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Purina Pro Plan Veterinary Diets FortiFlora Feline Probiotic Supplement contains a safe and effective strain of beneficial bacteria proven to promote normal intestinal microflora. FortiFlora is the #1 probiotic brand prescribed by veterinarians. The science behind our therapeutic products represents a collaboration between Purina nutritionists, researchers and veterinarians. Millward Brown Veterinary Tracker, 2016Purina Pro Plan Veterinary Diets FortiFlora Canine Probiotic Supplement contains a safe and effective strain of beneficial bacteria proven to promote normal intestinal microflora. FortiFlora is the #1 probiotic brand prescribed by veterinarians. The science behind our therapeutic products represents a collaboration between Purina nutritionists, researchers and veterinarians.