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Study Suggests Hormone Replacement Therapy May Reduce Alzheimer’s Risk

Researchers said HRT users had a 16% lower dementia risk, with the biggest benefit seen after surgical menopause and in women with APOE4 variants.

  • A new study tracking 183,450 postmenopausal women over 13.3 years found HRT linked to a 10% lower likelihood of dementia and 16% lower risk of Alzheimer's disease among users.
  • The researchers support the "critical window" hypothesis, suggesting HRT may be more beneficial when initiated closer to the menopausal transition rather than later in life.
  • Women who underwent surgical menopause saw a 26% lower risk of developing dementia, while those who began HRT between ages 46 and 56 experienced the greatest reduction in risk.
  • David Llewellyn from the Exeter Medical School said these results represent a "significant step forward," noting that associations between HRT use and dementia were stronger in women carrying the APOE4 gene variant.
  • Collis from the BBSRC added that findings suggest HRT could have greater protective benefits for specific groups, offering new insights into how menopause timing may influence future dementia risk.
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Study suggests hormone replacement therapy may reduce Alzheimer’s risk

Research shows women who had used HRT had a 16% lower risk of developing Alzheimer's disease, the main form of dementia.

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Knowridge Science Report broke the news on Wednesday, August 26, 2026.
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