Magnesium Stearate

Magnesium stearate is the magnesium salt of stearic acid, a long-chain saturated fatty acid, made from vegetable-derived fatty acids. Nustras supplies it as a fine white powder for use as a lubricant, anti-adherent and flow aid in tablet and capsule manufacture.

Magnesium stearate is formulated into tablets as a lubricant against sticking to punches and dies, into capsule fills and powder blends as a flow aid, into supplement, pharmaceutical and food-grade solid-dose products, and into cosmetic pressed powders.

The material is a fine, light, white powder, greasy to the touch and practically insoluble in water, with CAS number 557-04-0, molecular formula C36H70MgO4 and molecular weight 591.2, standardised to specification. Identity is confirmed by infrared spectroscopy and the fatty-acid profile by gas chromatography, assay as magnesium by complexometric titration, and loss on drying, acidity or alkalinity, particle size, heavy-metal and microbial limits are supplied to specification and confirmed on each lot's certificate of analysis.

Nustras supplies magnesium stearate in bulk commercial quantities, in food-grade bags and fibre drums, to manufacturers and formulators internationally, with a certificate of analysis, specification sheet and country-of-origin documentation on every lot. Magnesium stearate is an accepted excipient and food additive in major markets; buyers confirm the grade and permitted use for their application. Contact us for grade, pricing per kilogram and lead time.