Magnesium stearate (Mg(C18H3502)2 or octadecanoic acid) is a solid, white powder at room temperature. It is a FDA-approved inactive ingredient commonly used in the pharmaceutical industry as a diluent for the manufacture of tablet, capsule, and powder dosage forms.
Magnesium stearate is generally recognized as safe by the FDA. Magnesium stearate exists as a salt form and is useful for it’s lubricating properties for capsules and tablets in industry. It is used to help prevent pharmaceutical ingredients from adhering to industry equipment. Magnesium stearate may be derived from both plant and animal sources.