I'm 17 and was recently (about 2 weeks ago) put on testogel because I was way behind on my pubescent devlopment. I was basically at stage 1 at 16. How long will it take for the gel to take effect? Like how long until my penis starts growing, I get hair Etc. Within the first few day of being on the gel my sex drive went through the roof! Everytime I would see any photos of a good looking woman, I will get an erection. Which must mean the gel is working. But how long until I hit the next stage of puberty and I start "growing" as normal?