Calcium carbonate or citrate????

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Refined calcium carbonate is the most commonly used form of calcium

in supplements. It is relatively inexpensive compared to chelated

forms of calcium, but has been shown to be less well-absorbed than

other forms. To improve absorption, calcium carbonate should be taken

with meals, as the presence of food in the stomach causes the

secretion of hydrochloric (stomach) acid, a compound that breaks down

calcium carbonate. Chelated calcium is calcium bound to an organic

acid, such as citrate, malate, lactate, or gluconate; or to an amino

acid, such as aspartate. Research indicates that calcium chelates,

especially calcium citrate, are more bioavailable than calcium

carbonate.

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