Just adding my two cents, but I would recommend taking a good look at what I believe may be the best all-around nutritional product for children: intraKID. It contains a whopping 215 different nutrients. Here is a condensed description:
ALL Ingredients Are 100% Carbon-bond ORGANIC microcomplexed™ & Homeostatic
I am not trying to sell anything and have no connection with the company where I found the full ingredient list. It surely is not cheap and by mandate of the manufacturere cannot be sold for less than $70 per bottle. I note that I regularly take the adult version intraMAX and report that I and several others I know, including some other CZ members, report that this is one of the few supplements they have taken where they have felt an almost immediate improvement.