Really dbol from any good lab should be good to go, it is not often faked because it is fairly cheap and it is easy to tell if you have legit dbol so any lab faking it would be taking themselves right out of the game.
I wondered that same thing here in Mexico with Sciroxx and Omega. At one point I was taking 160mg a day and nothing, they were the final straw with UGs here and I changed to strictly homebrewing.