Estradiol is the most potent form of estrogen and is the cornerstone of menopausal hormone therapy (MHT). Strong human evidence from RCTs and meta-analyses shows that estradiol effectively reduces vasomotor symptoms (hot flashes, night sweats), vaginal atrophy, and bone loss. It also improves sleep and quality of life. However, therapy requires careful risk assessment: in women with an intact uterus, a progestogen must be added to prevent endometrial hyperplasia. Contraindications include hormone-sensitive cancers, unexplained vaginal bleeding, and thromboembolic disorders. The timing of initiation (the 'window of opportunity') influences cardiovascular outcomes. The provided context does not contain specific studies or guidelines on estradiol; this answer reflects established medical consensus. Note: Consumer genetic tests for estrogen metabolism (e.g., CYP1A1, COMT) are not validated for guiding MHT and should not replace clinical evaluation.
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