Harvard Women's Health Watch

What are bioidentical hormones?

Natural. Bioidentical. Compounded. Confusion about these terms is only adding to the confusion over hormone therapy.

Many women and health experts continue to struggle with the turnaround in attitude toward hormone therapy in the wake of the Women's Health Initiative (WHI) trial of combined estrogen and progestin (as Prempro) for preventing later-life ills. The trial was stopped early, in 2002, because hormone users had a higher risk of breast cancer, heart disease, stroke, and blood clots. Though the added risks were small, many women and their clinicians concluded they must discontinue hormone therapy. Many of these women found that hot flashes, sleeplessness, and other menopausal symptoms returned with a vengeance.

Hormone therapy is still considered the most effective treatment for symptoms. But women are not rushing back. One concern of health experts is that women are turning to alternatives they think are safer — but may not be.

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