Cordyceps sinensis has always been considered one of the best tonic products in Chinese medicine. But the extremely high price of the original form has prevented many practitioners and patients from using it regularly. Now, by using the newest scientific method, cultivation of the original mycelium has been successful. Clinical trials have demonstrated that the mycelium gives equal or sometimes better results than the original form. This special strain, known as Paecilomyes hepiali, is the first one approved by the Department of Health in China.