Natural hormones are not bio-identical unless your body can recognize them as hormones. Natural hormones are not considered replacement unless you TRUELY replace what has been lost. Natural hormones are not bio-identical unless they replace precisely the "natural" rhythmic levels of your own estrogen and progesterone when you were a young woman.  Currently, the standard hormone replacement therapy you would receive from a doctor would be prempro, or premarin, if you've had a hysterectomy.  And doctors who want to prescribe natural hormones but who aren't familiar with the fact that hormones should mimic your natural hormone rhythms will merely prescribe natural hormones in the same way they prescribe synthetics. The Women's Health Initiative (WHM) has already found that standard to be dangerous. But what if it's not just the synthetic molecules that are dangerous? What if it's really the missing rhythm that matters?"