Good answer ,You can use it thru out a cycle if you choose however since its effects are so gradual its best to start 2 weeks before PCT so it will be in your system good. add some HGregenerate and unleashed and you're good to go.
I started one day after my last PCT shot of HCG. I figured the HCG would keep me going 5-8 days and figured the SARMS-S4 would take two weeks to kick-in.