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.