When you start the trial of DMG, don't confuse the results by simultaneously starting other vitamins, drugs, or other forms of treatment that might make it difficult to tease out the effects of DMG from the effects of the other things tried. If the child is already taking vitamin B6 and magnesium, or anything else that is helpful, there is no reason to stop taking the B6 (or whatever). The DMG is merely a highly concentrated food. It may in fact improve the effectiveness of the B6.