The amount of elemental calcium is the number to use. During digestion, the elemental calcium is released
from the compound (carbonate, citrate) and becomes available for absorption. Calcium carbonate
provides 40 percent elemental calcium; the other 60 percent is the carbonate ingredient. Therefore,
600 milligrams (mg) of calcium carbonate provides 240 mg elemental calcium. Calcium citrate is
20 percent elemental calcium; 600 mg of calcium citrate provides 120 mg elemental calcium. The
number that is part of the brandname (such as Caltrate 600, Os-Cal 500 and TUMS 500 Extra
Strength) usually indicates the amount of elemental calcium in each tablet or pill. But you should
read the label to be certain.
Supplement Reviews is an Australian-based online review site run by fitness and nutrition enthusiasts with a combined 25 years experience in the fitness and supplement industry. Supplement Reviews exists to provide up-to-date reviews and news pertaining to all things sports and nutritional supplements. Rather than just reviewing popular US supplement brands, Supplement Reviews provides comprehensive reviews and updates on all the big name Australian brands such as Maxs, Probiotec, International Protein, Musashi and Body Science, to name but a few.