This supplement consists of methylsulfonylmethane, an odorless, virtually tasteless white crystalline powder derived as a metabolite of DMSO. Each 4 lb container is intended for horses and provides a sulfur-based compound commonly fed to support healthy joint function and circulation. The powder is top-dressed onto feed or given during or after mealtime, and a scoop is included to measure servings. A loading period of a larger daily amount for about one week is followed by a smaller daily maintenance amount. The product is manufactured in the United States and is packaged in a plastic bucket or jar for storage. It is formulated for horses of any life stage and does not require mixing or assembly before use.