Pellet Therapy

Hormone pellet therapy places small implants of hormone, usually estradiol and sometimes testosterone, under the skin of the hip or buttock, where they release hormone for several months. It is widely marketed to women in menopause. Three facts are worth knowing before you choose it: no estradiol or testosterone pellet is FDA-approved for women, pellets are not designed to be removed, and medical societies recommend FDA-approved hormone therapy over compounded products when an approved option is available.

This page explains how pellets work, what the procedure involves, what the evidence does and does not show, and the questions worth asking before you agree to an insertion.

What is hormone pellet therapy?

A hormone pellet is a small solid cylinder of compressed hormone, roughly the size of a grain of rice. A clinician places one or more pellets in the fatty tissue under the skin, and the hormone is absorbed as the pellet slowly dissolves. For women, pellets may contain estradiol, testosterone, or both. Estradiol pellets and some testosterone pellets are compounded to a prescriber's order. Testopel is an FDA-approved testosterone pellet for certain conditions in males, but it is not approved for women or menopause.

How does pellet therapy work?

Once placed, a pellet keeps releasing hormone until it has dissolved, which takes several months. Clinics commonly schedule the next insertion every three to six months, depending on the hormones used and how symptoms respond. There is nothing to take or apply day to day, which is the main appeal. The flip side is that there is no simple way to lower the dose after insertion, because pellets are not designed to be removed.

Which hormones are used in pellets?

Estradiol is the hormone used to treat hot flashes, night sweats and other menopause symptoms. The same molecule is in FDA-approved patches, gels and sprays and pills; what differs with a pellet is the product and how it is delivered.

Testosterone is also commonly offered in pellet form. The 2019 Global Consensus Position Statement on testosterone for women found evidence for testosterone only for low sexual desire that causes distress after menopause, following a proper assessment, and it advises against pellets and injections because they can push levels above the normal female range. Testopel, the only FDA-approved testosterone pellet, is approved for specific testosterone-deficiency conditions in males, not for menopause. See testosterone for women for the preparations the consensus prefers.

If you still have a uterus, estrogen from a pellet needs a progestogen as well, usually oral micronized progesterone, to protect the lining of the uterus. A pellet alone does not provide that protection.

Are hormone pellets FDA-approved for women?

No. There are no FDA-approved estradiol or testosterone pellets for women. Compounded pellets used in menopause care are made by regulated compounding pharmacies, but the finished product is not reviewed by the FDA for safety, effectiveness or quality before it is dispensed. The FDA says it has no evidence that compounded "bioidentical" hormones are safer or more effective than approved hormone therapy. For more on the difference, see what bioidentical actually means.

What happens during pellet insertion?

• The skin over the upper buttock or hip is cleaned and numbed with a local anesthetic.
• The clinician makes a small cut, a few millimeters long.
• The pellets are placed in the fat under the skin through a small hollow tube called a trocar.
• The cut is closed with adhesive strips or a dressing.

Clinics typically advise keeping the site dry and avoiding strenuous lower-body exercise for a few days. Bruising, soreness, bleeding, infection and extrusion, where a pellet works its way back out through the skin, can occur. Contact the clinic if the area becomes increasingly red, hot, swollen or painful, or if you see a pellet coming out.

Can the dose be changed, or the pellets removed?

Not easily. Once pellets are in place they keep releasing hormone until they dissolve. If the dose turns out to be too high, if side effects appear, or if a new health problem means you should stop hormones, you usually have to wait for the pellets to wear off. Pellets are not designed to be removed, so they cannot be discontinued as easily as oral or topical therapy. This is one reason clinicians often suggest trying an adjustable form first, such as a patch or gel, so you know how you respond to a given dose.

What does the evidence show?

Estradiol is effective for hot flashes and night sweats. What pellets lack is the kind of evidence approved products have: large randomized trials of safety and long-term outcomes. The major hormone therapy trials, including the Women's Health Initiative, KEEPS and ELITE, used FDA-approved oral or transdermal estrogen, not pellets. The Endocrine Society notes that there are no comprehensive trials of compounded hormone therapy and has documented pellet users with hormone levels well above the expected range.

Some women using estradiol implants have reported symptoms returning while their blood levels were still high, which can lead to earlier repeat insertions and levels climbing higher still. Clinicians call this tachyphylaxis, and it is one reason blood tests before each re-insertion matter.

What are the risks of pellet therapy?

• Levels above the normal range. Because the dose is difficult to change after insertion, blood levels can run high, particularly for testosterone. High testosterone can cause acne, unwanted hair growth and scalp hair thinning, and changes such as a deeper voice or clitoral enlargement that may not fully reverse.
• The usual hormone therapy cautions still apply. Estrogen therapy is not suitable for everyone, including many women with a history of breast cancer, a current or past blood clot, stroke or heart attack, or unexplained vaginal bleeding. A pellet does not change those cautions.
• Risk to the uterine lining if estrogen is used without a progestogen and you have a uterus.
• Procedure complications: bruising, bleeding, infection and pellet extrusion.
• Cost. Ask for the full yearly cost, including repeat insertions, blood tests and any progesterone, and ask what insurance will cover.

What do medical societies recommend?

• ACOG (2023 clinical consensus) recommends FDA-approved hormone therapy over compounded preparations when an approved option is available and, for testosterone, recommends other preparations over pellets because pellets lack adequate safety data and are not designed to be removed.
• The Menopause Society says custom-compounded hormones are not proven safer or more effective than approved products, are not tested for how predictably they are absorbed, and may contain too much or too little hormone.
• The Endocrine Society reports no comprehensive efficacy or outcome trials for compounded hormone therapy.
• The 2019 Global Consensus on testosterone for women does not recommend pellets or injections.

How do pellets compare with FDA-approved options?

• Adjusting the dose: patches, gels, sprays and pills can be changed or stopped without another procedure; pellets are not designed to be removed.
• Approval and quality control: no estradiol or testosterone pellet is FDA-approved for women. Compounded pellets do not undergo FDA review before dispensing; Testopel is FDA-approved for specific male indications.
• Evidence: the large trials used approved oral and transdermal estrogen.
• Convenience: pellets need no daily step, which is their main appeal; a patch changed once or twice a week comes close.
• Cost and coverage: ask for the yearly total for each option and what your insurance will cover.

For a side-by-side look at an adjustable alternative, see pellets vs patches. For compounded hormones more broadly, see compounded vs pellet HRT, and for every form of hormone therapy in one place, HRT types compared.

Who might still consider pellets?

Some women choose pellets after other forms have not suited them: skin reactions to patches, difficulty with a daily gel, or trouble remembering pills. If that is you, discuss establishing how you respond to estradiol on an adjustable, FDA-approved form first, and choose a clinician who treats menopause broadly rather than one who offers only pellets. Pellets are not a recommended way to take testosterone.

What should you ask before agreeing to pellets?

• Which hormones and what dose will be in the pellets, and which pharmacy makes them?
• Have I tried an FDA-approved option, and why is a pellet better for me?
• If I have a uterus, how will my uterine lining be protected?
• What blood levels do you aim for, and will you check them before every re-insertion?
• What happens if the dose is too high or I have side effects?
• What is the total cost per year, including tests and any progesterone?

What about BioTE and other pellet networks?

Many pellet clinics belong to branded networks, such as BioTE, that train clinicians in their own dosing protocols. A network certification is a company training program, not a medical board certification, and it says nothing about a clinician's wider menopause expertise, so ask about that directly.

This article is for educational purposes only and is not medical advice. Hormone therapy decisions should be made with a qualified clinician who can review your health history, risk factors and symptoms. It reflects current clinical guidance, but medicine evolves, so check the most current recommendations with your clinician.