Product description:

White powder or crystals. Dietary factor that must be present in the diet of man to prevent scurvy. It cures scurvy and increases resistance to infection. Calcium Ascorbate acts as an oxidation-reduction catalyst in the cell. Natural juice forms should not be exposed to air for more than a few minutes before use.

What does Calcium Ascorbate do?

Principally by treating a saturated solution of soda ash with carbon dioxide. Main use is dietary use. Calcium Ascorbate is simply Ascorbic acid with calcium attached. 1 gram has 900mg of Ascorbic Acid and 100mg of Calcium.
Overall an easier form of vitamin C to consume.