Calcium Carbonate Alternatives
TUMS:  
 Regular:    200 mg of elemental calcium, which is 500 mg calcium carbonate
 Extra-strength:   300 mg of elemental calcium, which is 750 mg calcium carbonate
 Ultra:  400 mg of elemental calcium, which is 1000 mg of calcium carbonate
 TUMS 500 calcium supplement:  500 mg of elemental calcium, which is 1250 mg of 
calcium carbonate  
Caltrate:
 600 mg of calcium, which is 1500 mg of calcium carbonate
Calcium carbonate tablets (made by Roxane):
 500 mg of calcium, which is 1250 mg of calcium carbonate
Calcium carbonate liquid (made by Roxane):
 500 mg of calcium, which is 1250 mg of calcium carbonate per 5 cc (one teaspoon)
Calci-chew (made by R&D Labs; 3 flavors, cherry, lemon, orange):
 500 mg of calcium, which is 1250 mg of calcium carbonate
Calci-mix (capsule that you open a dump out a tasteless powder that you
mix into food or drink (made by R & D Labs):
 500 mg of calcium, which is 1250 mg of calcium carbonate
 website for R&D Labs is www.rndlabs.com  (you or your pharmacist can order from
 them-info on website)
Oscal  500 (not Oscal with D or Oscal 250):
 500 mg of calcium, which is 1250 mg of calcium carbonate