From what I have read, most of them aren't even using *synthol*...in Brazil there is a cheaply available product called ADE - It is a veterinary-grade Vitamin A,D,E supplement for cattle (primarily) It's the vitamins in vegetable oil. It's dirt cheap, doesn't require special rights to get, and is readily available.
The cheapness is why some of these guys can even *afford* to inject that much - do you want to estimate the cost of a couple of litres of synthol?
The product *grade* is one of the reasons, every once in a while, you get one that has to get a couple of pints of pus drained out of them too....sigh
Doctor9