Learn · Hormonal Health

HRT vs BHRT: What's the Difference, Really?

The terminology is genuinely confusing because the marketing has muddied it. We use the actual clinical definitions on this page.

Last updated May 2026.

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Definition

Bioidentical

Structurally identical, at the molecular level, to a hormone the human body produces. 17-beta-estradiol and micronized progesterone are bioidentical. Conjugated equine estrogens (Premarin) and medroxyprogesterone acetate are not bioidentical.

FDA-approved bioidentical HRT exists

This is the part most marketing leaves out. Estradiol patches, gels, creams, sprays, and pills, and oral micronized progesterone (Prometrium), are FDA-approved AND bioidentical. They are the most studied form of HRT and the standard of care in NAMS guidance. There is no clinical reason to default to compounded preparations when FDA-approved bioidenticals deliver the same molecules with documented manufacturing standards.

Comparison

Side-by-side comparison.
 Bioidentical?FDA-approved?PharmacyEvidenceTypical use
Estradiol patch / pill / gelYesYesCommercialStrong (RCTs)First-line systemic estrogen
Micronized progesterone (Prometrium)YesYesCommercialStrong (RCTs)First-line progestogen with uterus
Conjugated equine estrogens (Premarin)NoYesCommercialStrong but older trials (WHI)Less commonly first-line today
MPA (Provera)NoYesCommercialStrong but unfavorable breast safety vs progesteroneRarely first-line today
Compounded estradiol+progesterone (often called BHRT)YesNo503A pharmacyIndirect (no large RCTs of compounded specifically)Used when commercial doses or routes don't fit
Pellets (testosterone, estradiol)YesNo (compounded)503A pharmacyModerateQuarterly dosing convenience; cannot be removed if dose is wrong

What 'compounded BHRT' actually offers

Compounded BHRT is genuinely useful in narrow contexts: when the commercial dose options do not fit, when a patient cannot tolerate excipients in commercial products, or when a unique combination is needed. Beyond those cases, compounded preparations are not 'safer' or 'more bioidentical' than FDA-approved bioidentical HRT, despite marketing claims that imply otherwise.

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Frequently asked

FAQ: HRT vs BHRT: What's the Difference, Really?

Sources

Citations & references

  1. [1]NAMS 2022 Hormone Therapy Position Statement.
  2. [2]ACOG Committee Opinion 532, Compounded Bioidentical Menopausal Hormone Therapy.
  3. [3]Endocrine Society Scientific Statement on Compounded Bioidentical Hormones.

Next step

Talk to a Genesis provider in Colorado Springs.

Schedule a consultation. Physician-led, evidence-graded.