Daily Nutra-Flex GC is a glucosamine/chondroitin blend using the optimal dosages of vegetarian glucosamine sulfate with a high quality chondroitin sulfate manufactured to USP standards. Nurta-Flex GC also provides 102 mg of vitamin C per day. The efficacy of glucosamine and chondroitin sulfate for bone and joint health has been confirmed in human clinical trials, including a major multi-center study published in the Annals of Rheumatic Diseases (2015). Three capsules provide Glucosamine from non-GMO corn (500 mg), Chondroitin from cartilage (bovine) (400 mg). 90 Vcaps per bottle.