We are also using Buttar's protocol. My son has started chelation just 2 months ago. He turned five in October. we have noticed some old behaviors coming back. I have read this is normal for some children and that the chelation takes about three months to start pulling mercury out. Therefore we don't see much improvement till then. We are noticing longer sentences and also he is now fully potty trained. So we see some improvements but with some regession. How was your son in the first 2 months of starting chelation? How long did it take for you to see big improvement?