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The concept of chelation is based on the observation that when a certain amino acid complex called EDTA (ethylene-diamine-tetra-acetic acid) comes in contact with certain positively charged metals and other substances such as lead, iron, copper, calcium, magnesium, zinc, plutonium and manganese, it grabs them (hence the chele or claw), and removes them. Chelation therapy is the process of removing from the body the undesirable ionic material by the infusion, or taking orally, of an organic compound which has suitable chelating properties.