Dietary SupplementJarrow Formulas OptiMSM -Methyl-sulfonyl-Methane (MSM) is an organic source of bioavailable sulfur an important component of joint cartilage and other body tissues such as the skin.*The product helps maintain the integrity and elasticity of normal tissues.* OptiMSM is a registered trademark of Cardinal Associates Inc.Suitable for vegetarians/vegans.Other products from HerbsPro