Vita Flex MSM is ultra pure methylsulfonylmethane, a naturally occurring dietary source of bioavailable sulfur, an essential mineral for both large and small animals. MSM is a form of organic sulfur found in all living organisms and is the primary metabolite of DMSO (dimethylsulfoxide). Since 1988 horsemen and pet owners have relied on the quality and value of Vita Flex MSM to deliver the benefits of this unique ingredient.