This study reports the effects of two nutritional products upon the severity of symptoms in children with confirmed diagnoses of Attention-Deficit Hyperactivity Disorder (ADHD): a glyconutritional product containing saccharides known to be important in healthy functioning and a phytonutritional product containing flash-dried fruits and vegetables. Seventeen ADHD children were recruited from a local parent support group. Parents of five of the subjects did not have their children on methylphenidate. Of the remaining twelve, all on methylphenidate, six were left on prescribed doses (random assignment). The other six had their doses reduced by half after two weeks (study duration was six weeks). The subjects were assessed initially and three subsequent times over a period of six weeks (longitudinal nonrandomized design). The behavior disorder items for ADHD, Oppositional Defiant Disorder (ODD), and Conduct Disorder (CD) as listed in the Diagnostic and Statistical Manual for Mental Disorders (DSM IV) (American Psychiatric Association, 1994) were rated by teachers and parents on a 3-point scale. Also included was a Side Effects Scale described by Barkley (1990). The children received the glyconutritional supplement for the entire six weeks. After three weeks, the phytonutritional supplement was added to the diet to increase the probability of positive results. The glyconutritional supplement decreased the number and severity of ADHD, associated ODD and CD symptoms, and side effects in all groups during the first two weeks of the study. There was little further reduction with the addition of the phytonutritional supplement. The three study groups did not differ statistically in degree of reduction over observations. Present results suggest that symptoms of ADHD may be reduced by the addition to the diet of saccharides used by the body in glycoconjugate synthesis.