- Customer Reviews (0)
Our OptiMSM in flake form is 99.9% pure and made in the US. Our one-pound plastic pouches are sized so that you get a full pound of MSM. Orders of 5 pounds or more of bulk MSM will be in shipped in larger plastic pouches with a heat seal across the open end to keep it from bursting open during shipment. 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..