Calcium ascorbate is a compound with the molecular formula CaC12H14O12. It is the calcium salt of ascorbic acid, one of the mineral ascorbates. It is approximately 10% calcium by mass. As a food additive, it has the E number E 302. It is approved for use as a food in the EU, USA and Australia and New Zealand. References Ascorbates Calcium compounds Vitamers Vitamin C E-number additives