Magnesium stearate

Magnesium stearate is a mineral salt formed by combining magnesium and stearic acid, a saturated fatty acid of plant or animal origin. It appears as a fine white powder that is hydrophobic and low-density. In the dietary supplement and pharmaceutical industries, it is primarily used as a lubricant excipient: it facilitates the manufacturing process of tablets and capsules by preventing powders from sticking to production equipment. Its presence in a formula provides no direct nutritional benefit, but it contributes to dosage consistency, stability of dosage forms, and the overall quality of the final product. The amounts incorporated are very low, generally below 1% of the total composition. Magnesium stearate is recognised as safe by European and American health authorities (EFSA, FDA). Its use is governed by strict regulations defining acceptable maximum doses. For individuals wishing to avoid excipients of animal origin, it is advisable to verify that the stearic acid used is derived from a plant source.