Aaron Hartman, MD, argues the 2000 Women's Health Initiative got female hormones wrong. A 2019 reevaluation found bioidentical estrogen around menopause lowers breast-cancer risk, while synthetic progestins increase it for up to ten years after stopping.
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Everything you thought you knew about female hormones is wrong. What am I talking about? The Women's Health Initiative that came out in 2000 brought a lot of issues like estrogen causing cancer, progesterone causing cancer, clots, a bunch of things. The result was we stopped giving hormones to women. However, that exact same data was reevaluated in 2019, and they found seriously different findings. For example, they found that bioidentical estrogen actually protects against breast cancer while you're on it for 10 years and even after. So being on bioidentical estrogen for the first 10 years in menopause can actually lower your risk for breast cancer. The thing about is progestins, which are synthetic progesterone like things that are found in most birth control pills and hormones, do the exact opposite. The progestins increase the risk of breast cancer while on them for up to a decade after you.