Estradiol vs Estriol, is one a better choice for Menopause treatment? An HRT patient's Review
- Peggy B. - Experienced HRT Patient Reviewer
- Aug 3
- 5 min read
Medical Disclaimer & 2026 Update: I am a patient sharing my personal journey with Bioidentical Hormone Replacement Therapy (BHRT). This review is for informational purposes and is not medical advice. Following the February 2026 FDA update regarding HRT labeling and compounding transparency, I have updated this post to reflect my latest labs and clinical discussions with my provider. Always consult a licensed professional before starting any hormone protocol.
If you’ve been following my journey, you know I’ve been on HRT since 2019—and honestly, it’s been a game-changer. It saved my husband from my perimenopausal rage, put an end to the night sweats and hot flashes, helped me shed a few stubborn pounds, and gave me my sanity back. More than that, it gives me confidence knowing it’s actively protecting my heart, bones, and brain as I head into my 60s.
With perimenopause and menopause finally getting the spotlight they deserve, HRT is a huge topic of conversation right now. But treatment isn't one-size-fits-all—there are endless opinions on when, how, and for whom it should be prescribed.
Whether it's right for you is a personal decision to explore with a trusted specialist. Do your homework, ask the hard questions, and make the choice that best serves your body.
Estrogen Explained - Estriol vs. Estradiol
Estrone (E1)
Primary Phase: The main type of estrogen found in the body after menopause.
Production Site: Produced primarily in peripheral tissues like adipose (fat) tissue and muscle from precursor hormones.
Potency: Weaker in estrogenic activity compared to estradiol.
Estradiol (E2)
Primary Phase: The dominant and most potent form of estrogen during a woman's reproductive years.
Production Site: Synthesized and secreted primarily by the ovaries.
Potency: The strongest and most abundant active estrogen, responsible for regulating the menstrual cycle and supporting general reproductive health.
Estriol (E3)
Primary Phase: The principal and most abundant form of estrogen produced during pregnancy.
Production Site: Synthesized largely by the placenta to support fetal development and the health of the uterus.
Estradiol & Estriol: Side by Side
Feature | Estradiol (E2) | Estriol (E3) |
Primary receptor | ERα — breast, uterus, reproductive organs | ERβ — hippocampus, cerebral cortex, nervous system |
Vasomotor symptoms | Strong evidence. FDA-approved for hot flashes, night sweats, bone density. | Effective for hot flashes and sleep. Not the primary design goal. |
Cognitive symptoms | Not shown to be specifically neuroprotective in major clinical trials.[2] | Improved processing speed vs. placebo in MS trials; preclinical reversal of hippocampal atrophy in menopause model. |
Breast tissue stimulation | Strong ERα binding. Associated with breast tissue proliferative effects in long-term use. | Weak ERα binding. 40+ years of European use without increased breast cancer risk at therapeutic doses. |
Estrone conversion | Oral estradiol converts to estrone, associated with increased clotting risk. | Oral estriol does not convert to estrone. |
FDA approval (US) | Yes. Multiple approved formulations. | No. Available through compounding pharmacies only. |
Clinical history | Decades of US prescribing data. Women’s Health Initiative and subsequent reanalysis. | 40+ years of prescribing in Europe and Asia. |
Reversibility | Oral and transdermal forms clear the system within days of discontinuation. | Clears system within days. No implanted or pellet format. |
What is Biest Cream?
Biest could be a ratio of 50/50 of estriol to estradiol or it could be a 80/20. This means 80% of the product is estriol and 20% is estradiol. Some Biest creams might also include progesterone or progesterone tablets might be prescribed if you still have a uterus.
Biest Active Ingredients: Combines estriol (E3) (a weaker, milder estrogen) with estradiol (E2) (the body's most potent natural estrogen).
Primary Uses: Eases hot flashes, night sweats, and vaginal dryness.
Route: Absorbed directly through the skin or applied vaginally to avoid first-pass liver metabolism.
Could Estriol be the Safer Estrogen?
Estriol is often called the "safer" estrogen because it is the weakest form and has a lower risk of blood clots, but it is not entirely risk-free. It is much less potent than estradiol, meaning it has a milder effect on the body.
Lower Potency: Estriol is significantly weaker than estradiol and estrone, leading to fewer systemic side effects at low doses.
Blood Clot Risk: It appears less likely to cause dangerous blood clots (venous thromboembolism) compared to oral estradiol.
Tissue Stimulation: Continuous or high doses can still cause growth in the uterine lining or affect breast tissue.
Regulation Status: In the United States, estriol is not FDA-approved as a standard prescription drug for humans and is mainly available through specialized compounding pharmacies, whereas FDA-approved options like low-dose estradiol cream are extensively studied.
Should I use Estriol or Estradiol?
That is a question best answered by you and your Hormone Therapy provider. Much of the answer will depend on your health history and your goals.
I can can tell you for me, in my early years of perimenopause and transitioning into menopause, the Biest didn't seem to have as much of an effect on my hot flashes and night sweats as straight estradiol did, but now that I'm going on eight years into menopause, I often wonder if I should consider a product that is a combo of estradiol and estriol? I recently had a very well known HRT social media influencer mention that in her findings, biest is thought to be more protective than estradiol alone.
I had never heard that from any of the HRT providers I had visited, until her and it made me think. Is there a point in our menopause journey and based on health condition that we should look to biest rather than estradiol alone.
Is Estriol FDA Approved? No, it's not.
Estradiol is FDA approved and has been for quite some time. It seems that when big pharma had to decide which one they wanted to put in front of the FDA, it was the stronger of the two, Estradiol that they choose to bet on and spend the dollars needed for the studies and testing required by the FDA to get it approved.
Where to get Biest Cream?
Biest Cream isn't available from every HRT provider, but there are several who do offer this, if you are looking for HRT that is considered a milder treatment. All of the providers noted below offer a Biest Topical cream that can be rubbed on your inner arms or inner thighs.
If you've never tried HRT before and want to start with something that's considered a gentler HRT formulation, you can get biest from all three providers.
Winona (35% off using this link)
See my Trusted Providers Page to see all of the HRT Providers that I have tried.
Estradiol vs Estriol, is one a better choice for Menopause treatment? An HRT patient's Review
Do your homework and be prepared with quesitons before you sit down with your HRT provider. Understanding the different types of estrogen, their jobs throughout our lives as women and knowing what goals you have for your HRT journey will help you and your HRT clinician better determine which estrogen and which formulation is best for you.
Also, be open minded, if you start out with Biest and find it's not strong enough to relieve your symptoms then you may have to try something with a larger concentration of Estradiol. All of us are different and what works for one may not work for another. Give any new prescripiton 90 days to really see the results before you opt to try something different.
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