Premature ovarian insufficiency affects an estimated three to four percent of women, and about 300,000 American women a year lose both ovaries with a hysterectomy. For them estrogen is literal replacement, yet a generation was refused it on the strength of a trial whose average participant was sixty-three. The episode covers what absence costs, what guidelines say, and the FDA's February 2026 reversal.
The FDA's decision was right in outcome but reached by an informal panel that the American College of Obstetricians and Gynecologists had asked it not to rely on. Evidence is less settled for breast cancer survivors, and the boxed warning alone cannot be shown to have caused the treatment gap.