- MSM Capsules are filled with a single ingredient, providing a pure undiluted supplement 2. MSM is a natural source of elemental sulfur 3. Always Pure: No additives, stearates, or rice fillers 4. 120 Day Supply: More than 3 months of peak health support 5. Packaged in Utah, USA Methylsulfonylmethane | Msm 365 Capsules