Potassium ascorbate

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Potassium ascorbate is the potassium salt of vitamin C (ascorbic acid). It’s also known as monopotassium ascorbate or potassium L-ascorbate. Its chemical formula is KC6H7O6 and it is a mineral version of vitamin C.

In foods, it acts as an antioxidant and has the E number E303 (INS 303). Its regulatory status varies by country: it is not permitted as a food additive in the United Kingdom, the United States, or the European Union, but it is approved for use in Australia and New Zealand.

Key properties:
- Molar mass: 214.214 g/mol
- Very soluble in water: about 98 g per 100 mL at 25°C

Some studies have reported strong antioxidant activity and potential anti-tumor effects.