Summary of Testosterone Implant Therapy in Women
This article, written by Rebecca Glaser and Constantine Dimitrakakis, explores the use of testosterone (T) implant therapy in women, including those with and without breast cancer. It explains why testosterone is important for women’s health, how it works in the body, and the evidence supporting its safety and effectiveness. Below is a detailed summary in simple, everyday language to help you understand the key points.
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What is Testosterone, and Why is it Important for Women?
Testosterone is often thought of as a “male hormone,” but it’s actually the most abundant active hormone in women’s bodies. It plays a critical role in keeping women healthy by supporting:
- Physical health: Strong muscles, bones, and energy levels.
- Mental health: Mood, confidence, and clear thinking.
- Sexual health: Libido (sex drive) and sexual satisfaction.
- Overall well-being: Immune system function, heart health, and prevention of diseases like osteoporosis or heart disease.
Testosterone works directly in the body’s organs through androgen receptors, which are like docking stations that testosterone plugs into to do its job. It also gets converted into estrogen (estradiol) in many tissues, which is another important hormone for women.
As women age, their testosterone levels naturally decline, starting as early as their late 20s. This drop can lead to symptoms like:
- Fatigue and low energy.
- Mood swings, anxiety, or depression.
- Low sex drive.
- Weak bones or muscles.
- Trouble sleeping, memory problems, or joint pain.
These symptoms can happen even before menopause and aren’t always related to low estrogen. The authors argue that replacing testosterone through therapy can help relieve these symptoms and improve quality of life.
How Does Testosterone Work in Women’s Bodies?
The article explains that most of the testosterone in women doesn’t come from the ovaries or adrenal glands directly. Instead, about 80% of it is made inside the body’s tissues from “pre-hormones” like DHEA (dehydroepiandrosterone) and androstenedione. These pre-hormones are produced by the adrenal glands and then converted into testosterone in places like the muscles, bones, brain, and skin.
Because so much testosterone is made locally in tissues, blood tests for testosterone levels don’t tell the whole story. The testosterone measured in your blood is only a small part (less than 20%) of the total testosterone your body is using. This means doctors can’t rely on blood tests alone to decide if a woman has low testosterone or how much testosterone therapy she needs. Instead, they should focus on symptoms and how the patient feels.
Testosterone can also turn into estrogen through a process called aromatization, which happens in tissues like fat, the brain, and breasts. This is important because too much estrogen (relative to testosterone) can cause problems, like increasing the risk of breast or uterine issues. The authors suggest that combining testosterone therapy with an aromatase inhibitor (a drug that blocks the conversion of testosterone to estrogen) can help avoid these risks, especially in women with breast cancer.
What is Testosterone Implant Therapy?
Testosterone implant therapy involves inserting small pellets under the skin (usually in the hip or buttock) that slowly release testosterone into the body over several months. This method provides a steady, continuous dose of testosterone, unlike creams or patches, which can cause ups and downs in hormone levels.
The therapy has been used safely in women since the 1930s, with doses ranging from 50 to 400 mg for general health and even higher (500–1800 mg) for breast cancer treatment. The authors have treated over 2,500 women with these implants since 2005, including more than 230 breast cancer patients. In 2020 alone, they performed 3,331 pellet insertions in 1,022 women.
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Benefits of Testosterone Implant Therapy
The authors provide evidence from their own studies and decades of clinical experience showing that testosterone implants can help women in many ways:
- Relieves Symptoms of Hormone Deficiency:
- Using a questionnaire called the Menopause Rating Scale (MRS), the authors found that testosterone implants significantly improved 11 common symptoms in both pre- and postmenopausal women, including:
- Hot flashes and sweating.
- Heart discomfort (like racing heart).
- Sleep problems.
- Depression, irritability, or anxiety.
- Fatigue and memory issues.
- Low sex drive.
- Bladder or vaginal problems.
- Joint and muscle pain.
- Both younger (premenopausal) and older (postmenopausal) women saw similar improvements, and higher doses led to better results.
- Using a questionnaire called the Menopause Rating Scale (MRS), the authors found that testosterone implants significantly improved 11 common symptoms in both pre- and postmenopausal women, including:
- Improves Quality of Life:
- Women reported feeling better overall, with more energy, better mood, and improved sexual health.
- Specific examples include relief from migraines, better memory, and even reduced tremors in some patients (e.g., one woman could sign her name and drink from a bottle without spilling after starting therapy).
- Safe for Breastfeeding:
- In one case, a 100-mg testosterone pellet helped a breastfeeding mother with depression, anxiety, and fatigue without increasing testosterone levels in her breast milk or her baby’s blood.
- Neuroprotective Effects:
- Testosterone may protect the brain, helping with memory and possibly reducing symptoms of conditions like epilepsy or migraines.
- Helps with Estrogen-Related Conditions:
- In premenopausal women, testosterone therapy improved conditions like heavy periods, endometriosis, uterine fibroids, and breast pain, which are often linked to too much estrogen.
Testosterone and Breast Cancer: A Surprising Benefit
One of the most exciting findings in this article is that testosterone therapy may not only be safe for women with breast cancer but could also lower the risk of developing or recurring breast cancer. Here’s what the authors found:
- Lower Breast Cancer Risk:
- In a 10-year study of 1,267 women on testosterone implants, only 11 developed invasive breast cancer, compared to an expected 18 cases based on general population rates. This suggests testosterone therapy reduced the risk of breast cancer.
- Women who stopped testosterone therapy had a higher chance of developing breast cancer later, hinting that testosterone might slow the growth of undetected cancers.
- Helps Breast Cancer Survivors:
- The authors used testosterone implants combined with an aromatase inhibitor (T+AI) in breast cancer survivors. This combo delivers testosterone’s benefits while preventing it from turning into estrogen, which could fuel hormone-sensitive cancers.
- In a study presented at the American Society of Clinical Oncology, breast cancer survivors (stages 0–4) saw significant relief from symptoms like hot flashes, fatigue, and mood swings when treated with T+AI implants.
- Some patients even saw their tumors shrink or disappear completely. For example, a 58-year-old woman with a large breast tumor saw it vanish after 26 weeks of T+AI therapy, and she remained cancer-free two years later.
- Improves Quality of Life in Metastatic Cancer:
- Women with advanced (metastatic) breast cancer reported dramatic improvements in quality of life, including less pain, better energy, and the ability to walk without assistance, when treated with T+AI implants.
- In one case, a 67-year-old woman with lung metastases and an 8-cm breast tumor saw her tumors shrink significantly after a year of T+AI therapy, along with a healthier diet.
- May Ease Chemotherapy Side Effects:
- Testosterone might reduce some side effects of chemotherapy, like nerve or heart damage, based on early lab studies and clinical observations.
Safety and Side Effects
The authors emphasize that testosterone implant therapy is safe when done properly, with decades of evidence to back it up. However, there are some things to watch for:
- Side Effects:
- Some women experience facial hair growth, acne, or mild clitoral enlargement. These can often be managed by lowering the dose or treating the symptoms directly.
- Testosterone can increase red blood cell production, which might raise the risk of blood clots in rare cases. The authors monitor blood counts and found that only a few women had high levels, with no serious complications like heart attacks or strokes in their practice.
- Pregnancy Concerns:
- Testosterone is labeled as a “class X” teratogen, meaning it could harm a fetus. Women are advised to use birth control while on therapy. However, the authors note that the low daily doses from implants (1–3 mg) are unlikely to cause harm, and they’ve seen healthy pregnancies in women on therapy (though contraception is still recommended).
- No Voice Changes:
- A study showed that testosterone implants don’t deepen or harm women’s voices, even at higher doses. In fact, some women with hoarse voices saw improvement, possibly due to testosterone’s anti-inflammatory effects.
- Hair Growth:
- Contrary to myths, testosterone therapy helped 63% of women with age-related hair loss regrow hair. Low testosterone levels were linked to hair thinning, and therapy often improved it.
- No Increased Cancer or Heart Risks:
- Long-term studies, including those on transgender men using high testosterone doses, show no increased risk of cancer, heart disease, or stroke. Testosterone may even improve insulin sensitivity, which helps with blood sugar control.
How is Testosterone Dosing Decided?
The article explains that testosterone dosing isn’t about hitting a specific number in a blood test. Since blood tests don’t capture the full picture of testosterone in the body, doctors should base dosing on:
- Symptoms: Are the patient’s symptoms improving (e.g., less fatigue, better mood)?
- Side Effects: Are there any unwanted effects, like too much facial hair?
- Individual Needs: Some women need higher doses for conditions like breast cancer or severe symptoms.
The authors use “pharmacological dosing,” which means giving enough testosterone to get a strong effect, even if blood levels are higher than what’s considered “normal” for women. Their studies show that these higher levels (e.g., 300–500 ng/dL) are safe and effective. For example:
- Doses typically range from 60 to 380 mg per implant, inserted every 2–6 months.
- Blood levels peak shortly after insertion and gradually decline, but even at their lowest (when symptoms return), they’re often higher than natural levels.
Controversies and Misconceptions
There’s been debate about testosterone therapy in women, and the authors address some common issues:
- Misguided Guidelines:
- Some medical guidelines say testosterone should only be used for low sex drive and that blood levels should stay in the “normal” range. The authors disagree, arguing that these guidelines ignore the bigger picture of testosterone’s benefits and rely too heavily on drug company-funded studies.
- Blood Tests Aren’t Reliable:
- Guidelines that emphasize blood tests for diagnosing low testosterone or adjusting doses don’t make sense because most testosterone is made in tissues, not the blood. The American College of Obstetricians and Gynecologists supports this view, saying hormone therapy should focus on symptom relief, not lab numbers.
- Pellets vs. Other Forms:
- Some critics argue against testosterone pellets because they’re not regulated by the FDA and can lead to high blood levels. But the authors point out that pellets have been used safely for over 80 years and provide steady hormone release, unlike creams or patches.
- Breast Cancer Myths:
- Some studies suggest high testosterone levels are linked to breast cancer, but the authors found no evidence that testosterone therapy causes cancer. In fact, their data shows it may protect against it.
Why Combine Testosterone with an Aromatase Inhibitor?
Real-World Examples
The article includes powerful stories of women who benefited from testosterone therapy:
- A 65-year-old woman with hand tremors could barely sign her name before therapy. Two hours after a 160-mg testosterone implant, her signature improved, and she could do everyday tasks like drinking water or eating soup without spilling.
- A 38-year-old woman who hadn’t had a period in years got pregnant after testosterone therapy and delivered a healthy baby girl.
- A 58-year-old breast cancer patient with a 6-cm tumor refused standard treatment. After T+AI implants and dietary changes, her tumor disappeared, and she was cancer-free two years later.
- A 60-year-old woman with metastatic breast cancer went from being unable to walk to thriving five years later, thanks to T+AI therapy alongside conventional treatment.
Conclusion
The authors make a strong case for testosterone implant therapy as a safe and effective way to improve women’s health, whether they’re dealing with aging, hormone deficiency, or breast cancer. They argue that testosterone is essential for physical, mental, and sexual well-being and that implants offer a reliable way to deliver it. By combining testosterone with aromatase inhibitors, they’ve found a way to help breast cancer patients feel better and possibly fight their disease.
The key takeaway is that testosterone therapy should be tailored to each woman’s symptoms and needs, not based on blood tests or rigid guidelines. With over 15 years of experience and thousands of patients treated, the authors believe this therapy can transform lives and should be more widely accepted in medicine.
