Magnesium stearate is identified by the E number E470b [1]. This designation indicates its status as a food additive permitted for use in the European Union [1][2]. E470b falls under the category of magnesium salts of fatty acids, which are derived from stearic acid [1][3].
What is Magnesium Stearate Used For?
Magnesium stearate is commonly utilized as an anti-caking agent and lubricant in pharmaceutical tablets and capsules [1][4]. It prevents ingredients from adhering to manufacturing equipment during the production process, ensuring consistent dosage and quality [4]. In the food industry, it functions similarly to prevent ingredients from clumping [1][5].
Where Does E470b Come From?
The stearic acid used to produce magnesium stearate can be sourced from both animal and vegetable fats [3][6]. This means the origin of the fatty acids may vary depending on the manufacturer [3].
Is E470b Safe?
Magnesium stearate is generally recognized as safe (GRAS) by regulatory bodies for its intended uses [7]. It has been evaluated and approved for consumption in numerous countries [1][7]. However, concerns have been raised by some individuals regarding its potential impact on nutrient absorption and its presence in supplements [8][9]. Regulatory agencies consider it safe at typical usage levels [7].
What are Alternatives to Magnesium Stearate?
Alternative excipients used in tablet manufacturing include microcrystalline cellulose, stearic acid, and various starches [10]. For food products where anti-caking is needed, alternatives might include silicon dioxide or calcium silicate, depending on the specific application and regulatory approval [5].