Safe Natural Aromatase Inhibitors?

I am research aromatase inhibitors and estrogen blockers, does anyone know of any natural sources of this? Chrysin appears to be disproven as being effective. I’ve never been on steriods or anything hormone related with the exception of tribulus, which I do take.

Any testimonials of anything that has worked and people think is safe would be much appreciated.

I heard revasterol acts like an estrogen blocker.