Can't agree with this enough. Some "experts" are going so far as to recommend underground labs over real pharmaceuticals, based on price, availability, and the fact that "The owners use the gear themselves". This is a very dangerous attitute to have, IMO. Underground gear is by and large made in unsterile conditions, and with "food grade" ingredients. There are a few labs I would exclude from this list, but buying UG as a normal rule is certainly a very bad idea. If possible, always stick with the real drug companies, human-use in most markets preferably.
The problem with UG's is that there is no consistent quality control from one batch to the next, other than how the guy is feeling/operating that day.
You really take your health in your hands in ways that would not be in question if you were only to use Pharmaceutical grade AAS.
The difference between UG Sustanon vs. Organon Sustanon?
Even if quality wasn't a factor (which it is), you've got the added risks of unsterile material and contamination from various possible sources, which is unfortunate, but a real risk.
Ideally, the worst possible outcome should just be low gains, not an abscess.....
DIV
