For pct, you use SERMs to kickstart your balls and increase your natural testosterone level back to baseline or above.
AIs are mainly used on cycle for estrogen related sides, however, they too result in an increase of natural testosterone. Although, SERMs should be used instead of AIs for pct.
If you see gyno is occuring on your cycle, you can start an AI (really you should have already been running one) or double the dose that you were previously taking.
Coming together?