Biest cream is a compounded prescription estrogen cream that combines two bioidentical estrogens, estriol (E3) and estradiol (E2), in one base. Clinicians prescribe it for perimenopause and menopause symptoms like hot flashes, night sweats, and vaginal dryness. "Bi-est" means two estrogens.

Key takeaways

  • Biest is two bioidentical estrogens (estriol plus estradiol) in a compounded cream.
  • Compounded biest cream is not FDA-approved; major bodies (ACOG, The Menopause Society) prefer FDA-approved options where one exists.
  • "80/20" and "50/50" describe the estriol-to-estradiol ratio, not the strength. Strength is set separately in mg/gm.
  • The best evidence (Sood 2013) shows compounded creams often deliver less estradiol than a patch, so a conservative dose is titrated upward.
  • It carries real estrogen-therapy risks: blood clots, stroke, breast cancer. A physician should review your history first.

If you have been researching hormone options, you have probably run into the word "biest" and a lot of conflicting takes. This page is the straight version: what biest cream actually is, how the ratios and doses work, what is known about safety, and where the evidence is genuinely thin. Therisse is a physician-led practice, so the goal here is accuracy, not persuasion.

What is biest cream made from?

Biest cream contains two estrogens that are structurally identical to the ones your body makes:

  • Estriol (E3): the weaker estrogen, the larger share of most biest formulas.
  • Estradiol (E2): the stronger, more biologically active estrogen.

These are "bioidentical," meaning the molecules match human hormones rather than being chemically altered. The active ingredients are synthesized from plant sources (commonly soy or wild yam) and then compounded by a licensed pharmacy into a cream you apply to the skin. Therisse's biest is dispensed by a licensed 503A compounding pharmacy after a prescription from a board-certified physician.

For women who still have a uterus, estrogen is paired with progesterone to protect the uterine lining. Estrogen alone in that situation raises the risk of endometrial overgrowth.

Is biest cream FDA approved?

No. Compounded biest cream is not FDA-approved. This is important and often misunderstood, so to be precise: the FDA approves specific manufactured drug products, and it does approve certain estradiol products (patches, pills, gels). It does not approve compounded biest cream, because compounded preparations are made for an individual patient and are not reviewed or approved as standardized products.

That does not make compounding illegal or fringe (503A compounding is a long-established, regulated practice), but it does mean biest cream has not gone through the FDA's premarket testing for safety, efficacy, and consistent dosing. It is also worth knowing where the major medical bodies stand: the American College of Obstetricians and Gynecologists (ACOG), The Menopause Society, and the National Academies of Sciences, Engineering, and Medicine recommend FDA-approved hormone therapies over compounded ones when an FDA-approved option exists, and note that "bioidentical" is partly a marketing term. Anyone telling you compounded biest is "FDA-approved" is simply wrong.

Biest cream ratios: 50/50 vs 80/20

The two numbers are the proportion of estriol to estradiol.

Ratio Estriol : Estradiol Notes
80/20 80% estriol / 20% estradiol The classic ratio. Leans on the weaker estrogen (estriol), with a smaller share of active estradiol.
50/50 50% estriol / 50% estradiol A higher relative share of the stronger estrogen (estradiol).

The ratio describes the mix; the strength is set separately, written as mg per gram (for example, a "2.5 mg/gm" cream). So "biest 80/20 2.5" means an 80/20 ratio at 2.5 mg of total estrogen per gram. Therisse's standard starting formulation is biest 80/20 at 2.5 mg/gm, a deliberately conservative starting point chosen because, with compounded creams, the more common problem is under-treatment rather than over-treatment. If symptom relief is incomplete, the clinical move is to step the strength up, not to start high.

Biest cream dosing: how it is used

Biest cream is typically applied once daily to thin-skinned areas (inner forearms, inner thighs) where absorption is reasonable. A common starting amount is around half a gram per day, though the exact amount depends on the prescribed strength and your physician's plan.

A few honest points on dosing:

  • There is no single validated "correct" starting dose for compounded biest. Major bodies (The Menopause Society, ACOG) decline to publish one and generally steer toward FDA-approved estradiol products first.
  • Because of that, a reputable practice picks a defensible conservative starter and adjusts based on how you respond, rather than pretending a precise number is settled science.
  • Rotating application sites and applying to clean, dry skin helps with more consistent absorption.

How long does biest cream take to work?

Symptom relief is usually gradual, not overnight. For hormone therapy generally, relief from hot flashes is often felt within the first three to four weeks, and if bothersome symptoms persist past that, raising the estrogen dose is a standard next step. Sleep and mood changes can take longer. Individual response varies widely, which is exactly why follow-up and dose adjustment matter.

Biest cream side effects

Most side effects are the familiar ones for estrogen therapy, and they often settle as your body adjusts or the dose is refined:

  • Breast tenderness or swelling
  • Spotting or breakthrough bleeding
  • Headache
  • Nausea
  • Skin irritation at the application site
  • Bloating or fluid retention

On weight: there is no good evidence that biest cream reliably causes weight gain. Menopause itself shifts body composition, which is often what gets attributed to the cream.

Serious risks you should know

Estrogen-containing hormone therapy carries real, established risks. These include blood clots, stroke, and breast cancer. Risk depends on your age, health history, the type and route of hormone, and how long you use it.

On clot risk specifically, route matters: large observational research (the ESTHER study) found that oral estrogen raised the risk of venous blood clots while transdermal (through-the-skin) estrogen did not show the same increase, likely because skin-applied estrogen skips the liver "first pass" that drives clotting factors. This is reassuring context, not a guarantee of safety, and the compounded-cream evidence base specifically is limited. A physician reviews your history (including any personal or family history of clots, stroke, or hormone-sensitive cancers) before prescribing.

Biest cream vs the estradiol patch

This is where honesty matters most. An FDA-approved estradiol patch delivers a known, consistent amount of estradiol that has been studied and standardized. Compounded biest cream has not been standardized the same way.

The one randomized pharmacokinetic trial most often cited (Sood and colleagues, Maturitas, 2013, a 40-woman study) found that compounded biest creams generally delivered less estradiol into the bloodstream than a standard estradiol patch, with one important exception: at the highest cream strength tested (3.0 mg), blood levels were not statistically different from the patch. In other words, lower-strength creams tended to under-deliver, which is the practical reason a conservative starter is titrated upward rather than assumed to be "enough."

What that means practically:

  • If your priority is predictable, well-studied dosing, an estradiol patch has more data behind it.
  • Biest is often chosen for the estriol component and for people who prefer a customizable cream, accepting that delivery is less precisely characterized.
  • The honest limit: "amount of cream applied" does not map cleanly to "amount of estradiol absorbed" in the published literature for any compounded cream. Anyone who gives you an exact patch-equivalent for a biest cream is overstating what is known.

How Therisse handles biest

Therisse is physician-led. A board-certified physician reviews your intake and history before anything is prescribed, and the cream is dispensed by a licensed 503A compounding pharmacy. In practice that means we start at a conservative, defensible strength (biest 80/20 2.5 mg/gm) and adjust based on how you respond, rather than starting high or leaving the dose to guesswork.

Prescription products require an online consultation with a licensed provider. If a physician does not approve you, your initial consult fee and any medication charge are refunded in full.

Compounded products are not FDA-approved. This page is educational and is not medical advice. Hormone therapy is not right for everyone, and it carries risks including blood clots, stroke, and breast cancer. Talk to a licensed clinician about your individual history.

Frequently asked questions

What is biest cream used for? Relief of perimenopause and menopause symptoms, most commonly hot flashes, night sweats, and vaginal dryness, using two bioidentical estrogens (estriol and estradiol).

Is biest cream safe? It can be appropriate for some women but carries the established risks of estrogen therapy (blood clots, stroke, breast cancer), and the compounded-cream evidence base is limited. Safety depends on your personal history, which is why a physician reviews it first.

Is biest cream bioidentical? Yes. Both estrogens in it (estriol and estradiol) are structurally identical to the hormones your body produces. "Bioidentical" is not the same as "FDA-approved," and compounded biest is not FDA-approved.

What is the difference between 50/50 and 80/20 biest? The ratio of estriol to estradiol. 80/20 is mostly the weaker estrogen (estriol); 50/50 has an equal share of the stronger estrogen (estradiol). Strength (mg/gm) is set separately from the ratio.

Does biest cream cause weight gain? There is no reliable evidence that it does. Weight changes around menopause are common on their own.

How long until biest cream works? Often three to four weeks for early hot-flash relief, with fuller effect as the dose is adjusted. Response varies.

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