Potassium ascorbate

Potassium ascorbate (CAS 15421-15-5), also known by its food additive designation E303, is the potassium salt form of vitamin C used as an antioxidant and preservative across food, pharmaceutical, and agricultural applications.

Unlike ascorbic acid, it delivers vitamin C activity in a neutralized, lower-acidity form suited to pH-sensitive formulations. In food and beverage manufacturing, it protects against oxidative degradation in products where acidic ingredients are undesirable.

This includes certain dairy-based and neutral-pH formulations. Pharmaceutical manufacturers use it as a vitamin C source in effervescent tablets, oral solutions, and dietary supplements targeting consumers who require a gentler gastric profile.

In agriculture and animal feed, it functions as a stabilized antioxidant nutrient added to premixes and feed concentrates. This supports animal health during production stress and ensures the stability of the nutritional profile over time.

Cosmetic and nutraceutical formulators also incorporate it into topical and ingestible products where combined potassium and ascorbate delivery is a formulation objective. It is supplied as a white crystalline powder or granule.

Food-grade material conforming to E303 specifications is the most commonly traded form. Pharmaceutical-grade material is also available to USP and Ph. Eur. standards to meet strict regulatory requirements for global distribution.

Bulk quantities are typically offered in 25 kg bags or fiber drums to ensure safe transport and storage. This versatile chemical remains a staple for manufacturers seeking a stable, non-acidic source of essential vitamin C.