02-09-2014, 07:28 AM
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3601661/ 'Biological characterization of non-steroidal progestins from botanicals used for women’s health' - "Furthermore, phytoprogestins were able to activate P4 [progesterone] signaling in breast epithelial cells without downregulating PR expression."