Alright, I'll provide some helpful info. Put your vial in the oven at 220 degrees for 20 minutes. Then re-filter it through a .22 Whatman into another sterile vial. Then you'd better bake that one, too, just to be safe (God only knows what those nefarious vial manufacturers are doing). I'd also recommend subjecting it to intense UV light and gamma radiation. Then, keep that vial in a triple-locked bank vault under 24-hour armed guard, lest someone sneak in while you're away and tamper with it. You really can't be too safe.
You should only ever inject in a sterile, positive-pressure room, after having your entire body scrubbed by surgical techs and receiving a protection prayer from several priests of multiple denominations. You know there are live microbes and fungal spores in the air, right? We don't want abscesses.
Better yet, just don't do AAS at all. They are known to cause psychotic rage, permanent penile shrinkage, and sudden death at any dose.
Hope this helps.