As we saw earlier, such a lifestyle creates a tendency for the blood pH to shift slightly toward acidic, resulting in calcium being pulled from the bones to buffer the acid in the blood, leading to excess loss of calcium through the urine. And you are still likely to remain at risk for osteoporosis. In the United Kingdom, for example, the recommended daily calcium intake for children ranges from 350 to 1,000 milligrams depending on age, and the recommended amount for adults is 700 milligrams. The World Health Organization recommends a daily intake of 500 milligrams for children and 800 milligrams for adults. These latter figures may be more appropriate for Americans who choose a healthier lifestyle.
Limestone is the cheapest form of calcium available.
It is effective at neutralizing stomach acid but it is an inferior source of calcium since it is not absorbed as well as most other forms. Furthermore, because of the danger of a rebound effect from taking too many antacids, which can make a stomach problem worse, antacids should never be taken on a continual basis. Tums is therefore not a good source of calcium. Tums also does not contain Vitamin D, which is necessary for calcium absorption and enhances the bone building process. It also does not contain magnesium, phosphorus and boron, which are necessary for healthy bone.