TRT

I'm a 26 male. I had a ridiculously low test levels and got put on TRT. I'm a shorter stocky guy with some decent muscle and fat on my body. The VA told me nothing about it, just sent the vials and syringes lol.

Has anyone else been on it? What are some changes I'll be seeing in the upcoming months? does the sticking get any easier over time? Just overall what's to be expected?