VetriScience Laboratories Glyco-Flex II Bite-Sized Cat Chews The GlycoFlex Joint Support Stages system has been trusted and recommended by veterinarians for over 30 years. All VetriScience products are veterinarian formulated and approved by our veterinary review board. Our soft chews are naturally flavored with real chicken liver and formulated specifically for cats. GlycoFlex 2 includes clinically proven ingredients to build cartilage, support the synovial fluid in the joints and manage irritating inflammation. For cats showing signs of joint discomfort and loss of mobility. VetriScience products are manufactured in the U.S.A