Calcium Supplements: You need to know the truth! -Thursday, June 21, 2012 A human adult requires between 15 and 30mg of food calcium per day. So why are people taking 1000mg of chalk (calcium carbonate)? Although numerous calcium salts are used worldwide, as people become more aware of conditions like osteoporosis, and the diminishing nutritional value of the average diet, the bioavailability of these products remains poor, and unsuited to human consumption. Certain salts are incompatible with many commonly used drugs. They are also associated with several uncomfortable side effects and some require to be taken with food to enable any absorption at all. It therefore makes sense to take a Calcium supplement within a food complex (foodstate) to increase Ca absorption rates, improve bioavailability, minimize side effects, and avoid incompatibilities. This also means there will be no harsh salts for the body to eliminate.