Research shows that Amino Acid Chelated metals are the most available, best absorbed and most retained of all the mineral forms on the market including complexes and sulfate forms. The specific amino acid used to form the chelate also impacts absorption and retention. Glycine origin chelates are shown to be superior to Methionine based products as shown in this university research study.

Amino acid complexes, proteinates, organic acid chelates and polysaccharide complexes can lose integrity during digestion becoming unstable which compromises availability.