premium 90% grade material not the 20% used by others, bovine sourced chondroitin rather than from endangered shark species we use a well-regulated highly refined material, made to gmp standards & usp standardschondroitin a compound found naturally in the body helps to attract fluid into the cartilage the tough protein that lines the surfaces of bones. chondroitin is an expensive nutrient & you have to read labels carefully to check the amount of chondroitin that is present in a product. at nature’s best we insist on a premium 90% grade material for our chondroitin (many companies are still using a low grade 20% material). happily this highly concentrated form means that each of our tablets contains a relevant level at 540mg. chondroitin is typically sourced from shark species but we’re not entirely satisfied that this is a renewable resource. so to save our shark species we’ve chosen to use bovine chondroitin for all our chondroitin supplements as this is simply a by-product of the beef industry & a well-regulated high quality material.//b 250