Thank you so much Mary. I am printing out your response so I can keep a checklist going. I truely believe in many of these things and am trying to travel down this road because he also has a brother dx on the autism spectrum. Both of my boys also have allergies and asthma. They both showed high for lead on a hair test. I don't have a doctor so was hesitant to try chelation route alone. Right now we just started NCD and also digestive enzymes. I would love to know more about the natural chelaters that you have used. thank you for all your advice!