In this study, we report the results associated with a novel type of immunotherapy based on a supplement containing low-molecular-weight chondroitin sulfate, phosphatidylcholine, and vitamin D 3 . In October 2018, the Biomedical Centre for Autism Research and Treatment of Bari, Italy, started using this approach on autistic subjects. By January 2019, several scores of patients have been treated; here, we describe the cases of three autistic patients for whom the treatment was remarkably effective. In order to obtain the most objective and complete evaluation of results, we used the Autism Treatment Evaluation Scale (ATEC), a diagnostic assessment tool that has been demonstrated effective in evaluating interventional effects in autism. Our observations indicate that some of the most representative symptoms of autism were completely normalized after eight weeks of treatment and other showed a trend toward normalization. No adverse effects were reported. Based on the cases described in this report and on our ongoing research, we are convinced that this type of supplementbased immunotherapy can be beneficial to autistic patients and represents a new and promising treatment. We expect that the described approach will play a central role in future treatments for autism, both alone and in combination with other therapies such as behavioral therapies, nutritional interventions or manual lymphatic massage.