To keep your son's pathways clear, keep his diet clean of wheat and corn for sure. Also, if possible, keep it clean of mono-sodium glutamate. That is tough because there are many ingredients that contain Mono-Sodium-Glutamat (Natrium Glutamat) (natural flavoring, artificial flavoring, etc). To support his body during chelation make sure that he is getting a normal amount of zinc, vitamin E, and magnesium. And also a good amount of vitamin c. I would look into the Andy Cutler method as well because it is important to dose a chelator correctly. I am high functioning autistic and I use the Andy Cutler method. Before this I eating cilantro and became very sick. It turns out that cilantro is also a chelator and that there is no known way to dose it correctly. The Cutler method teaches about dosing.