For many years, chelation therapy has been used with calcium disodium ethylene diamine tetraacetic acid (EDTA) to treat heavy metal poisoning. It is still an accepted medical therapy for lead toxicity, and several studies report lower levels of lead in the blood and slower progression of kidney failure. Chelation therapy may also be used to treat iron, arsenic, mercury, or cobalt poisoning. However, some research results are mixed. More studies are needed to clarify.
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