All children should be on a Multi Vitamin and extra Vitamin C.
For children with allergies there are all sorts of remedies and your child can be tested by muscle testing to see which foods need to be discontinued.
Children who are hyperactive or have attention disorders should be on the Essential Fatty Acids, there have been excellent results from the Blue/Green Algae and one of the calming remedies which there are plenty of that are completely safe for children. Please rather do anything Alternate than go on Ritulin as the side affects are horrendous.