Grifron� PETfraction� is a veterinary version of Grifron�-Pro Maitake D-Fraction� with purified and standardized "active proteoglucan" from Maitake mushroom (Grifola frondosa) with professional strength. The active proteoglucan, often referred to as D-fraction by scientists, is a unique beta-glucan conjugated with protein, which has been identified and isolated as a responsible substance for potent immune-activating property of Maitake mushroom.* The active proteoglucan has been the subject of m

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