There is very little evidence that those plants are effective. The positive studies I've seen (based on a few hours of looking in PubMed last year) are only in animal tests, and are more suggestive than conclusive.
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?
Chelation therapy, like with EDTA and DMSA, can be effective for heavy metal poisoning, but they have limits and side effects. For example, "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" (from Wikipedia) and "The oral chelation test using DMSA may lead to misleading diagnostic advice regarding potential mercury toxicity and can be associated with serious side effects" (from http://acb.sagepub.com/content/41/3/233 ).
There is very little evidence that those plants are effective. The positive studies I've seen (based on a few hours of looking in PubMed last year) are only in animal tests, and are more suggestive than conclusive.
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?
Chelation therapy, like with EDTA and DMSA, can be effective for heavy metal poisoning, but they have limits and side effects. For example, "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" (from Wikipedia) and "The oral chelation test using DMSA may lead to misleading diagnostic advice regarding potential mercury toxicity and can be associated with serious side effects" (from http://acb.sagepub.com/content/41/3/233 ).