"Bioidentical" hormones are hormones with the same molecular structure as the ones the body makes, such as estradiol and progesterone. Research on menopause hormone therapy most consistently reports relief of hot flashes and night sweats. It also carries risks that depend on the hormone, the route, your age and your health history, so it is not right for everyone, and a physician assessment decides whether any treatment is appropriate.
This article is general health education. It is not a recommendation to start, change or stop any medication.
What does "bioidentical" actually mean?
The word describes chemistry, not safety. A bioidentical hormone has the same structure as a human hormone: estradiol is the main estrogen made by the ovaries, and progesterone is the hormone made after ovulation. Older forms of hormone therapy used different molecules, such as estrogens derived from animal sources or synthetic progestins, which act on the same receptors but are not identical.
Bioidentical hormones are available in two very different ways:
- Regulated pharmaceutical products, made to a standard dose and studied in clinical trials (for example, estradiol patches or gels and oral micronized progesterone).
- Custom-compounded preparations, mixed by a pharmacy for one person. Their strength and purity are not tested the way regulated products are, and they have not been studied in large trials.
Clinical guidelines on menopause generally state that compounded hormones should not be considered safer or more effective than regulated products, and that saliva testing is not a reliable way to set a dose.
What benefits does research report for menopause hormone therapy?
The evidence is strongest for a few specific symptoms, and much weaker for broad "anti-aging" claims:
- Hot flashes and night sweats. Randomized trials consistently report that estrogen-based therapy reduces how often and how strongly they occur.
- Vaginal dryness and discomfort. Low-dose vaginal estrogen is studied for these genitourinary symptoms of menopause.
- Bone density. Trials report slower bone loss while therapy is taken; this is not the same as a recommendation to use hormones for bone health alone.
Effects on mood, sleep, energy, skin or weight are reported less consistently, and individual experience varies. Hormone therapy is not a proven treatment for aging itself.
What are the risks?
The risks depend on which hormones are used, how they are taken, and when therapy starts. Findings reported in the Women's Health Initiative trials (JAMA, 2002) and later analyses include:
- Blood clots and stroke, with oral estrogen associated with a higher clot risk than transdermal routes in observational studies (BMJ, 2019).
- Breast cancer, where combined estrogen-plus-progestogen therapy has been associated with a small increase in risk that grows with longer use (The Lancet, 2019).
- Endometrial cancer, if estrogen is taken without a progestogen by someone who still has a uterus.
- Gallbladder disease.
Some observational studies report differences between progesterone and synthetic progestins for breast cancer risk (Breast Cancer Research and Treatment, 2008), but these were not randomized trials, and the finding has not been confirmed as a reason to prefer one product for a given person.
Who should not use hormone therapy?
Hormone therapy is generally not used by people with:
- A current or past breast cancer or other hormone-sensitive cancer
- A history of blood clots in the legs or lungs, stroke or heart attack
- Active liver disease
- Unexplained vaginal bleeding
- Pregnancy
Other conditions, such as migraine with aura, high blood pressure or a strong family history of breast cancer, need careful discussion with a physician.
How is a decision about hormone therapy usually made?
A physician typically reviews your symptoms, how much they affect daily life, your age and time since menopause, your personal and family medical history, blood pressure, and any screening that is due. Non-hormonal options and lifestyle measures are part of the same conversation. If therapy is started, it is reviewed regularly.
Dr. Charles Jiang, a licensed physician in British Columbia, is RAAC's lead physician. Whether any hormone treatment is appropriate for you is a decision for you and your own physician after a proper assessment.
Frequently Asked Questions
Are bioidentical hormones safer than other hormone therapy?
Not automatically. "Bioidentical" describes the molecule, not the risk. Regulated bioidentical products have their own studied risks, and custom-compounded versions have not been tested in large trials.
Do I need saliva or hormone-panel testing before therapy?
Clinical guidelines generally do not recommend saliva testing to set doses, and menopause is usually diagnosed from age and symptoms. Your physician will decide which tests, if any, are needed.
How long do people stay on hormone therapy?
There is no single answer. Duration is reviewed regularly with a physician, weighing symptoms against risks.
Where can I talk about menopause symptoms in Richmond?
Your family doctor or another physician is the right place to start. Bring a list of your symptoms, medications and family history.
This article is general education from Richmond Anti-Aging Clinic in Richmond, BC, and does not replace individual medical advice.
