Bioidentical Hormones (2026): FDA-Approved List vs Compounded

Older menopause therapies often used conjugated equine estrogens (Premarin, a mix of estrogens from pregnant mares' urine) and synthetic progestins such as medroxyprogesterone acetate (Provera). These are not bioidentical: their structures differ from human hormones. They're still FDA-approved and effective, but the large Women's Health Initiative trials of the early 2000s used them, which is one reason some women now ask specifically for bioidentical options.

The word has also become a marketing phrase. It's often used as if "bioidentical" automatically means "natural," "custom," "plant-based" or "safer." None of those follows from the definition. Pharmaceutical estradiol and progesterone are made in laboratories (typically from plant-derived starting materials) whether they end up in an FDA-approved patch or a compounded cream. For the basics of hormone therapy itself, see what is HRT?

Yes - many. Estradiol pills, patches, gels, a spray, vaginal creams, inserts and rings, oral micronized progesterone, and a capsule combining estradiol and progesterone are all FDA-approved and bioidentical.

A common misconception is that you need a specialty compounding pharmacy to get bioidentical hormones. In fact, most modern hormone therapy prescribed in the US is already bioidentical estradiol, and micronized progesterone is widely available as a generic. These products are manufactured to consistent standards, have been tested for safety and effectiveness for their approved uses, and come with standardized prescribing information and dosing.

These FDA-approved products contain hormones chemically identical to the ones your body makes. Many are available as generics, and brand availability changes, so use this as a guide to the categories rather than a shopping list.

A few notes:

• Estradiol acetate (Femring) converts to estradiol in the body, so it's generally grouped with bioidentical estradiol products.
• Combination patches such as Climara Pro and CombiPatch pair estradiol with a synthetic progestin, so they're only partly bioidentical.
• Prometrium capsules contain peanut oil, so they aren't suitable for people with a peanut allergy - ask about alternatives.
• Estriol is not in any FDA-approved US product; estriol sold in the US is compounded.

Which product, route and dose suits you - and whether you need progesterone at all - is a decision for a licensed clinician. For more on choosing a route, see estrogen patch vs pill, and for the progesterone side, our progesterone guide.

Compounded bioidentical hormones are preparations mixed by a compounding pharmacy for an individual prescription - often custom creams, gels, capsules, troches (lozenges) or pellets, sometimes combining several hormones in one product. They are not FDA-approved.

Compounding has legitimate uses: for example, when someone is allergic to an ingredient in every approved product, or needs a dose or form that isn't manufactured. But compounded hormones haven't gone through FDA review of safety, effectiveness and manufacturing consistency. The National Academies of Sciences, Engineering, and Medicine reviewed compounded bioidentical hormone therapy in 2020 and concluded that there was insufficient evidence to support its safety and effectiveness, recommending that its use be restricted.

Common compounded products

• "Bi-est" and "tri-est" creams - mixtures of estradiol and estriol (and sometimes estrone) in set ratios.
• Progesterone creams - absorption of progesterone through the skin is unreliable, and these are not considered adequate to protect the uterine lining when you take estrogen.
• Hormone pellets - implanted under the skin and lasting months; doses can't be adjusted or removed easily once placed, and some studies have reported hormone levels well above the normal range.
• Troches and custom capsules - dissolving lozenges or capsules in personalized doses.

The evidence does not show compounded bioidentical hormones are safer or more effective than FDA-approved hormone therapy. Major professional bodies, including The Menopause Society and the American College of Obstetricians and Gynecologists, generally recommend FDA-approved products over compounded ones for most women.

There is some evidence that the type of hormone matters in specific ways:

• Transdermal estradiol (patch, gel, spray) is associated with a lower risk of blood clots than oral estrogen.
• Micronized progesterone may carry a lower breast cancer risk than some synthetic progestins, based mainly on observational studies, and appears neutral for clot risk - though evidence on endometrial protection over very long use is thinner than for some progestins.

Those advantages apply to FDA-approved bioidentical products, not only compounded ones. And being bioidentical does not remove the class risks of estrogen therapy: blood clots, stroke, breast-cancer considerations and - without a progestogen - endometrial cancer for women with a uterus. Be skeptical of any provider claiming otherwise.

The FDA's 2025-2026 label updates removed several boxed warnings from menopausal hormone therapy products; the details, and what didn't change, are in our guide to the black box warning changes.

FDA-approved bioidentical hormones offer a molecule identical to your own hormones with tested, consistent dosing and usually insurance coverage. Compounded versions offer customization but lack FDA review, dose consistency and, usually, coverage.

No - not reliably. Saliva hormone testing isn't considered accurate for guiding menopause hormone therapy, and routine blood tests aren't needed to dose most HRT. Clinicians adjust treatment based on symptoms and side effects.

Hormone levels fluctuate through the day and from cycle to cycle, especially in perimenopause, and saliva levels don't track reliably with blood or tissue levels. Some compounding-focused clinics market "hormone balancing" based on these tests; The Menopause Society and ACOG advise against it. Blood tests do have a role in specific situations - for example, checking testosterone levels when testosterone is prescribed, or when absorption is in question.

FDA-approved bioidentical hormones - especially generic estradiol and micronized progesterone - are usually covered by insurance and Medicare drug plans, often at low copays. Compounded hormones and pellets are usually not covered and are paid out of pocket.

If cost matters, ask your clinician for a generic FDA-approved product your plan covers. Self-pay online services price differently: some bundle medication into a monthly fee. See our online HRT cost comparison for real numbers.

All five providers we review can prescribe bioidentical estradiol and progesterone; how clearly they separate FDA-approved from compounded products differs.

• Winona - its estradiol tablets, estradiol patch and progesterone capsules are FDA-approved; its estrogen body creams are compounded bi-est made in Winona's own pharmacies. See Winona's products explained.
• Midi Health - prescriptions go to your own pharmacy, so you typically receive standard FDA-approved products priced through your insurance.
• Gala - offers estradiol (pill or patch) and progesterone; its site carries a compounded-medication disclaimer, so ask which product you'd receive.

Compare them side by side in our online HRT providers comparison.

Before starting hormone therapy online or in person, it's reasonable to ask:

• Is this an FDA-approved product or a compounded one - and if compounded, why?
• Which estrogen and which progestogen am I getting, in what form and dose?
• If I have a uterus, how is my uterine lining being protected?
• Is there a generic version my insurance covers?
• How will my treatment be monitored and adjusted?
• What symptoms should prompt me to stop and seek care?

For the bigger picture of benefits and risks, read is HRT safe? and our complete menopause guide.

This article is general information, not medical advice. A licensed clinician should decide which hormone products, if any, are right for you.