Magnesium stearate, also called octa decanoic acid, magnesium salt, is a white substance, powder which becomes solid at room temperature. It has the chemical formula Mg(C18H35O2)2. It is a salt containing two equivalents of stearate (the anion of stearic acid) and one magnesium cation (Mg2+).

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Magnesium stearate is a fine white powder widely recognized as the most commonly used "flow agent" and lubricant in the pharmaceutical and nutraceutical industries. Its primary application is in the manufacturing of tablets and capsules, where it prevents ingredients from sticking to the production machinery and ensures uniform consistency in every dose. In the food industry, it serves as an anti-caking agent and emulsifier, helping to maintain the texture and stability of confectioneries and powdered supplements. Beyond consumables, it has significant industrial applications in the plastics and rubber sectors as a mold release agent and heat stabilizer. Its hydrophobic properties also make it an effective water-repellent additive in the production of specialized coatings and construction materials, enhancing their durability and moisture resistance.