> It's not a great accomplishment to link to a paper that performs well in organic search.

It's a cursory BS test. If the evidence is hard to find, it's generally because there's no evidence available from credible sources. Belief that the truth is out there, is not sufficient anymore.

The Cochrane Collaboration has nothing.

A google search might lead to the NIH having an article citing "studies" about various related effects, but mostly says nothing and has 0 references. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1480510/

But if you search the NIH databases via https://www.ncbi.nlm.nih.gov/pubmed using (soybean[Title/Abstract]) AND men[Title/Abstract] you'll come across a doctor who wrote this: http://www.jurology.com/article/S0022-5347(11)60100-6/fullte... - admittedly, I don't think it's compelling as a standalone opinion.

This is a study, by a relatively small organization is better: http://jn.nutrition.org/content/132/3/570S.long

You might benefit from seeing the evidence in favor of Soy being a serious factor in reducing prostate cancer rates and other such ancillary benefits.