Magnesium stearate

Magnesium stearate is a chemical compound that is commonly used in the pharmaceutical industry and cosmetics industry. It is a white, waxy powder that is insoluble in water and has a slight, characteristic odor.

Chemical Structure

Magnesium stearate is a salt that results from the reaction of magnesium oxide with stearic acid. It consists of two stearate anions (C18H35O2-) and one magnesium cation (Mg2+). The chemical formula of magnesium stearate is Mg(C18H35O2)2.

Production

Magnesium stearate is produced by the reaction of magnesium oxide with stearic acid. This reaction is typically carried out in an aqueous solution, and the resulting magnesium stearate is then precipitated out of the solution and dried.

Uses

Magnesium stearate is widely used in the pharmaceutical industry as a lubricant in tablet and capsule manufacturing. It prevents the ingredients from sticking to the equipment during the compression of tablets and helps improve the flow of materials in the tablet press.

In the cosmetics industry, magnesium stearate is used as a consistency factor and emulsifier. It gives a creamy texture to cosmetics and helps to bind the ingredients together.

Safety

Magnesium stearate is generally considered safe for use in pharmaceuticals and cosmetics. However, some studies have suggested that it may have a laxative effect if consumed in large amounts. It is also not recommended for people with a sensitivity to magnesium.

See Also

• Stearic acid
• Magnesium oxide
• Pharmaceutical industry
• Cosmetics industry