How do you know if your gear is dodgy

I recently bought 20ml of Test Enethate and I'm pretty sure its legit. But the label on it looks dodgy. I think it might have been made in an underground lab or something because it has the name of the Lab on the label. How do you tell if it is fake, How do I know if its working, because if it is dodgy I want to stop using it straight away.
Cheers

How much are you takin?

Well, knowing what company's product you got is a good start. Having a source you trust is another way to make sure you don't get scammed. I would PM a mod with your source info and see if they have any answers for you.

At the right dose you should feel it in about 4 weeks.