N.W.
I would say talk to a health professional to find the right amounts...and I would go with a homeopathic doctor's opinion.
I do know vitamin B-1 helps with brain function, when we do a lot of thinking we use up vitamin B-1.
I would also get him tested for Candida and get him on a good probiotic. Sometimes ADD is caused by a candida overgrowth.
http://ezinearticles.com/?ADD-is-Caused-by-Candida&id...