VetriScience - Joint Supplements for Dogs - Vetri Disc Capsules - 180CAPSVetriScience Laboratories Vetri Disc combines bovine tracheal cartilage with amino acids, mineral sulfates, vitamins, pepsin, and natural silicon sources all necessary for the support and maintenance of connective tissue. Bovine tracheal cartilage is a rich source of chondroitin sulfates which make up the connective tissue matrix and are found in an especially high concentration in the spinal and invertebrate disc tissues. Other ingredients like