A natural source of critical nutrients to help improve joint stiffness and pain in dogs. Provides multiple chondroprotective agents with anti-inflammatories, building - block molecules, and antioxidants. Contains high contents of Glucosamine, omega-3-fatty acids, sulfur, amino acids, vitamin E, & selenium. Ingredients are obtained from natural sources to deliver optimum nutritional benefits. Delivers long-term improvements. The manufacturer has improved Cartiflex and replaced it with PALAFLEX.