Product details zipvit combines premium glucosamine with the finest marine sourced chondroitin glucosamine occurs naturally in the body where it plays a role in the smooth working of joints and helps maintain connective tissues of equal importance is chondroitin sulphate it is important to note that we only use 90 marine chondroitin sourced exclusively from fish many companies use low strength and far cheaper 20 strength chondroitin sourced from the cartilage of cattle we do not believe