LOL, thats a fact. If you have to ask then the answer is no. If it felt like you got hit with 110v and your muscle jumped several inches then yes it was a nerve.
Yeah its easy to build up scar tissue and it seems to hang around a long time. Also MOST people IMO inject way to fast. Ive been on TRT over 10 years and it didnt take me long to realize that most of the time the pain/discomfort the next day and even sometimes bruising is not from the needle but from you blasting the liquid in the syringe into a muscle at mach speed.
I take at least 30 seconds or more to inject 1cc. I also dont dart anymore. Again, IMO going slow you are less likely to hit a nerve or at least can back out easily if you get close.
Another little tip (pun intended) if you have to insert the syringe more than once; say you are mixing test, deca, tren or whatever for a cycle after you have done your pull put on a new needle. You would be surprised how dull the needle gets and is a lot harder to break your skin.
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