoelen, or polyporus. It is often taken continually for its presumed overall health benefits.