GLC Canine Hip and Joint Supplement - 180 Capsules GLC 1000 (6 oz) is proud to use only USDA approved and certified pure Chondrotin Sulfate of US origin from bovine trachea: Pharmaceutical grade glucosamine from chitin, sodium ascorbate and manganese proteinate. Each jar contains: 128 grams glucosamine, 39 grams chondroitin sulfate, 11 grams ascorbate and 2 grams of manganese