This I agree with. Thousands of products, who knows how many factories they deal with, dozens likely. No way in fuck QSC will be able to verify all those products (even if they made such effort). Their suppliers change as well.How about posting some details about quality control? As a middleman, you're pretty much sourcing from different factories. As you're selling so many different chemicals, there simply isn't a single factory on this planet who can produce all. As I'm someone doing business in China, I know manufacturers are a pain in the ass to work with and will screw you over at every possible chance, and there would have to be some quality control in place.
The basic anabolic raws are very cheap and easy to produce. You will be likely get acceptable product. The rest of the big list, it's a crapshoot.