Oxytocin peptides look promising. You can order powder that you have to mix with bac water then can inject via insulin syringe. Not sure if any wellness centers use the peptide for autism though. If you order yourself without a prescription, all product states for research purposes only.

OXYTOCIN AND AUTISM Mouse models have demonstrated oxytocin’s role in social recognition, attachment, and stereotyped behaviors,111–113 which correlate with core deficits in autism spectrum disorders (ASD). Oxytocin has thus been investigated both for its role in the pathophysiology of ASD and as a potential therapeutic target for these disorders.

https://journals.lww.com/hrpjournal/fulltext/2013/09000/the_role_of_oxytocin_in_psychiatric_disorders__a.1.aspx