Aspartic acid calcium (Calcium L-aspartate) is a chelate where calcium is attached to an amino acid naming L-Aspartic acid. L-Aspartic acid is an amino acid and serves as a building block for proteins in the body. In Vitro: L-aspartic acid (L-Aspartate) is the L isomer of the aspartic acid, is one of twenty three proteinogenic amino acids. L-aspartic acid is directly incorporated into proteins.