Equi-Flex MSM (methylsulfonylmethane) is an organic compound that comes in the form of a white crystalline powder. It is derived from DMSO (dimethylsulfoxide) a topical anti-inflammatory agent originally produced as a by-product of the wood-pulp and paper industry. MSM is a natural sulfur nutrient found in all living organisms. MSM originates in the ocean and reaches the food chain through rainfall. It is the prime source of bio-available sulfur found in most vegetables, fruits and grains. Unfortunately, due to its volatile nature most of it is lost during the processing of feeds or drying of hay