It is getting clearer and clearer, that environmental factors play an important role in the development of symtpoms of ADD and ADHD. Lead is one of the toxic substances which plays a role, together with mothers smoking during pregnancy. Read this article about lead:

http://www.sciencedaily.com/releases/2007/12/071203204513.htm

I can imagine that certain (alternative) treatments manage to lower the lead load in the blood; these would most probably aslo give an improvement in the symptoms of ADD and ADHD as they show in the child.
To me it seems certainly a way to investigate more, I will keep you posted on any new findings!

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