While its evocative name (meaning "supernatural mushroom") may conjure up images of wild, psychedelic-fueled parties, the reishi mushroom has long been revered for an altogether different kind of magic. A staple in Chinese medicine for over 2,000 years, this luminous, red tree fungus has traditionally been used to calm the mind, ease tension and promote overall health and well-being. Today, practitioners utilize reishi as an adaptogen for its stress-reducing properties, while scientific research has also found the mushroom to be a potent immune potentiator. High in histamine-inhibiting ganoderic acids as well as polysaccharides, which improve the body's immune functions, reishi can help protect against illness and infection when taken regularly. Naturally bitter in taste, reishi is often ingested in capsule form, but can also be taken with tea, coffee or other beverages.