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MSM is an organic form of naturally-occurring sulfur. MSMPure is OptiMSM which is the world’s purest and safest MSM (MethylsulfonylMethane). Our MSM coarse powder flakes goes through a multi-stage distillation process to ensure a 99.9% pure product to guarantee a consistent, high-quality form of MSM. These MSMPure coarse powder flakes are manufactured in a GMP approved facility and 3rd-party tested to the industry's tightest purity specifications. Perfect for dissolving quickly in water, the coarse flakes powder is a great supplement in water, juice, smoothies or shakes to promote joint health. The 1 lb size is roughly a 120 day supply based on taking 4 grams daily. Made in the USA.