Well a few months ago I was on here saying |I wouldn't give ds high levels of supplements, etc, but after some huge meltdown tantrums I gave it a try.
After nearly 2 months on them I can honestly say that we don't get the same level of tantrum, and I can deal with him on my own a lot better, he gets much less upsedt about little things.
Don't know about concentration tho', I don't expect a young child to have a long concentration span.