The relationship between estradiol and longevity is complex and not fully understood. Estradiol, the primary female sex hormone, influences metabolism, cardiovascular health, bone density, and cognition. During menopause, declining estradiol levels are associated with increased risks of osteoporosis, cardiovascular disease, and possibly cognitive decline—factors that can affect lifespan. Animal studies suggest estradiol may extend life, but human data are mixed. Hormone replacement therapy (HRT) can reduce certain disease risks in some women but also carries risks (e.g., breast cancer). The net effect on longevity depends on timing, dose, and individual health status. Importantly, consumer tests measuring estradiol (e.g., saliva or blood) are not validated for longevity assessment. The evidence is primarily mechanistic and observational, not from randomized controlled trials. Without medical supervision, self-directed hormone interventions based on such tests are not recommended.
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