- Customer Reviews (0)
Our OptiMSM in flake form is 99.9% pure and made in the US. OptiMSM uses distillation for its purification process which is considered to be superior to the double crystallization method used by our imported MSM suppliers. Our one-pound plastic pouches are sized so that you get a full pound of MSM. We add nothing to our MSM. Shelf-life of the OptiMSM® is certified to be 5 years from the date of manufacture which is just a few months before we get it into our stock. MSM should be stored in a cool, but not cold, dry area, such as on a kitchen shelf..