Cordyceps militaris, a parasitic fungus, is a valuable source of many phytonutrients (plant chemicals) and is thought to provide an array of therapeutic benefits and support good health. Cordyceps sinensis has been widely used for centuries in Asian countries as a medicine and a health supplement. It has become more prominent in the US in the past few years. It has many functions:enhancing and strengthening of the immune system; increasing libido by stimulating the production of sex hormones; building muscles and improving physical performance; providing anti-aging and fatigue reducing effects; improving the respiratory function; enhancing cellular oxygen uptake; benefiting the vascular system; protecting liver and kidneys.