Reishi has long been used as a tonic to help increase energy, improve digestion and sleep, strengthen resistance to disease, and regulate the immune system. It is widely used to improve the cardiovascular system, lower blood lipid, and treat coronary heart disease. Chinese and Japanese doctors routinely prescribe Reishi for memory loss, insomnia, hyperlipidemia, angina, chronic bronchitis, and a whole range of degenerative diseases of the elderly, including disorders associated with senility. Reishi powder can be used to make either a tea or a tincture.