Hello Sir, M 22 Doing Gym From Last 2 Years

Hello sir, M 22 doing gym from last 2 years but now m being suggested to get a course of testaviron nd deca together for 10 weeks I jst wanted to make a proper gain so dat after dat i can continue my gym jst with protein supplement to maintain those gains ! Will it be still harmfull for me plzz suggest as soon as possible !
Thank you .