Estradiol / Estrogen
Hormone Restoration
In plain English
Estradiol is the main estrogen hormone. It is used mostly to relieve menopause symptoms such as hot flashes and vaginal dryness, and it helps protect bone. It can be taken as a pill, lozenge, cream, or injection. Women who still have a uterus generally also need a progestogen to protect the uterine lining.
The science
Estradiol is the principal endogenous estrogen and acts through nuclear estrogen receptors ER-alpha/ER-beta to regulate reproductive tissue, bone turnover, vasomotor stability, and lipid metabolism. Menopausal hormone therapy is the most effective treatment for vasomotor symptoms and genitourinary syndrome of menopause and prevents bone loss/fracture; the benefit-risk balance is most favorable for symptomatic women under age 60 or within 10 years of menopause onset (NAMS 2022). The Women's Health Initiative quantified risks that vary by regimen, age, and time since menopause—estrogen-plus-progestin increased breast cancer, stroke, VTE, and (in older women) dementia, whereas estrogen-alone had a more balanced profile. Unopposed systemic estrogen causes endometrial hyperplasia in women with a uterus and must be combined with adequate progestogen (PEPI trial). FDA-approved estradiol products exist across routes; VPI's compounded troches/creams/injectables are not FDA-approved formulations. Contraindications include estrogen-sensitive cancer, unexplained vaginal bleeding, active thromboembolic disease, and active liver disease.
References
- The NAMS 2022 Hormone Therapy Position Statement, Menopause 2022
- Manson et al., JAMA 2013 (WHI integrated overview)
- Writing Group for the PEPI Trial, JAMA 1996 (endometrial protection)