DMG: you can give him up to 6 cap per day. However, most kids, 2-3 cap is good enough. Also be sure to give him in the morning only because it may cause him not to fall asleep if you give him in the afternoon/night. You can get this info from the book "children with the starving brain".
My son had this for about one month back in June, 2006. After we starting the biomedical intervention (GFCF diet and some supplements), this kinds of behaviors gone.