Some guys choose to buy cheap juice I mean i really cheap inj solution.. What the often don't realise is that THEY pay the price. UG Labs that sell cheap gear mostly buy cheap carrier oils, mostly veggie cooking oil from the supermarket. Industrial grade solvents and co-solvents and cheap API's (raw powders). Sometimes they are scammed by middleman from China or India because they don't know where to buy or who to trust. They also have no entrance to analyses.
See attached a powder analyses of Tren
Because the same contaminants ( peaks) are visible at both mass spectra (Enanthate- Acetate) it also reveils something about the quality of the the substrate (trenbolone base).