Okay I'll put it this way
With ANYTHING that will supress your natural testosterone production, you should have a SERM in PCT to do the following: 1) Help boost natural test levels, and 2) prevent that new test that is coming back from aromatizing into estrogen at SELECTIVE PLACES (hence serms)
Therefore, if you run 1-Andro, you will be and feel shut down (your balls stop working well)
When you're off, you're body will recognize the lack of hormone and make new test. Aromatase will turn some test into estrogen. Estrogen will bind to various receptors in the body. You may get gyno, you may not, depending on genetics.
In PCT, run a SERM to avoid this. An OTC PCT will boost ur LH and help to get test up quicker, as your body will push for equilibrium, however to prevent issues, run a SERM. You can get one for like 50 bucks. If 50 bucks isnt worth no bitch tits and a good PCT, then dont cycle