“My friend and I are both going through menopause. She’s feeling much better after starting hormone therapy, but I’m still experiencing night sweats, poor sleep and mood changes. Why isn’t the same treatment working for me?”
Or perhaps your experience is different:
“I started hormone replacement therapy when I was around 50. My hot flashes improved, but I’ve gained a significant amount of weight since starting treatment. Could my hormone therapy be contributing to the weight gain? Do I need a different dose or formulation?”
These two experiences raise an important question: Why do women respond differently to hormone replacement therapy (HRT)?
The answer is that hormone therapy isn’t one-size-fits-all. Even women of the same age can experience very different menopausal symptoms, respond differently to treatment and have different medical needs.
Personalized hormone therapy focuses on finding an appropriate treatment based on your symptoms, medical history, treatment goals and individual risk factors. But what does personalization actually mean? And where do bioidentical hormones and customized compounding fit into the picture?
Why Doesn’t the Same Hormone Dose Work for Everyone?
During perimenopause, estrogen and progesterone levels can fluctuate considerably. As women transition into menopause, estrogen levels generally decline, contributing to symptoms such as hot flashes, night sweats, vaginal dryness and sleep disturbances.
However, hormone levels are only part of the picture. Your response to treatment may also depend on your stage of menopause, the severity of your symptoms, your medical history and how your body absorbs and processes medication.
For example, one woman may experience significant relief from hot flashes with a standard estradiol patch, while another may require a different dose or delivery method to achieve adequate symptom control. Some women may also experience adverse effects that require their treatment to be reassessed.
The goal of personalized hormone therapy is not necessarily to prescribe more hormones, but to find an effective treatment at an appropriate dose while minimizing potential risks and side effects.
Importantly, personalization doesn’t always require compounding. Commercially manufactured hormone medications are available in different strengths and formulations, allowing healthcare professionals to adjust treatment for many patients.
What Are Bioidentical Hormones?
When researching personalized hormone therapy, you may come across the term bioidentical hormones.
Bioidentical hormones are hormones that have the same molecular structure as hormones naturally produced by the human body.
For example, bioidentical estradiol has the same chemical structure as the estradiol produced by the ovaries. This distinguishes it from certain synthetic estrogen compounds that have different molecular structures. They usually come from yam or soybeans.
One common misconception is that all bioidentical hormones are specially compounded or naturally extracted from plants. In reality, many commercially manufactured prescription medications already contain bioidentical hormones, including estradiol and micronized progesterone.
The term bioidentical describes the hormone’s chemical structure. It does not automatically mean the medication is safer, more effective or better absorbed than other hormone treatments.
Bioidentical Progesterone vs. Synthetic Progestins: Does the Difference Matter?
Not all hormones used in HRT are chemically identical. Bioidentical progesterone, also known as micronized progesterone, has the same molecular structure as the progesterone naturally produced by the body. In contrast, synthetic progestins, such as medroxyprogesterone acetate (MPA), are chemically modified compounds that act on progesterone receptors but may have different effects on other tissues.
Interestingly, research suggests that these differences may influence the safety profile of hormone therapy. A 2009 review examining bioidentical progesterone and synthetic progestins reported that natural progesterone may have a more favourable profile for certain cardiovascular and breast health outcomes. More recent observational studies have also suggested that micronized progesterone, when combined with estrogen, may be associated with a lower risk of breast cancer and blood clots compared with some synthetic progestins.
However, these findings do not mean that bioidentical progesterone is completely risk-free or that all synthetic progestins carry the same risks. The evidence varies by the specific medication, and long-term randomized trials directly comparing these treatments remain limited.
The takeaway? The type of progesterone used in HRT matters, not just the dose. Understanding these differences allows healthcare professionals to select a hormone regimen based on each patient’s medical history, treatment goals and individual risk factors.
When Can a Compounding Pharmacy Play a Role in Hormone Replacement Therapy?
Commercially available hormone treatments are suitable for many women and are generally preferred when they meet a patient’s needs. However, because these medications are manufactured in standardized strengths and formulations, there may be situations where a patient’s specific requirements cannot be adequately addressed by available products.
This is where a compounding pharmacy may play a valuable role.
Customized Hormone Dosing
Commercial hormone products are available in predetermined strengths and delivery systems. For example, estradiol gels are manufactured to provide specific amounts of estrogen per measured dose. Although prescribers can adjust treatment using available products, some patients may require a strength or dosage form that is not commercially available.
When clinically appropriate, a compounding pharmacist can collaborate with the prescriber to prepare an individualized formulation.
This flexibility may be helpful when a patient has a specific dosing requirement that cannot be met using suitable commercially manufactured alternatives.
However, compounded hormone preparations do not necessarily deliver medication in the same way as approved products. Differences in formulation can affect absorption and consistency of dosing, so careful formulation design and clinical follow-up are important.
Avoiding Certain Inactive Ingredients
Medications contain more than just active hormones. They also include inactive ingredients, known as excipients, which may serve as preservatives, solvents, stabilizers, capsule materials or vehicles that help deliver the medication.
While these ingredients are important for medication quality and performance, some patients may have allergies, sensitivities or dietary restrictions that make certain products unsuitable.
For example:
- Gelatin: Patients following vegetarian, vegan or certain religious dietary practices may prefer gelatin-free capsules.
- Peanut or soy-derived ingredients: Some pharmaceutical products contain oils or other ingredients derived from these sources, which may require additional consideration for patients with relevant allergies.
- Sunflower-derived ingredients: Patients with a confirmed allergy or sensitivity to a particular ingredient may need a suitable alternative formulation.
A compounding pharmacist may be able to prepare a medication using alternative excipients, such as a plant-based capsule instead of gelatin or a different compatible vehicle when a specific ingredient needs to be avoided.
It is important to recognize that not every ingredient derived from an allergenic source contains clinically significant allergenic proteins. The specific ingredient, its refinement and the patient’s allergy history must be considered.
Personalized hormone therapy isn’t simply about adjusting the dose. It can also involve finding a formulation that accommodates a patient’s medical needs, tolerability and dietary preferences.
Whenever possible, suitable commercially approved alternatives should be considered first. If compounding is necessary, the formulation must be evaluated carefully because changes to inactive ingredients can influence medication stability, absorption and effectiveness.
Does Personalized Hormone Therapy Require Regular Hormone Testing?
Not necessarily.
During perimenopause, estrogen and progesterone levels can fluctuate considerably, sometimes even within the same menstrual cycle. As a result, a single hormone blood test may not accurately represent a woman’s hormonal status or explain the severity of her symptoms.
For many women receiving menopausal hormone therapy, treatment adjustments are guided primarily by symptom relief, tolerability and individual health factors rather than attempting to achieve a specific estrogen or progesterone level.
Routine saliva hormone testing is not recommended for determining or adjusting menopausal hormone therapy doses because it has not been shown to reliably guide treatment.
However, certain treatments, including testosterone therapy, may require blood testing to monitor hormone exposure and avoid excessive levels.
How Can Atria Compounding Pharmacy Help?
At Atria Compounding Pharmacy, we recognize that every patient’s medication needs are different.
Our compounding pharmacists work closely with prescribers to explore individualized hormone formulations when commercially available medications are not suitable. This may include preparing a specific prescribed strength, selecting alternative compatible excipients or developing an appropriate dosage form to accommodate individual patient requirements.
We also help patients understand their prescribed medications, proper administration, storage requirements and the importance of ongoing clinical follow-up.
Personalized hormone therapy is not about using more hormones or stronger formulations. It’s about finding a treatment that fits your individual needs while carefully balancing effectiveness, safety and tolerability.
If you have questions about customized hormone formulations, contact Atria Compounding Pharmacy to learn how our pharmacists can work with your healthcare provider to explore appropriate treatment options.
References
1. Holtorf K. The bioidentical hormone debate: are bioidentical hormones (estradiol, estriol, and progesterone) safer or more efficacious than commonly used synthetic versions in hormone replacement therapy? Postgrad Med. 2009;121(1):73–85. https://pubmed.ncbi.nlm.nih.gov/19179815/
2. American College of Obstetricians and Gynecologists (ACOG). Should I have hormone testing before starting hormone therapy? ACOG Women’s Health. Published December 2025.
3. Tang Y, Ma R, Zhang L, Sun X, Wang Y. Effectiveness and safety of hormone replacement therapy in the treatment of menopausal syndrome: a meta-analysis. Am J Transl Res. 2025;17(1):1–15. https://pmc.ncbi.nlm.nih.gov/articles/PMC11826161/