E572: Magnesium stearate

What is E572?

Magnesium stearate (E572) is the magnesium salt of stearic acid, a saturated fatty acid. It is a soft, white, water-repellent powder with a slippery feel.

Origin and production

It is produced by reacting stearic acid with a magnesium compound. The stearic acid can come from vegetable oils such as palm or cottonseed oil, or from animal fats.

Why is it used?

Its main use is as a lubricant or 'flow agent' in manufacturing tablets and capsules, stopping powders from sticking to machinery. It is therefore very common in dietary supplements and also in compressed sweets, candies and some biscuits.

Vegan, vegetarian and halal

Because the stearic acid may be plant- or animal-derived, suitability for vegans, vegetarians and halal or kosher diets depends on the source, which the manufacturer or certification can confirm.

Safety and regulation

E572 is authorised in the EU and was re-evaluated by EFSA, which did not identify safety concerns at reported uses. It is used in very small amounts.

Common in