Manal,
I spent about six hours reading what I could find about EDTA. There are many claims out there but there is a big difference between oral EDTA supplements and the IV therapy that is used in cases of lead poisoning. I ignored the claims and sifted through the articles for the small bits of factual information that is out there concerning EDTA chelation therapy. Obviously, this subject has shown enough for the National Institute of Health to justify a many years study of its effect on the heart. This could prove of special interest to thals if it does prove to be beneficial.
Long before I knew anything about thalassemia, I had heard about chelation therapy, and once I learned of iron overload in thals, I wondered why EDTA wasn't used for thals. The drawbacks have so far proven to be too many. The chelation of other minerals and the possibility of severe drops in blood calcium (two children and one adult are known to have died after EDTA therapy), have limited its usefulness. Perhaps with proper supplementation and monitoring, EDTA may some day prove useful.