Molecular Formula: Ca(COOCH2NH2)2; Molecular weight (Mw): 188.11 Dalton. Calcium bisglycinate, also known as calcium bisglycinate chelate or calcium glycinate, is a form of calcium supplement that is often used to improve calcium intake and address calcium deficiency in the body. It is a chelated form of calcium, meaning that the calcium ions are bonded to glycine molecules, an amino acid.