Amino acid chelate forms are best for absorption: Better multivitamins have their vitamins and minerals in highly absorbable forms, like amino acid chelates and citrates, rather than sulfates, carbonates or oxides, although these less absorbable forms are still good for many purposes. Amino acid-bound, chelated mineral supplements can provide three to 10 times better assimilation than the non-chelated forms. Check labels for the words “citrate” or “chelate” to ensure you are taking the most absorbable form. Examples include calcium citrate, which is better absorbed than a calcium, and iron citrate because it does not cause constipation.
Acid breaks down the bonds between the calcium element and its bonding partner like carbonate or amino acid chelate. Calcium Carbonate has a carbon bond the strongest bond of its kind; this makes it extremely unwise for those people who are older or suffer from a digestive acid deficiency. The Cheap price of calcium carbonate comes at a a price, poor digestion and absorbability.
While these increased uptakes of iron from the amino acid chelate into mucosal tissue are highly significant, this paper also demonstrates that there is a mechanism in the mucosal tissue which controls the quantity of iron from the amino acid chelate that is transferred to the plasma. For example, the higher the hemoglobin value, the less iron transferred. When considered together these studies demonstrate that iron amino acid chelate is both a safe and effective source of iron for treatment of iron deficiencies.