E572 - Stéarate de magnésium

Origin

Magnesium stearate is a metallic soap derived from vegetable or animal fats. It consists of magnesium and stearic acid, a saturated fatty acid. While stearic acid can be sourced from animal fats, the magnesium stearate used in food and pharmaceutical applications is typically derived from vegetable oils to ensure wider acceptability and avoid potential concerns related to bovine spongiform encephalopathy (BSE) or religious dietary restrictions. The production process involves reacting magnesium salts with stearic acid.

Usage

In the food industry, magnesium stearate is primarily used as an anti-caking agent, releasing agent, lubricant, and emulsifier. It prevents powdered food ingredients from clumping together, ensuring a free-flowing consistency. It's commonly found in spices, powdered milk, cocoa products, and instant soups. In the pharmaceutical industry, it is widely used as a lubricant in the manufacturing of tablets and capsules, facilitating the smooth flow of powders during compression and preventing sticking to machinery. The typical usage levels in food are relatively low, generally below 1%.

Side Effects

Magnesium stearate is generally considered safe for consumption at the levels typically used in food and pharmaceutical products. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has not established a numerical Acceptable Daily Intake (ADI) for magnesium stearate, indicating its low toxicity. Some studies have suggested potential concerns related to immune system effects at very high doses, but these are not relevant to typical dietary exposure. Some individuals may experience mild gastrointestinal discomfort with very high consumption. However, such levels are unlikely to be reached through normal food or supplement intake. It is considered non-toxic and non-carcinogenic.

Regulatory Status

Magnesium stearate is approved for use as a food additive in many countries, including the United States, the European Union, and Canada. In the EU, it is designated as E572. Regulatory bodies like the European Food Safety Authority (EFSA) and the US Food and Drug Administration (FDA) have evaluated its safety and established guidelines for its use. It is generally recognized as safe (GRAS) by the FDA when used in accordance with good manufacturing practices.