OSIMAGNESIUM Body Lotion + OptiMSM is a unique formula made of 250 million years old OSIMAGNESIUM Oil, which delivers a large dosage of magnesium into the body by penetrating the skin and OptiMSM. How to use: 5 ml (one teaspoon) contains 130 mg elemental magnesium, 650 mg OptiMSM. Massage into skin. For daily topical use.