Bluebonnet‚™ MSM 1000 mg Capsules contain patented OptiMSM® methylsulfonylmethane, a non-toxic form of active sulfur. Bluebonnet‚™ MSM is all and tested in our own state-of-the-art laboratory for purity and potency. Available in easy-to-swallow vegetable capsules for maximum assimilation and absorption.