i would use it during the cycle
to keep sex drive up (which can be done with Test, but not everybody takes Test).
And in the same time fight Estrogen problems.
Some guys only use a gyno preventer AFTER the cycle, which is very hard for me to understand. If i take 500 mgr Sust/week gyno is coming on very very strong, so i have to take Proviron from the first day. If i wait for 8 or more weeks, i will have gyno before even taking a preventer.