I don’t really know what celebrities do.
Testosterone replacement therapy is just that. It’s replacement for something that should already have been there, but wasn’t? Off hand do you know what your testosterone levels are? If they were garbage to start with, the you may well see a boost from 100mg a week just bringing you into mid range.
If they weren’t low, 100mg a week may actually be less than what your body was already making.
Also are you taking HCG?