EDTA removes all metals. It's simply a compound that forms water-soluble complexes with metal ions, removing them from the body.

The way idiots kill their children with it is that among other metals, it removes calcium ions, and those are necessary for life, with low enough concentration in blood eventually resulting in cardiac arrest.

So said idiots have an autistic child, read junk online that tells them that "toxins" caused this, find the compound that is legitimately used to remove toxins, and administer enough to end the autism. By stopping their child's heart.

I don't particularly like the FDA, but restricting the availability of EDTA is not something I'd criticize.