Dietary Supplement. Critical to the formation of healthy connective tissue and proper joint function* Health & longevity through the healing power of nature - that s what it means to Trust the Leaf®. Methylsulfonylmethane is a natural sulfur compound critical to the formation of healthy connective tissues and proper joint function.* OptiMSM® is the pure and patented form of MSM. Excipient Free.No excipients or fillers. Nature s Way MSM contains no artificial ingredients, preservatives, yeast, milk, lactose, wheat, sugar or corn. Questions? Call 1-800-9NATURE or visit naturesway.com. Our MSM is carefully tested and produced to certified quality standards. Satisfaction Guaranteed. Freshness & safety sealed with printed outer shrink-wrap and printed inner seal. *These statement.