Calcium citrate, though it provides less calcium per milligram, is often recommended because it is easier on the stomach than calcium carbonate. The quality of commercial calcium supplement products has been questioned. Studies have found that some supplements do not break down fast enough in a solution similar to stomach acid. If it isn't broken down, the body is unable to absorb the calcium and it is eliminated. Ask your pharmacist before purchasing one.
Stomach acid increases calcium absorption.
Dolomite and bone meal should not be used as supplements since these substances can contain traces of lead. Although lean red meat is an excellent source of iron, there are other iron-containing foods you can include in your diet. Fish, poultry, eggs, dried beans and peas, dried fruits, and enriched and fortified breads and cereals are a few. Iron from animal sources is usually used best by the body. However, eating a food high in vitamin C at the same meal will increase iron absorption from both plant and animal sources.