wrote:

Calcium Ascorbate. Buffered. Cheap. Longer shelf life

Or Ester-C. Slow release. Expensive.

Given the choice of cheap or expensive, I'd go with cheap.

Om mentioned getting the runs. It's a way to tell your
dosage is too high. To find your maximum dosage keep adding
in 500 mg increments until you get the runs then back off
a couple. It is by no means certain that the maximum
dosage is the best.