Found in many foods such as fruits and vegetables, MSM (methylsulfonylmethane) is believed to be a natural building block for proteins and essential in the development of tissue throughout the body. MSM has had many positive results. MSM, also known as methylsulfonylmethane, is an increasingly popular source of nutritional sulfur. It is believed that MSM is a necessary building block for proteins, particularly those found in muscles, skin, and connective tissue. MSM is a natural organic sulfur compound that can be found in small amounts in everyone's blood, as well as in many foods such as fresh raw produce, but is lost once the food is processed. Now available in a concentrated supplement, it has many health benefits. Opti MSM. Made in the USA. Please NOTE: NWC Naturals Inc. products may NOT be sold on any third-party platform. NO Amazon, Walmart, eBay, Jet, Target, Rakuten and so forth.