A study published in the Journal of the American Medical Association (JAMA) measured blood estradiol (a dominant estrogen) in 501 men with chronic heart failure. Compared to men in the balanced estrogen quintile,... men in the highest estradiol quintile were 133% more likely to die.
The men in the balanced quintile—with the fewest deaths—had serum estradiol levels between 21.80 and 30.11 pg/mL. This is virtually the ideal range that Life Extension® has long recommended male members strive for.
The men in the highest quintile who suffered 133% increased death rates had serum estradiol levels of 37.40 pg/mL or above.
The dramatic increase in mortality in men with unbalanced estrogen (i.e., estradiol levels either too high or too low) is nothing short of astounding.