I think this is not really a charitable take. For one, nearly everything medical needs certain purity and concentration so you need specialized equipment. For two, even if a chemical is easy to produce by industrial standards, you still need to run trials to prove that it's both safe and actually does what you hope it does.
They could have, but they would have been seen as just another “weight loss supplement”. Which I imagine is a real uphill communication battle to convince people that you’re just not another scam.
Well Trump just pardoned Ross Ulbricht who sold unapproved injectable drugs, so you can at least get away with shipping them into the United States, as long as you're not Mexican or Canadian.