“Bioidentical” and “synthetic” are often used as marketing terms, but the medically important questions are more specific: What hormone is being used? Is the product FDA approved or compounded? What is the indication, dose and route? What evidence supports it for this patient?
What Does Bioidentical Hormone Mean?
A bioidentical hormone has a chemical structure identical to a hormone produced by the human body. Estradiol and micronized progesterone are examples used in FDA-approved prescription products. Therefore, “bioidentical” does not automatically mean “compounded.”
Are FDA-Approved Bioidentical Hormones Available?
Yes. FDA-approved products containing estradiol or micronized progesterone are available in several formulations.
What Are Compounded Bioidentical Hormones?
Compounded medications are prepared for individual patient needs under applicable compounding rules. They are not FDA approved, which means FDA does not review them before marketing for safety, effectiveness or quality. Compounding can serve an important medical need in selected patients, but compounded treatment should not automatically be described as safer, more natural or more effective.
Are Compounded Hormones Safer Than FDA-Approved Hormones?
There is not evidence that compounded bioidentical hormones are categorically safer than FDA-approved hormone therapy. Risks depend on the hormone, dose, route, patient characteristics and treatment indication.
What Does “Synthetic Hormone” Mean?
The term is imprecise. Some people use it for any manufactured hormone, even when the molecule is chemically identical to endogenous hormone. It is more useful to identify the exact medication than to choose treatment based on the word “synthetic.”
Are Saliva Tests Useful for Customizing Compounded Hormones?
Hormone testing should be ordered when it answers a clinical question. Hormone levels can fluctuate, particularly during perimenopause, and treatment should not be based on a marketing promise that a single saliva result can identify a uniquely “perfect” compounded dose.
FDA-Approved vs. Compounded: What Should Patients Compare?
Ask about the exact active ingredient, indication, formulation, dose, route, evidence, regulatory status, pharmacy source, monitoring plan, cost and whether an FDA-approved option can meet the same clinical need.
Bioidentical Hormones and Menopause
For menopause, treatment should be individualized according to symptoms, age, time since menopause, whether the uterus is present, medical history and risk factors. FDA-approved estradiol and micronized progesterone may be options for appropriately selected patients.
Frequently Asked Questions
Is bioidentical HRT more natural?
“Natural” is not a regulatory or safety category. The exact molecule, formulation, dose and evidence matter more than a marketing label.
Do bioidentical hormones have side effects?
Yes. A hormone can have physiologic effects and risks regardless of whether it is described as bioidentical.
Does insurance cover bioidentical hormone therapy?
Coverage varies by plan and product. FDA-approved prescription products and compounded preparations may be handled differently by insurers.
Read our Bioidentical Hormone Therapy, Menopause Treatment, and Hormone Replacement Therapy pages. For guidance on scheduling doses, see our best time of day to take bioidentical hormones guide.
