ABSTRACT  Recent studies show neurodevelopmental symptoms are strongly associated with the concentration of circulating or stored heavy metals and chemicals. They suggest enhancing the excretion of heavy metal and chemicals decreases neurodevelopmental symptoms. This study investigates the effects of dietary supplements, NDF and NDF Plus, on heavy metal and chemical detoxification and behavioral symptoms of children with neurodevelopmental disorders. Thirty four children with neurodevelopmental symptoms were separated into four groups, tested for concentrations of heavy metals and chemicals utilizing urinary porphyrins  and measuring severity of symptoms based on autism treatment evaluation checklist (ATEC). Improvements in sociability, sensory/cognitive awareness, health/physical behavior, and speech/communication were observed in different groups following intake of dietary supplements. A significant reduction in ...