Science-Based Nutrition Helps Support Joint Health Dietary Supplement Non-GMO - Gluten Free Helps Support Joint Comfort and Mobility Helps Support Healthy Immune Response Helps Support Antioxidant Defenses Helps Support Overall Health For Hair, Skin, and Nails Doctor's Best MSM with OptiMSM contains 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.