Bioidentical hormones: what "natural" actually means

"Bioidentical" is a chemistry word, not a safety rating. It means the hormone in the medicine has exactly the same structure as the one your ovaries make. Estradiol is bioidentical. Progesterone is bioidentical. Your body cannot tell the difference between the molecule from a pharmacy and the one it made in your 30s.

That is also why "bioidentical" does not mean "risk-free". If a molecule works like your own estrogen, it carries the same benefits and the same cautions as estrogen. The real questions are: what dose, through what route, how well is it made, and is it tested?

The word got popular through marketing, often paired with "natural" and "customised". Some clinics in the Philippines now sell compounded hormone packages under that banner. We do not link to them, and here is why.

You do not need a special clinic to get bioidentical hormones. The main ones are FDA-registered, made to pharmaceutical standards, tested for consistent dosing, and sold at Watsons with a prescription:

• Estradiol gel 0.06% (Oestrogel): ₱1,185.50 per 80 g pump pack (Watsons). A transdermal gel you rub on the skin. Same estradiol as your ovaries make.
• Micronized progesterone 200 mg (Utrogestan): ₱85.75 per capsule (Watsons). Body-identical progesterone, ground fine so it absorbs.
• Micronized progesterone 200 mg (Heragest): ₱76.50 per capsule (Watsons).

Prices checked October 2026.

Put together, estradiol gel plus micronized progesterone is the "bioidentical" regimen many people are hoping to find. The difference is that these products come with a leaflet, a known dose, a batch number, and a regulator watching them. See the full list of options on HRT for menopause, and monthly totals for example regimens on costs.

If you still have a uterus, estrogen needs a progestogen alongside it to protect the womb lining. That is true whether the estrogen is registered or compounded.

Compounding means a pharmacist mixes a medicine to order instead of dispensing a factory-made product. In menopause care this is usually:

• creams or gels with estradiol, estriol, progesterone or testosterone in custom strengths
• troches (lozenges that dissolve in the mouth)
• pellets placed under the skin that release hormones over months

These products are not individually registered or tested the way a branded medicine is. Each batch is made by hand, so the dose can vary from what the label says.

The Menopause Society (2022 hormone therapy position statement) raises these concerns about compounded bioidentical hormone therapy:

• minimal government oversight
• inconsistent dosing between batches
• possible impurity or sterility problems
• little data on whether they work or are safe
• no standardised risk labelling, so users may not get the warnings that come with registered HRT

Its bottom line: when an approved product exists, use the approved product.

ACOG Clinical Consensus No. 6 (2023), "Compounded Bioidentical Menopausal Hormone Therapy", says compounded bioidentical hormones should not be prescribed routinely when FDA-approved formulations exist, and that evidence for the marketing claims of safety and effectiveness is lacking (abstract).

Pellets are a particular worry. A pellet keeps releasing hormone for roughly 3 to 6 months, so the dose cannot easily be adjusted or stopped once it is in, and blood levels can be unpredictable. There is no FDA-approved estradiol pellet in the US (Blue Cross NC medical policy).

Saliva tests used to "customise" a compounded dose are unreliable: the Australasian Menopause Society notes they are not standardised and not quality controlled. Doctors adjust menopause HRT mostly by how you feel, not by chasing a blood or saliva number.

Compounding is legal in the Philippines, but only by the right people. Under the Philippine Pharmacy Act (RA 10918):

• Compounding and dispensing must be done by registered pharmacists following good manufacturing, laboratory and dispensing practice (Sec. 30).
• Prescriptions may be filled and compounded only by registered pharmacists (Sec. 33).
• Compounding without proper supervision is a punishable offence, with fines in the hundreds of thousands of pesos and possible imprisonment (Sec. 45).

We did not find an FDA Philippines circular specific to compounded hormones. Separately, the FDA does not allow prescription medicines to be sold online except by licensed drugstores with a physical outlet, so a compounded "hormone kit" sold through social media or a website with no pharmacy behind it is a red flag.

Compounding is a doctor's tool for genuine gaps, not a lifestyle upgrade. Reasonable examples:

• an allergy to an ingredient (excipient) in every registered product, such as soy in progesterone capsules: the Utrogestan leaflet says not to take it if you are allergic to soy (Pharmac NZ)
• a dose or form that is truly not available in the Philippines, after registered options have been tried

In those cases your doctor writes a specific prescription and a registered pharmacist prepares it. That is the exception, not the starting point. Notice that "it's more natural" and "it's customised to your hormones" are not on the list.

If someone offers you a hormone package, these questions sort the careful from the salesy:

1. Is this an FDA-registered product, or compounded? If compounded, why is a registered product not suitable for me?
2. Who compounds it, and where? Ask for the name of the registered pharmacist and the licensed pharmacy.
3. What exactly is the dose, and how do you know each batch matches it?
4. If I have a uterus, how is my womb lining protected? Estrogen without enough progestogen raises the risk of endometrial cancer.
5. Are you using saliva tests or pellets? Saliva tests are not standardised (Australasian Menopause Society), and a pellet cannot easily be stopped once it is in.
6. What are the risks? If the answer is "none, because it's natural", walk away.
7. Can I stop or change the dose easily?

You deserve the same honesty from a wellness clinic that you would get from a pharmacy leaflet. If you want help finding a doctor who prescribes registered HRT, start at find a doctor or read how to talk to your doctor.