Jennifer Gerson

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Influencers are breathlessly declaring that estrogen during perimenopause has been proved to dramatically reduce the risk of breast cancer.

But, of course, the reality is more complex. Here’s what we actually know.

A new retrospective study looked at more than 120 million patient records and the impact of estrogen therapy when started during perimenopause — or the roughly 10-year period before the final menstrual period — compared with that of estrogen therapy after menopause and no estrogen therapy.

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The study found that perimenopausal people who had used estrogen for at least 10 years prior to menopause had an approximately 60 percent decreased risk of develop

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