It's a SI and the way to go IMO.
Clomid and Nolva are competitors. So are DIM and I3C which is why they too didn't work for me and I left them out of "POST CYCLE."
For me, both the drugs and the supps just add "more" estrogen and e-like symptons. (Clomid kills my dick).
Proviron blocks estro by reducing SHBG. (An overlooked technique).