PC NetwoRx Pure OptiMSM Small Flakes Made in USA (3 Pound)

What the brand says

3 Pounds of 99.9% Pure Bulk OptiMSM Small Flakes in one large stand-up pouch. Our OptiMSM in flake form is 99.9% pure and made in the US. 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. OptiMSM is manufactured in Washington by Bergstrom Nutrition (formerly Cardinal Nutrition) at a facility that Bergstrom owns and is dedicated only for making MSM. Their plant is NNFA GMP certified.