What is Doctor’s Best Ultra Cordyceps? Doctor’s Best Ultra Cordyceps is an herb that help improve vitality, support energy & stamina, and supports lung and liver health. It contains Cordyceps sinensis, an herb used for centuries in China as a vitalizing tonic that improves energy and benefits the function of various organs and systems. Ultra Cordyceps contains a strain of cultivated Cordyceps mycelia standardized by HPLC for consistent potency. It contains a minimum level of 8% cordycepic acid (D-mannitol), an important bioactive compound. How does it work? Ultra Cordyceps contains a strain of pure cultivated Cordyceps sinensis is very similar to the wild strain of Cordyceps sinensis. Highly valued in China as a food and tonic, wild Cordyceps is an exotic fungal complex found at very high altitudes in a mountainous region of China known as the Qinghai-Tibetan Highlands. Ultra Cordyceps contains a strain of cultivated Cordyceps mycelia standardized by HPLC for consistent potency. It contains a minimum level of 8% cordycepic acid (D-mannitol), an important bioactive compound. In addition to cordycepic acid, biochemical analysis of Cordyceps sinensis has revealed many other active constituents: polysaccharides, nucleosides (including the adenosine derivative cordycepin), sterols, amino acids, and trace elements.