This clinical research study evaluates the safety and preliminary effects of AdiaVita (umbilical cord blood-derived stem cells and exosomes) combined with glutathione versus glutathione alone in people aged 3 and older with Autism Spectrum Disorder (ASD). In this randomized, participant-blinded crossover trial of about 100 participants, one group receives three monthly AdiaVita IV infusions plus glutathione, while the control group gets placebo saline infusions with the same glutathione regimen; the primary outcome is improvement on Autism Treatment Evaluation Checklist (ATEC) scores, with full safety follow-up through 12 months and optional crossover to AdiaVita for eligible controls. The treatment is investigational and not FDA-approved for autism, with no guaranteed benefit and risks including infusion reactions; participants pay $12,000 for the initial schedule, and all data remains confidential.