All forms of vitamin C share one common characteristic – in dissolved form, they have a positively charged cation and a negatively charged anion. Ascorbic acid, for example, is a hydrogen ion with an ascorbate anion, sodium ascorbate is a sodium ion with an ascorbate anion, calcium ascorbate is a calcium ion with an ascorbate anion, etc. It is now obvious that all forms of vitamin C have an ascorbate anion.
Mineral ascorbates are the most commonly used forms of vitamin C, and calcium ascorbate is one of the most popular. It is also marketed as an "ester" or "buffered" form of vitamin C.
The popularity of calcium ascorbate is due to the fact that this form, in addition to being a source of vitamin C, also supplies calcium, with approximately 100 mg of calcium for every 800 to 900 mg of ascorbate.
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