S.W.
There is no scientific support for chelation therapy as a treatment for autism. This treatment is unethical for medical professionals to use and dangerous for their patients.
The only valid medical use for this treatment is for people known to have heavy metal poisoning. The side effects include: A burning sensation at the site of delivery into the vein is common, fever, headache, nausea, stomach upset, vomiting, convulsions, bone marrow depression, hypotension, cardiac arrhythmias, respiratory arrest, and hypocalcemia. Other concerns include kidney failure, which can require permanent life-limiting and expensive dialysis, or cause death. 30 deaths have been recorded, including several children.