Chelation therapy is a common alternative medicine therapy. See <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chelation_therapy#Use_in_alternative_medicine" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Chelation_therapy#Use_in_alter...</a> .<p>There is very little evidence that those plants are effective. The positive studies I&#x27;ve seen (based on a few hours of looking in PubMed last year) are only in animal tests, and are more suggestive than conclusive.<p>An effective study would also need to show some response curve. Is one leaf of coriander a month good enough, or do I need to eat 200 grams per day to get a 5% decrease in blood lead levels?<p>Chelation therapy, like with EDTA and DMSA, can be effective for heavy metal poisoning, but they have limits and side effects. For example, &quot;From 2003 to 2005, deaths of 3 individuals as a result of cardiac arrest caused by hypocalcemia during chelation therapy with EDTA were reported to the Centers for Disease Control and Prevention&quot; (from Wikipedia) and &quot;The oral chelation test using DMSA may lead to misleading diagnostic advice regarding potential mercury toxicity and can be associated with serious side effects&quot; (from <a href="http:&#x2F;&#x2F;acb.sagepub.com&#x2F;content&#x2F;41&#x2F;3&#x2F;233" rel="nofollow">http:&#x2F;&#x2F;acb.sagepub.com&#x2F;content&#x2F;41&#x2F;3&#x2F;233</a> ).