MSM supplements, or methylsulfonylmethane supplements, are dietary products that contain a naturally occurring sulfur compound. They are often used to support joint health, reduce inflammation, and alleviate pain. Many people take MSM to help with conditions like arthritis or to improve overall mobility. These supplements are available in various forms, including powders, capsules, and topical creams. While some studies suggest potential benefits, more research is needed to fully understand their effectiveness. It's important to consult a healthcare professional before starting any new supplement regimen, especially for those with existing health conditions or who are pregnant.