Bro, lots of steroids are suspended in sesame oil and BA bro. If you buy from a legit company or lab, it will be sterile. Now if you buy it from some dumbass that made it in his crackhouse, thats another story.
And pizmo, The injection doesn't hurt because it is unsterile. All 1-test injections are going to be painfull just like most testosterone injects are...bottom line (sterile or not). And I doubt you will have any liver issues with injectable 1-test because you will not be swallowing it.