Bioidentical Hormones Explained: FDA-Approved vs Compounded

A bioidentical hormone has the same chemical structure as the hormone your body produces. In menopause care that usually means 17-beta estradiol (the main estrogen made by the ovaries) and progesterone. By contrast, some older therapies used conjugated estrogens derived from other sources or synthetic progestins with different structures.

The term has become a marketing phrase, and it's often used as if "bioidentical" automatically means "natural," "custom" or "safer." None of those follow from the definition.

A common misconception is that you need a specialty pharmacy to get bioidentical hormones. In fact, many FDA-approved products are bioidentical - including estradiol pills, patches, gels and sprays, vaginal estradiol products, and oral micronized progesterone. These are manufactured to consistent standards, tested for safety and effectiveness, and come with standardized prescribing information.

Compounded bioidentical hormones are mixed by a compounding pharmacy for an individual prescription - sometimes in doses or combinations not available commercially, or in forms like custom creams or pellets. Compounding has legitimate uses, such as for someone allergic to an ingredient in an approved product.

However, compounded hormones are not FDA-approved. That means they haven't gone through the same review of safety, effectiveness and manufacturing consistency, and dose strength can vary more from batch to batch.

This is the key question - and the honest answer is that 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.

It is also worth being clear that estradiol is estradiol: 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, and be cautious about saliva-test-based "custom" dosing, which is not considered reliable for guiding therapy.

Before starting HRT 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?
• How will my treatment be monitored and adjusted?
• What should prompt me to stop and seek care?

Among the providers we review, Gala emphasizes FDA-approved estradiol and progesterone, Winona offers a range of forms including creams, and Midi Health prescribes through your own pharmacy. Compare them in Gala vs Midi Health.

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