Dietary Supplement. Athletic series. Inosine is a nucleoside (a building block for DNA and RNA) found in muscle tissue. Inosine is used by athletes and those who want to improve performance (These statements have not been evaluated by the Food and Drug Administration. this product is not intended to diagnose, treat, cure or prevent any diseases). Suitable for vegetarians. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.