Cordygen-VO2 has been overhauled into the super effective Cordygen-VO2 ULTRA! We have amped up the product with our most powerful strain of Cordyceps yet called OxyCeps-ATP. Cordygen-VO2 ULTRA is now much more effective and easier on the stomach for those who had any sensitivity. The upgrade makes Cordygen-VO2 ULTRA easier to stack with CRE-02, Citruvol-XS or Cordygen5. You Cordygen-VO2 junkies are going to love this stuff!