HormoneFDA ApprovedClinical Trials

Estradiol

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

FDA Approved

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

Clinical Trials

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.