I have read many things about soy isoflavones and their estrogenic activities. I have read that they decrease free test by negative feedback due to estrogenic activity, and i have read they have no effect. I also have read that they seem to help out with prostate issues, and may not be as transcriptionally active as estradiol itself.

So now i wonder, would soy isoflavones be of benefit on cycle? If they help reduces prostate cancer, why not? You are already causing massive neg. feedback due to exogenous steroids, whats the harm. Plus, in theory, if they have higher affinity for the estro. receptors, soy isoflavones may work as a anti estrogen (to some degree), correct? I have also read that S.I. may increase aggresiveness, which may be usuful. Im not sure how much of it is just heresay.

Does anyone have any experience with this? I have a bottle of soy isoflavone extract, and am about to cycle, and am thinking about testing it out.