You’re right BT1978 it is so easy to obtain anything these days (dark web).
You wouldn’t really know if something is genuine unless you’re a pharmaceutical (medically trained) so again be careful, these people are skilled at what they do and that’s why they “copy” drugs to look exactly how the genuine ones look.
I’m pleased you’re supportive of your son, but look after yourself also.
Keep talking and accessing support for you also.