The goal of this clinical trial is to learn if nutritional supplements could alleviate the clinical symptoms in children with autism spectrum disorder. It will also learn about the safety of these nutritional supplements. Researchers will compare the combination of nutritional supplements and behavioral intervention, to behavioral intervention alone, to see if nutritional supplements work to treat autism. Participants will receive the combination of nutritional supplements and behavioral interventions or solely behavioral interventions for 3 months. And they will visit the clinic at the beginning of the trial (baseline) and after the 3-month intervention period for examinations.