Blood levels of mercury and lead were found to be much higher in autistic children as compared to normal controls. Upon chelation, the blood levels of these heavy metals decreased and autistic symptoms improved.
Autism: A form of lead and mercury toxicity
Heba A. Yassa; Environmental Toxicology and Pharmacology, 38 (October 2014), 1016-1024.
The aim of this study is to find out the relation between exposure to Lead and/or mercury as heavy metals and autistic symptoms, dealing with the heavy metals with chelating agents can improve the autistic symptoms. The results obtained showed significant difference among the two groups, there was high level of mercury and lead among those kids with autism. Significant decline in the blood level of lead and mercury with the use of DMSA as a chelating agent. In addition, there was decline in the autistic symptoms with the decrease in the lead and mercury level in blood.