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Iron chelate, also known as chelated iron, is a soluble complex of iron, sodium and a chelating agent such as ethylenediaminetetraacetate (EDTA), EDDHA, or others, used to make the iron soluble in water and, for the purposes of agriculture, accessible to plants.
The hydrochloride salt of triethylenetetramine, referred to as trientine hydrochloride, is a chelating agent, and is used to bind up and remove copper in the body to treat Wilson's disease, particularly in those who are intolerant to penicillamine.