Bioidentical Hormone Replacement: What It Is, How It Works, and Who It Helps

In the early 2000s, about 40% of postmenopausal women in the U.S. were using hormone therapy. Then a single study made headlines, fear took over, and that number crashed to roughly 4%. It has barely recovered since.

That means an entire generation of women has been told to just push through the hot flashes, sleepless nights, mood swings, and brain fog. Many were never offered another option.

Since then, researchers have learned a lot more. We now know that the type of hormone, the way it's delivered, and when you start all make a big difference in efficacy and safety. That's where bioidentical hormone replacement therapy, or BHRT, comes in. Here's what it is, how it works, and how to know if it's right for you.

What Does "Bioidentical" Actually Mean?

"Bioidentical" simply means the hormone has the exact same molecular structure as the hormones your body makes on its own. Your body recognizes it and uses it the same way.

That's different from some older hormone therapies, like hormones made from horse urine or synthetic progestins, which are similar to but not identical to your own.

The Hormones We Use

Every plan is personalized, but most include some combination of these hormones:

• Estrogen (Biest). A blend of estradiol and estriol, two forms of estrogen your body naturally makes. Estrogen is the heavy lifter for hot flashes, night sweats, vaginal dryness, sleep, and bone protection.
• Progesterone. Often called the "calming hormone," it's tied to sleep, mood, and anxiety. For women with a uterus who use estrogen, the right progesterone is also essential for protecting the uterine lining.
• Testosterone. In small, carefully monitored doses, it can help with sex drive, energy, and muscle. Read more in our guide to testosterone for women.
• DHEA. A hormone made by your adrenal glands that your body uses to build other hormones. Levels drop steadily with age.

Creams, Capsules, and Injections: Finding the Right Form

How a hormone gets into your body matters just as much as which hormone it is. That's why we don't use a one-size-fits-all approach.

Hormone Creams

Creams are absorbed through the skin, and that matters for estrogen. When you swallow estrogen, it passes through your liver first, which can affect clotting factors. Through the skin, it skips that step.

The research backs this up. In a large study of more than 80,000 women with blood clots, published in the BMJ, oral hormone therapy was linked to a higher clot risk. Estrogen applied to the skin wasn't linked to any increased risk at all. Compared head to head, oral estrogen carried about a 70% higher clot risk.

Creams also make it easy to fine-tune doses and combine several hormones into one simple daily step.

Oral Progesterone

For many women, progesterone works best as a capsule taken at bedtime. Oral micronized progesterone is bioidentical, and it's considered the gold standard for protecting the uterine lining in women who still have their uterus and use estrogen. As a bonus, many women find it helps them sleep more soundly.

Testosterone Injections

Injections are a common and effective way to deliver bioidentical testosterone, especially for men on testosterone therapy. They allow precise, consistent dosing on a regular schedule, and many patients like not having to remember a daily application. See testosterone injections at Abbott.

FDA-Approved Options

Estradiol patches, gels, and sprays are also bioidentical and FDA approved. For some patients, they're the best fit, and we're happy to use them.

The Honest Part: Compounded vs. FDA-Approved

You'll find a lot of big promises about bioidentical hormones online, but let's look at the full picture.

Bioidentical doesn't automatically mean compounded. Several FDA-approved hormone products are bioidentical too, including estradiol patches, gels, and sprays, and oral micronized progesterone. Compounded creams are made by a specialty pharmacy for one specific patient.

Compounded hormones aren't FDA approved. That means they haven't gone through the same large studies and quality testing as commercial products. A 2020 review by the National Academies of Sciences found there isn't enough research to show compounded hormones are safer or more effective than FDA-approved ones. Anyone who tells you they're "risk-free" or "all natural, so no side effects" isn't giving you the whole picture.

So why use them at all? Because sometimes a standard product doesn't fit. Compounding lets us:

• Fine-tune doses that commercial products don't come in
• Combine several hormones into one cream
• Offer hormones without an FDA-approved version for women, like low-dose testosterone and DHEA
• Avoid dyes, fillers, or ingredients you're sensitive to

At Abbott Health & Wellness, compounded creams are one tool we use, but not the only tool.

How We Prescribe and Monitor BHRT at Abbott

Hormones are powerful, so how they're prescribed matters. Here's what you can expect:

1. A full picture first. We start with your symptoms, health history, and comprehensive labs. Hormones are only one piece of how you feel, so we also look at thyroid, iron, metabolic health, and more. See what blood tests to get before starting hormone therapy.
2. A plan built for you. Based on your results, we choose which hormones you need, in what form, and at what dose. That may be a compounded cream, an FDA-approved product, or a combination.
3. Protecting your uterus. If you still have your uterus and use estrogen, the right form and dose of progesterone is non-negotiable. It protects the uterine lining, and we'll make sure your plan does exactly that.
4. Regular follow-up. We recheck labs and symptoms, then adjust your dose as your body responds.
5. Ongoing screening. Hormone therapy goes hand in hand with staying current on mammograms and other routine care.

The Bottom Line

Bioidentical hormone replacement can be a flexible, personalized way to treat symptoms like hot flashes, poor sleep, low libido, and mood changes. Applying estrogen through the skin also avoids the extra clot risk linked to oral estrogen. Whether you use a cream, a capsule, an injection, or a combination, BHRT works best with careful dosing, regular labs, and a provider who knows when an FDA-approved option makes more sense. Learn more about hormone therapy at Abbott, menopause and perimenopause care, and whether hormone therapy is safe, or book a consultation and we'll build a plan around you.

Sources

• Vinogradova et al., hormone replacement therapy and risk of blood clots, BMJ, 2019
• National Academies report on compounded bioidentical hormone therapy, 2020
• PBS NewsHour: why menopause is often stigmatized and ignored

This page is for general information and does not constitute medical advice. Treatment recommendations are individualized and confirmed at your consultation. — Abbott Health & Wellness, 45 North State Street, Salina, UT 84654.