Vitamin C Ascorbyl Stearate

Ascorbyl stearate (CAS 10605-09-1), also designated E304ii, is a fat-soluble ester of vitamin C used as an antioxidant in oil-based systems where water-soluble ascorbic acid cannot function effectively.

Where is Vitamin C Ascorbyl Stearate used?

• Food manufacturing: incorporated into fats and oils
• Fat-rich products such as margarine and baked goods: prevents rancidity and color deterioration
• Cosmetics: stabilizes the oil phase in emollients, creams, and serums
• Pharmaceuticals: protects oxidation-sensitive active ingredients in lipid-based drug delivery systems and soft gel capsules
• Nutraceutical oil blends: co-antioxidant alongside tocopherols, improving oxidative stability
• It protects lipid-containing formulations from oxidative degradation, extending shelf life.

Commercial specifications

• Food-grade quality meeting E304ii specifications under EU food additive regulations
• Pharmaceutical-grade quality conforming to USP or Ph. Eur. standards
• Bulk quantities typically offered in fiber drums or multi-layer bags suited for temperature-controlled storage