At present, evidence of such benefits from phyto-estrogens is circumstantial…“it is encouraging but not definitive,” says University of Toronto professor of nutrition, Lilian Thompson. Definitive conclusions will have to await additional human clinical data.
University of Minnesota nutrition professor Joanne Slavin recommends that consumers interested in consuming phytoestrogens use “whole foods sources of phytoestrogens rather than isolated compounds, since we don't have research studies to help with dose and safety issues.”