I know there are different kinds of calcium supplements, whats the difference?
The majority of calcium supplements are made from calcium carbonate or calcium citrate. Calcium carbonate is most effective when taken with food, and seems to have a greater tendency to cause gas and bloating. Calcium citrate supplements such as Citracal® can be taken any time, with or without food, and usually do not cause gas or bloating. Calcium citrate may also be a better choice for people with lower stomach acid and those who take antacids, H2 Blockers, or Proton Pump Inhibitors, as calcium citrate supplements have high absorption that does not require stomach acid.