Calcium Supplements Types of calcium supplement vary a great deal. There are problems with this calcium supplement in large amounts over a long period of time. Calcium carbonate is an antacid which reduces stomach acidity and may interfere with the digestion of food. It blocks its own absorption. It may be poorly absorbed, and bind other minerals and vitamins.
Excess calcium is likely to appear as kidney or gall-bladder stones.
More soluble calcium compounds are better, but are usually more expensive. Calcium citrate is not soluble. Calcium glycerophosphate is the most soluble compound and is used in Alpha OMX and Alpha VMX . Calcium intake recommendations, to be realistic and effective will have to take into account the type of calcium chosen and the variables of absorption in each individual. Calcium absorption from GI tract is regulated by vitamin D and parathyroid hormones.