Cordyceps mushrooms have a history of use in traditional Asian medicine to increase energy and support the immune system. The active constituent cordycepin is thought to have anti-cancer properties. Cordyceps can help with energy levels, endurance, inflammation, sexual function, kidney disease, immunity, heart health, asthma, aging, and diabetes. Cordyceps militaris and Cordyceps sinensis are two common types. For athletes, cordyceps can increase VO2 max, improve fatigue resistance, and boost ATP during exercise. Most athletes take 1-3 grams per day, and cordyceps make a good pre-workout supplement due to anti-inflammatory and antioxidant effects.