Antibiotic, Hormone Free USA Bovine Trachea. - An excellent, natural source of Glucosamine and Chondroiten Sulphate in it’s natural state, retaining it’s natural GAG’s (glycosaminoglycans) making it easily and naturally absorbed and assimilated by the body. - Bioavailability, 100% natural, 100% USA. - An amazing tasty natural chew that supports joint, dental and mental health.