> There are some concerns regarding high concentrations of the female hormone oestrogen, and the plant equivalent phytoestrogens/isoflavones, in whey and soy pr

> There are some concerns regarding high concentrations of the female hormone oestrogen, and the plant equivalent phytoestrogens/isoflavones, in whey and soy protein supplements. Studies in mice have shown no significant effect of whey protein after 3 months of consumption (Ketheeswaran et al., 2020), whereas in rodents a reduction of serum testosterone concentration and prostate weight has been identified with increased dietary soy phytoestrogen consumption (Weber et al., 2001), with a 20% reduction in litter size and a 25% decrease in epididymal sperm count seen in male mice fed a high phytoestrogen diet (Cederroth et al., 2010). Wonder if is it just soy protein or if soy oil also carries phytoestrogens in significant amounts.