How to ensure the Ozempic you are getting is legit?

I don't trust any medication i get in Thailand, unless it's from a hospital (and even then there's only a few i trust). It's literally the wild wild west out here.

Now with regards to Ozempic, alot of clinics here are selling it. I've noticed my last few batches have had no effect on me whatsoever, and i am pretty certain they were just insulin - which is what alot of the counterfit Ozempics are. 

My question being does anyone know how you can ensure you are getting a correct vial of ozempic? The clinic i usually buy from say you can type in the code on the box into a website, but i can't find where. But even that isn't that fool proof, as the counterfitters can simply use real legit codes on their counterfit boxes. 

Help me out here.