VetriScience Laboratories - GlycoFlex 3, Hip and Joint Supplement for Cats, 60 Bite Sized Chews The Glyco Flex Joint Support Stages system has been trusted and recommended by veterinarians for over 30 years. Glyco Flex has been Clinically proven to increase hind leg strength in 4 weeks Formulated specifically for cats Naturally flavored with real chicken liver Packaging may vary