Reishi SAP is a hot water-extract from the medicinal reishi mushroom also known by its scientific name Ganoderma lucidum which has been used in Japan for over 2000 years. This mushroom has been used as herbal medicine to help increase energy and resistance to stress. The reishi mushroom has also been used as a liver tonic as well as to support immune function. Reishi has properties that help support a healthy inflammatory response and exerts antioxidant properties.