Doctor?s Best MSM with OptiMSM? a high quality purified MSM (methylsulfonylmethane) backed by numerous clinical studies for safety and efficacy.* MSM IS a natural sulfur compound that helps support the formation of healthy connective tissues. It also helps support overall joint health mobility and a normal range of motion.* It also may help reduce oxidative damage to support a healthy immune system.* MSM provides the sulfur reputable for being nature?s ?beauty mineral?. Sulfur is a key component of collagen that supports the skin?s structural framework and is also a building block of keratin a structural constituent of hair and nails.* At Doctor?s Best we lead with science. Our products are backed by research and crafted using pure ingredients carefully sourced from around the globe. Since 1990 we have dedicated ourselves to providing highly effective nutritional supplements that enable you to live a healthier lifestyle. We want nothing more than to see you and your family thrive!