Bioidentical vs traditional HRT: what's the difference?
Reviewed by the WeighedHealth Editorial Team against primary clinical sources — FDA labeling, peer-reviewed trials, and specialty-society guidelines.
Content current as of July 2026; updated when guidance or availability changes.
'Bioidentical' means the hormone molecule is structurally identical к what the human body produces — 17β-estradiol для estrogen, micronized progesterone for progesterone. 'Traditional' originally meant conjugated equine estrogen (Premarin) derived from pregnant mares' urine + medroxyprogesterone acetate (Provera). FDA-approved bioidentical options now exist (Estrace, Prometrium, Climara patches, Vivelle dot, Combipatch) — these are bioidentical AND regulated. The marketing confusion comes from 'custom compounded bioidentical hormone therapy' (cBHT) sold by some clinics — these are NOT FDA-approved, lack quality control, and the 2020 NAS report found no evidence they're safer or more effective than FDA-approved bioidenticals. Stick с FDA-approved bioidentical options unless your clinician has a specific medical reason for compounding.
Related questions
Is hormone replacement therapy (HRT) safe?
For healthy women under 60 or within 10 years of menopause, modern HRT is generally safe and effective. Transdermal estradiol has lower clot risk than oral. Combined therapy (estrogen + progesterone) has a small breast cancer signal after 5+ years. Risk-benefit is personalized.
What are the earliest perimenopause symptoms?
Earliest perimenopause signs: sleep disturbance (3 AM waking), irregular or heavier cycles, new-onset anxiety, increased PMS-like mood swings. Hot flashes come later. FSH testing unreliable — diagnosis is clinical based on age + symptoms.