The purest MSM on the market and the ONLY MSM made in the USA. The reason why Kala Health MSM powder is the leading brand is because: our MSM (organic sulphur) is 99.9% pure OptiMSM and made in the USA; Our MSM is the organic form of naturally occurring sulphur and methyl groups; Our MSM flakes are free of any additives and is purified by quadruple distillation. Backed by the Kala Health No-Risk 100% satisfaction guarantee: At Kala Health we stand behind every product we manufacture for our customers. If at any point you do not believe this is the best MSM for you, please simply return the product for a 100% refund, no questions asked. Freedom of joint or muscle discomforts: If you are experiencing joint discomforts, back issues, muscle aches or weakness then MSM is your safest, most natural and best answer. Additional uses: Though the majority of consumers are looking for MSM to relief their joint and muscle discomforts, many people experience the additional, proven benefits including reduced muscle ache after exercise, improved skin, hair and nail health, mental clarity, relief of airborne allergies such as hay fever, or simply the feeling of overall improvement in health and wellness. Try this with our OptiMSM skin and facial gel for optimal skin support!