> any approvals would require having a particular condition to get a prescription (or an unethical doctor)

Wrong on both counts.

Let me introduce you to indian online pharmacies, where you can get mostly anything already. I get my eyedrops from less than the US deductible, delivered at my door. I have a prescription, but they didn't even check.

Even better: some molecules are on any restricted list, and thus legal to buy. IIRC, mk667 is very popular for weightlifters.

So I think everybody will be able to get their hands on these as soon as their efficiency is proved.