pure cordyceps Cordyceps Sinensis is one of the oldest Chinese remedies to boost the immune system, fight disease and fatigue, promote more energy, and induce vitality. Cordyceps sinensis is a fungus traditionally grown in China on the bodies of caterpillars but wild Cordyceps are the most expensive herb in the world (Approx. $35,000 per pound). As a result most cordyceps sinensis are now lab grown which has helps ensure the mushrooms are void of potentially harmful microorganisms. Open Doors Nutrition Cordyceps is 100% organic.