Hormone pellets are heavily marketed, and the pitch is appealing: a quick in-office procedure every few months, no daily cream or patch to remember, and the promise of steady hormone levels. Patients ask about them often, and some arrive at ForwardFlow Health having already had pellets placed elsewhere. This article explains how pellets work, what the evidence and major medical societies say about them, and why we have chosen to use only adjustable delivery methods for hormone therapy.

What Pellets Are

Pellets are small cylinders of compressed hormone, usually testosterone, sometimes estradiol, roughly the size of a grain of rice. They are inserted under the skin of the hip or buttock through a small incision, and they dissolve slowly over three to six months. Pellets are compounded products; there is no FDA-approved hormone pellet for women in the United States. The dose a patient receives is fixed at the moment of insertion and cannot be changed until the pellet has fully dissolved.

The Case Pellet Clinics Make

To be fair to the argument, pellets do have a real advantage: convenience. There is nothing to apply, nothing to forget, and no transfer risk to a partner or child from a cream. Some women who have had poor absorption from creams report feeling better on pellets. And because pellets typically deliver large doses, many women notice a strong initial effect on energy and libido. That strong effect is also where the concerns begin.

What the Evidence and Guidelines Say

The largest study to date comparing pellet therapy with FDA-approved hormone therapy, published in the journal Menopause in 2021, followed several hundred women and found that those treated with pellets had testosterone levels several times higher than the upper limit of the normal female range, and estradiol levels many times higher than with standard therapy. Women on pellets had substantially higher rates of abnormal uterine bleeding, breast tenderness, acne, hair growth, mood swings, and weight gain, and were more likely to require a hysterectomy during the study period.

Major medical societies have responded. The Menopause Society, the American College of Obstetricians and Gynecologists, and the Endocrine Society have all advised against compounded pellet therapy, citing unpredictable dosing, supraphysiologic hormone levels, lack of safety data, and the inability to adjust or reverse the dose. The 2019 international consensus statement on testosterone for women specifically recommended against pellets and in favor of transdermal preparations. Read more about the evidence on hormone therapy safety.

The Four Problems with Pellets

1. The dose cannot be adjusted

Hormone therapy is a process of finding the lowest dose that resolves your symptoms, and that dose is not known in advance. With a cream, patch, or troche, your provider rechecks your labs after a few weeks and moves the dose up or down. With a pellet, if the dose is too high, you live with the side effects for months; if it is too low, you wait months for the next insertion.

2. The dose cannot be reversed

If you develop a side effect, a new diagnosis, or simply decide hormone therapy is not for you, a cream or patch is stopped the same day and levels fall within days. A pellet cannot be removed once inserted; the hormone continues to release until it is gone. This matters most for the rare but serious situation of a new breast cancer diagnosis while on therapy.

3. Levels are unpredictable and usually too high

Pellets release hormone fastest in the first weeks and taper unevenly, producing a peak that often lands far above the female range and a trough near the end that brings symptoms back. The result is a cycle of feeling great, then feeling worse, then chasing the next pellet, which some clinicians have compared to the pattern seen with addictive substances. Sustained testosterone levels above the female range are what cause voice deepening, clitoral enlargement, and scalp hair loss, effects that can be permanent.

4. Estradiol pellets carry an added uterine risk

When estradiol is delivered at high, unpredictable levels, the uterine lining can thicken without adequate progesterone protection, leading to abnormal bleeding and, over time, an increased risk of endometrial hyperplasia. This is the mechanism behind the higher hysterectomy rate observed in the 2021 study.

What ForwardFlow Health Uses Instead

Every delivery method we prescribe shares one quality: it can be changed quickly.

• Transdermal creams and gels: Applied daily to the skin. The preferred route for testosterone in the international consensus statement and, for estradiol, the route with the lowest clotting risk. Doses are adjusted by changing the amount applied.
• Patches: FDA-approved estradiol patches changed once or twice weekly deliver a steady, predictable dose and are often covered by insurance.
• Sublingual troches: Dissolved under the tongue; convenient for women who prefer not to use a cream.
• Oral micronized progesterone: Taken at bedtime, where its calming effect helps sleep.
• Injections: Available in select cases where other routes are not suitable, at small, frequent doses to limit swings.

With each of these, your labs are rechecked a few weeks after starting and periodically thereafter, and the dose is fine-tuned to keep you within the physiologic range where benefits are greatest and side effects rare. See which labs we check and how often.

If You Have Had Pellets Before

Many women come to us after pellet therapy, either because they felt over-treated, because symptoms returned between insertions, or because they want a more controlled approach. We can help. The first step is baseline labs to see where your levels are, since residual pellet hormone can persist for months. From there, an adjustable regimen is started at a conservative dose and titrated as the pellet effect fades. Women often describe the transition as trading a rollercoaster for a steady road.

Frequently Asked Questions