I wouldn’t worry about leaving test in a syringe for 3 days. If pharmacies can legally, and safely ship testosterone in preloaded syringes, which won’t be used until at least a couple of days after the pharmacy fills the syringe, I think you’ll be good. [/quote]
I get other medication (for an autoimmune condition) from my pharmacy in prefilled syringes. However, those prefilled syringes are made of glass. Not saying storing in plastic is necessarily unsafe (esp. for just three days), but one does wonder why the pharmaceutical company would bother using glass syringes unless they had a good reason.
Some use glass, some use plastic. My dr.'s office pharmacy gave me my first 4 weeks of injections in preloaded plastic syringes. With all the safety laws that pharmacies have to adhere to, I really don’t think it’s unsafe to let testosterone sit in a plastic syringe for 3 days, if my dr.'s pharmacy says it’s safe to leave in for almost 4 weeks.
But hey, if you feel safer filling the syringe each time right before injecting, then go ahead.
And btw, if people are worried about rubber from the stopper leeching into the testosterone, what about the rubber top of a 10 ml vial that isn’t emptied for over 2 months with some TRT protocols? Is that a safer rubber?