I live in a town of 17,000. There's a great MMA gym with decent UFC competitors, there's a Anytime Fitness, and there's a YMCA. I've seen quite a few people at each (I'd say 3-5), that are clearly on something.
This of course doesn't guarantee they're on Test. Some with the immense size, I would only have to assume they're on Test, because that sort of size doesn't come overnight, and a male with 0 test for that long is simply unheard of.
So, the whole.. pharm grade, underdosed thing... Well, that depends on if you're getting from someone who buys loads of real shit from other countries... or if your source buys off an ******* top 5 and sells to you for double price and potentially underdosed.
Best thing I could recommend is to focus on diet and getting big naturally.. while doing so, read up on several sources, find a common site recommended across many boards, not just a single one, and then order enough for a test only cycle. Make sure to have all PCT and intra cycle compounds on hand before starting. Have bloods done before to see where you stand naturally (test wise) and then inject set amount per week, and take bloods again at week 7-8 and see if it's legit... If it's fake, your test will not be high and you'll have wasted money, but! if it's real you can continue the cycle and you'll have everything to stay safe doing so.
If you're under 25, forget about it completely. Focus on diet, training, and sleep. Wait until your brain is developed fully.
If you're fat, >20% cut to <15%.. or you'll have a hard time with estrogen related sides.
There's a lot more to worry about than just whether it's dosed properly.. even if it's half dosed you'll still get shut down, and you'll still need an AI, SERMS, and HCG.. just keep that in mind.