What is difference between sodium ascorbate and calcium ascorbate vitamin c powder?

Both are sources of Vitamin C, as the vitamin part is the ascorbate. However, there are significant differences between the sodium and the calcium parts. Sodium can cause heart and kidney problems if taken in large amounts over a long period of time, which is why many Americans have been advised to cut their salt (sodium) intake. Calcium doesn't have many known problems associated with taking too much, so it may be a better option.