Tribulus Terrestris is a strong flowering plant found in humid climates; it has shown to increase the testosterone / estrogen ratio shown in urine samples taken from competitive bodybuilders. (anabolicsmall.com)
Another surprising finding in rats maintained on intermittent fasting is increased testicular mass and testosterone / estrogen ratio compared to control rats or rats on a calorie restriction diet (57). (lift-heavy.com)
Dr. David Zava of ZRT Laboratory and our co-author of What Your Doctor May Not Tell You about Breast Cancer, has been measuring progesterone / estrogen ratios for many years in his saliva and blood spot tests, and includes them in test results. (virginiahopkinstestkits.com)