The trademark name of a patented non-acidic form of vitamin C. The makers claim that ester-C® is absorbed faster and retained more readily than ordinary vitamin C due to the addition of vitamin C metabolites. It is used in cosmetic formulations where it purports to deliver the collagen and antioxidant benefits of vitamin C with far higher stability and penetrability. There is little independent data substantiating these claims and it is argued that the best form of vitamin C is that which is naturally synthesised by animals. See ascorbic acid.

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