Estradiol
Also sold as Estrace, Climara
About
About Estradiol
Estradiol is the primary biologically active estrogen and is the cornerstone of female hormone replacement therapy for menopause management. It protects against cardiovascular disease, osteoporosis, cognitive decline, and urogenital atrophy. Transdermal delivery avoids first-pass metabolism and provides more stable levels than oral estrogen. It is used in optimization medicine to maintain youthful estradiol levels in perimenopausal and postmenopausal women.
Science
Mechanism of Action
Binds estrogen receptors alpha and beta throughout the body, modulating gene expression in cardiovascular tissue, bone, brain, and skin — maintaining vasomotor stability, bone mineral density, and synaptic plasticity.
Dosing
Typical Protocol
0.025–0.1 mg/day transdermal patch (changed twice weekly) or 0.5–2 mg topical gel/cream daily; must be paired with progestogen in women with a uterus.
⚠ Protocol information is for educational purposes only. Dosing must be determined by a licensed physician based on individual health status and goals.
Regulatory
Legal Status in 2026
This compound has completed clinical trials and received formal FDA approval for one or more indications. It can be legally prescribed by licensed physicians, filled at any licensed pharmacy, and may be covered by insurance. Off-label use by physicians is also legal. This is the highest level of regulatory clearance available in the US.
Evidence
Evidence Tier
Evidence from randomized controlled trials (RCTs) or large observational studies in humans. This is the gold standard — effects have been measured in controlled conditions and results are peer-reviewed and reproducible.
Compare verified providers offering Estradiol
All 8 audited providers, ranked by Vial Check by default. Click any column to sort.
Compound comparisons
Compare Estradiol
Estradiol set against other compounds people weigh it against.
This page evaluates compliance signals, not clinical outcomes. Consult a licensed physician before starting any therapy, medication, or treatment. Vial does not provide medical advice.