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by aparent 3856 days ago
A small addition to noondip's reply:

"Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis." https://www.ncbi.nlm.nih.gov/pubmed/19524224

Also you say that you have not seen enough studies to rule these out; what studies have you seen to make you believe they might be an issue?