Does TRT Lower Sperm Count? Exploring the Effects on Male Fertility

Testosterone Replacement Therapy (TRT) can help men with low testosterone levels by increasing energy, mood, and even a low libido. However, there’s one issue many don’t expect: its impact on sperm count. If you are thinking about TRT and you want to start or grow your family, this article is for you.

Key Takeaways

• Testosterone therapy can reduce sperm count because it disrupts the hormone signals that control natural testosterone production.
• When you take external testosterone, it can lower sperm production.
• There are alternatives to testosterone therapy, such as enclomiphene, that can help increase testosterone without the same fertility risks.

Consulting a medical professional early on is important if you want children.

What Is Testosterone Replacement Therapy (TRT)?

TRT, or testosterone replacement therapy, is a hormone treatment. Doctors often use it to treat men with low testosterone levels, a condition known as male hypogonadism. Testosterone can be taken in different forms. These include:

• Oral testosterone
• Testosterone injections such as testosterone cypionate, enanthate, and the long-acting undecanoate
• Topical testosterone, such as gel and testosterone cream
• Patches
• Implants such as testosterone pellets.

TRT can help restore energy, mood, sexual function, and more. Some men investigate TRT when they feel tired all the time. They may also have a low sex drive, trouble concentrating, or gain more body fat.

For some, testosterone replacement therapy is a medical necessity to address their hypogonadal symptoms. For others, it’s a way to maintain performance, confidence, and vitality as they age. We’ve dedicated an article to the benefits of testosterone.

That said, many people overlook one significant side effect: testosterone therapy’s impact on sperm, which can contribute to male factor infertility.

Male-Factor Infertility

Fertility issues don't just affect females. In 30 to 50% of infertility cases, there’s a male factor involved (Agarwal et al., 2021).

Causes of male fertility issues may include:

• Hormone imbalance: often tied to testosterone or follicle-stimulating hormone (FSH)
• Testosterone deficiency (low testosterone)
• Low sperm count
• Poor sperm movement or shape
• Physical blockages in the male reproductive tract
• Lifestyle choices or medications (including hormone therapy, such as TRT)

Other risk factors include advanced age, obesity, untreated medical conditions, infections, past surgeries, and exposure to environmental toxins. These factors can impact fertility by negatively affecting hormone levels, sperm production, or overall reproductive health.

What Can Help Male-Factor Infertility?

• Lab testing to check hormone levels and evaluate semen parameters to assess fertility
• Targeted treatments, such as enclomiphene or human chorionic gonadotropin (hCG)
• In vitro fertilization (IVF), Intrauterine insemination, or other assisted reproductive methods
• Lifestyle improvements to boost sperm quality.

How Testosterone and Sperm Production Work

Your brain and testicles work together to keep your natural testosterone production and spermatogenesis (sperm production) in balance.

It starts in the brain:

• The hypothalamus sends a signal called GnRH (gonadotropin-releasing hormone).
• It tells the pituitary gland to release two hormones: LH (luteinizing hormone) and FSH (follicle-stimulating hormone (FSH).
• Luteinizing hormone tells the Leydig cells in your testicles to produce testosterone.
• Follicle-stimulating hormone activates the Sertoli cells, which help make sperm. Proper FSH production is necessary for spermatogenesis.

This process involves what's known as the hypothalamic-pituitary-gonadal (HPG) axis. It controls your testosterone levels and sperm production. It operates through a negative feedback loop to regulate hormone levels.

Intra-testicular testosterone is essential for sperm production and maintaining the testicular environment. Intra-testicular (localized) testosterone is the amount of testosterone made and kept inside the testes. It's different from the testosterone found in the bloodstream. Localized testosterone facilitates spermatogenesis (the process of producing sperm). 

Even if your blood testosterone levels are high due to TRT, the intra-testicular testosterone levels may be low. This can shut down sperm production and lead to infertility. Maintaining adequate intra-testicular testosterone is essential for healthy sperm development.

What Happens to Sperm Count When Starting TRT?

Testosterone replacement therapy increases the testosterone levels in your blood. But your brain doesn’t know it’s exogenous testosterone. It sees the increase and assumes your body has enough, so it stops sending signals to make more.

Here’s what happens next:

• GnRH drops
• LH and FSH levels fall
• The testicles reduce natural testosterone and sperm production.

When sperm production is reduced, your sperm count and sperm concentration can go down quickly – sometimes even to zero. Doctors refer to this condition as azoospermia. Having an adequate sperm count is important for fertility, so azoospermia can negatively affect your ability to father children.

This side effect can start within weeks of beginning testosterone replacement therapy. It's an important reason for your healthcare provider to do a semen analysis. The longer you use it, the more your sperm production may decrease.

Studies show that even short-term use of testosterone therapy can lower sperm count. It may make men temporarily infertile. Some healthcare providers may not communicate this clearly when men begin treatment.

Will Your Sperm Count Recover?

For some men, stopping TRT allows their natural hormone system to restart. But recovery can take months or longer. In some cases, especially after long-term use, full recovery doesn’t happen.

Your age, genetics, and how long you were on testosterone replacement therapy all play a role. Some men need medical help to recover their natural sperm production.

Men should monitor their sperm count recovery with regular semen analysis. Options for recovery may include fertility medications or even assisted reproductive technologies, depending on the degree of suppression and your overall health. If natural recovery does not occur, fertility treatments are available to help achieve pregnancy.

Treatment Options to Preserve Fertility

If your testosterone is low but you still want kids, there are treatments available that don’t shut down your sperm production. These options can help naturally increase testosterone levels while preserving fertility.

Medications like clomiphene citrate and hCG help your body produce more testosterone. They can be better choices than using injectable testosterone. They also promote sperm development instead of reducing it.

Selective Estrogen Receptor Modulators (SERMs)

These medications help increase your body’s own testosterone levels without turning off sperm production. Clomiphene is one example, but there are others, too. Research into newer SERMs is ongoing, and they may provide even more effective options in the future.

Clomiphene Citrate

This oral medication helps your pituitary gland produce more LH and FSH. That boosts natural testosterone and keeps sperm production going. Many men respond well to clomiphene, which is why doctors often use it as a first-line treatment.

One alternative form of this medication is enclomiphene, which is available as a standalone therapy. Unlike regular clomiphene citrate, which has a mix of isomers, enclomiphene is a pure version. It provides more focused action. It stimulates LH and FSH to boost testosterone while minimizing unwanted side effects.

Human Chorionic Gonadotropin (hCG)

hCG acts like LH and stimulates the testicles to produce testosterone. Some providers combine it with testosterone replacement therapy to protect fertility.

Doctors sometimes use hCG to "jumpstart" sperm production in men coming off TRT who want to reverse azoospermia. It's also helpful for younger men looking to optimize hormone levels without compromising their fertility.

Lifestyle Habits That Support Hormone and Sperm Health

Here’s the good news: simple changes can make a difference. Your daily routine can help balance hormones, improve sperm quality, increase bone density, and support male reproductive health. You don’t need to be ready for medication or hormones to make a difference.

• Lift weights and move your body often. Strength training boosts testosterone levels naturally.
• Get enough sleep. Lack of sleep lowers testosterone and increases stress.
• Eat better. Include whole foods, healthy fats, and nutrients like zinc and vitamin D.
• Maintain a healthy weight. Staying at a healthy weight supports hormone balance and sperm health.
• Quit smoking and cut back on alcohol. These harm both sperm and testosterone.
• Limit exposure to plastics and chemicals, which can disrupt hormones.

Other helpful habits include managing your blood sugar and staying hydrated. Avoid tight-fitting underwear that increases testicular temperature. Also, reduce screen time before bed to protect melatonin and improve sleep quality.

These steps may not fix all cases of low testosterone. However, they can help your overall reproductive health. 

FAQ: Testosterone Replacement Therapy (TRT) and Fertility

Does TRT Reduce Sperm Count?

Yes. Testosterone replacement therapy can lower the natural hormone signals your body needs to make sperm.

Will My Sperm Count Come Back After TRT?

It might. Your body's ability to resume testosterone production depends on how long you were on TRT and your unique biology.

Are There Treatments to Raise Testosterone and Maintain Fertility?

Yes. Clomiphene, hCG, and SERMs are often used for that purpose.

Should I Bank Sperm Before Testosterone Therapy?

If you are not sure about having kids in the future, consider sperm banking. It's a good idea if you want to start testosterone replacement therapy.

Can Lifestyle Changes Really Help?

They can. Exercise, sleep, nutrition, and cutting toxins all support hormone health and can have a positive effect on testosterone levels.

Can TRT ever be Used Safely With Fertility Meds?

In some cases, yes. With close monitoring and the addition of medications like hCG, it’s possible to maintain fertility while on TRT.

Is It Safe to Stay on Testosterone Therapy Long-Term?

For men not concerned with fertility, long-term testosterone replacement therapy may be safe under supervision. But regular lab testing and medical oversight are essential.

References:

• Patel, A. S., Leong, J. Y., Ramos, L., & Ramasamy, R. (2019). Testosterone Is a Contraceptive and Should Not Be Used in Men Who Desire Fertility. The World Journal of Men's Health, 37(1), 45–54.
• Ko, E. Y., & Sabanegh, E. S. (2012). The role of medical treatment of male infertility in the ART era. Journal of Reproductive Biotechnology and Fertility, 3, 34–44.
• Hotaling, J. M., Patel, Z., Smith, R. P., Muller, C. H., & Walsh, T. J. (2014). Predictors of infertility and recovery of spermatogenesis in men with a history of testosterone use. Fertility and Sterility, 101(3), 560–565.
• Practice Committee of the American Society for Reproductive Medicine. (2020). Optimizing natural fertility: a committee opinion. Fertility and Sterility, 114(6), 1156–1163.