VC 有很多種化學存在形式，並非隻有非結合態的酸一種形態。事實上水溶性的酸和鹽在溶液裏是一樣的，呈現的是酸根離子

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  1. E300 ascorbic acid (approved for use as a food additive in the EU,[109] U.S.[110] and Australia and New Zealand)[111]
  2. E301 sodium ascorbate (approved for use as a food additive in the EU,[109] U.S.[112] and Australia and New Zealand)[111]
  3. E302 calcium ascorbate (approved for use as a food additive in the EU,[109] U.S.[110] and Australia and New Zealand)[111]
  4. E303 potassium ascorbate (approved in Australia and New Zealand,[111] but not in U.S.)
  5. E304 fatty acid esters of ascorbic acid such as ascorbyl palmitate (approved for use as a food additive in the EU,[109] U.S.[110] and Australia and New Zealand)[111]

The stereoisomers of Vitamin C have a similar effect in food despite their lack of efficacy in humans. They include erythorbic acid and its sodium salt (E315, E316).[109]