DescriptionUltimate Immune EnhancerMaitake (Grifola frondosa) has been one of the most prized medicinal mushrooms in traditional Japanese herbology. Maitake Beta-1,3 and Beta-1,6 glucans combined with protein (Proteoglucan) has been identified by modern science as the active ingredient that stimulates immune system. PETfraction has been specially developed for use with pets.Suggested UseGive 1 - 3 drop(s) per 2 pounds body weight per day.Inactive Ingredients: vegetable glycerine, purified waterPETfraction contains 1.1 mg of a standardized Proteoglucan extract (known as Maitake D-Fraction) in a drop. Each bottle contains 820 drops.WarningsStore in cool dry place. Keep out of reach of children.