Question

the chelating ligand used to remove excess of Copper and iron in Chelate therapy is

Answer 1

Chelate Therapy is the use of chelating agents to remove excessive amounts of heavy metals in the human body, often as a result of poisoning. Chelating agents are ligands that react with the metal ion to form complexes that can easily dissolve in water, and hence removed. 
Some of the chelating ligands used in chelate therapy are:
Dimercaptosuccinic acid (DMSA) - Pb, Hg, As
D- Penicillamine- Cu
Deferoxamine and deferasirox- Fe