Cordyceps sinensis, also known as "caterpillar fungus" or "DongChongXiaCao" (summer plant, winter insect), is one of the most popular remedies in Traditional Chinese Medicine. Originally from the Tibetan plateau, it is very rare and has been very "revered" over the millennia for its chameleonic characteristics and its therapeutic properties. In oriental tradition it is the mushroom of power, it gives strength, resistance and willpower, and helps to regenerate the body after debilitating diseases, bringing energy to body and mind. Cordyceps sinensis is a potent immunostimulant and certainly an excellent recovery medicine, useful in all cases of immune system difficulties. It is considered a powerful tonic and antidepressant and has been proved to be very useful in the treatment of insomnia and stress. It has strong antioxidant properties and protects the body from damage caused by free radicals, especially in the brain. In older people it favours greater vitality, better tolerance to cold and a strengthening of memory. Traditional Chinese Medicine describes the stimulating effect of Cordyceps sinensis on the sexual sphere, which makes it extremely interesting in cases of infertility of hormonal origin, impotence, and exhaustion from stress. It is also capable of improving endurance sports performance, increasing cellular bioenergy (ATP) up to 55%, translating into greater fatigue resistance.