Its not as good as nolva, I have a ton of researhc on it but let me just say it people who have low levels of estrogen it acts like estrogen, it people who have high levels of estrogen it acts as an anti-estrogen. However there are atleast 3 better phytoestrogen that would be as good or better at the same thing.
4-oha has really good anti e properties, however, since it has a metabolite (4OHT) it will bind tightly to the AR as well as prevent further upregulation. It will continue to suppress. Edog has his view on it, the rest of the world has an entirely different view.
If you are uinsg it while on cycle, then it will work fine but to restore function of the HPTA, I wouldnt hold my breath.