Does TRT Affect Fertility? Sperm, Recovery and Options

Does TRT affect fertility? Yes. Testosterone from outside the body tells the brain to turn down the hormones that drive sperm production, and testosterone inside the testes falls with them. Sperm counts can drop, sometimes to zero. For many men, sperm production returns after stopping, but recovery varies widely and is not certain. If you want children now or later, raise it before starting testosterone.

Key takeaways

• Testosterone therapy suppresses LH and FSH, the pituitary signals that drive sperm production, so a good blood testosterone number does not reflect sperm production.
• In contraception studies of healthy men, sperm usually returned after stopping, but recovery is highly variable and some infertile men may never recover.
• Major guidelines advise against testosterone for men trying to conceive, and the AUA/ASRM guideline extends that to men who want children later.
• If fertility matters to you, a testicular exam, an FSH test and often a semen analysis belong before starting testosterone.
• Adding hCG to testosterone, or using enclomiphene instead, are options a clinician may consider, but both rest on small studies.

Why does TRT affect fertility?

TRT affects fertility because outside testosterone switches off the signals that tell the testes to make sperm. Blood testosterone rises while testosterone inside the testes falls.

Sperm production runs on a chain of signals called the HPG (hypothalamic-pituitary-gonadal) axis. The hypothalamus, a control area in the brain, prompts the pituitary gland to release LH (luteinizing hormone), which tells Leydig cells in the testes to make testosterone, and FSH (follicle-stimulating hormone), which supports the cells that make sperm.

Sperm production also depends on a high level of testosterone inside the testes, called intratesticular testosterone. When testosterone arrives from an injection, cream or capsule, the brain reads the supply as sufficient and turns LH and FSH down. The testes stop making their own testosterone, intratesticular testosterone drops sharply, and sperm production is impaired (Nature Reviews Urology, 2025; World J Men's Health, 2019).

Estimates of how often this happens vary by group. A 2013 study's background section cites azoospermia, meaning no sperm in the ejaculate, in 40% of men on TRT (J Urol, 2013). A 2020 review reports that in a World Health Organization contraception study of healthy men, injectable testosterone enanthate caused azoospermia in about 75% after six months (World J Men's Health, 2020). Neither figure predicts any one man's result.

Is TRT infertility reversible? What the recovery data shows

Often, but not on a schedule anyone can promise. In contraception studies of healthy men, sperm usually returned after stopping, yet the American Urological Association (AUA) guideline stresses that recovery is highly variable and that some infertile men may never recover (AUA, 2018).

A 2013 review summarizes an analysis by Liu and colleagues of 30 hormonal contraception studies in healthy men aged 18 to 51, tracking how long sperm concentration took to return to 20 million per milliliter, a common benchmark (Transl Androl Urol, 2013):

• Median time: 3.4 months
• Probability of recovery within 6 months: 67%
• Within 12 months: 90%
• Within 16 months: 96%
• Within 24 months: 100% of men in these healthy-volunteer studies
• The AUA guideline summarizes contraceptive studies in similar terms: about two-thirds of men had sperm back within six months, and 10% did not until the second year (AUA, 2018).

Faster recovery was linked to older age, shorter treatment, shorter-acting testosterone preparations and lower LH before treatment (Transl Androl Urol, 2013).

The limits matter. The men were healthy volunteers rather than men with testosterone deficiency, and reaching a sperm-count benchmark is not the same as conceiving.

What do the guidelines say about TRT and fertility?

The major guidelines agree that testosterone should not be prescribed to men trying to conceive. They differ on how far ahead that caution reaches.

Two points the table leaves out. The AUA guideline says men on testosterone who plan to conceive should stop it before trying (AUA, 2018). For infertile men with low testosterone, the AUA/ASRM guideline, written with the American Society for Reproductive Medicine, allows hCG, SERMs (selective estrogen receptor modulators, which block estrogen's braking signal on the brain so LH and FSH rise), aromatase inhibitors (which reduce conversion of testosterone to estrogen) or a combination (AUA/ASRM, 2024).

Should you get a semen analysis before TRT?

If you might want children, ask about one. The AUA recommends a testicular exam and an FSH blood test for men with testosterone deficiency who want to preserve fertility, and says that when FSH is elevated, clinicians should consider additional testing such as a semen analysis (AUA, 2018).

1. Testicular exam. A clinician checks size, consistency and whether both testes have descended.
2. FSH blood test. A raised FSH alongside low testosterone typically signals that sperm production is already impaired.
3. Semen analysis. A lab test of sperm count, movement and shape. One review advises that every man who wants to preserve fertility on testosterone get a baseline analysis and set out his timeline for pregnancy (World J Men's Health, 2020).
4. Confirmed low testosterone. Our guide to low testosterone symptoms, testing and treatment covers how the diagnosis is made.

Some men also bank sperm, freezing semen before starting therapy, which is worth raising with a clinician or fertility specialist.

hCG with TRT for fertility: what it does and what the evidence shows

hCG acts like LH on the testes, so it can keep them making testosterone during TRT. The evidence that this protects fertility comes mainly from one small study.

hCG (human chorionic gonadotropin) is an LH analog that directly stimulates Leydig cells to make testosterone (Transl Androl Urol, 2025). Given with testosterone, it can maintain intratesticular testosterone (AUA, 2018).

The key study reviewed the records of 26 men with low testosterone treated with TRT plus hCG. No man became azoospermic during combined therapy, and 9 of the 26 contributed to a pregnancy during follow-up. The authors concluded hCG appears to maintain semen parameters and may preserve fertility in men on TRT (J Urol, 2013).

Its limits are real. It was a small retrospective review of 26 men, meaning researchers looked back at existing records. Mean follow-up was about six months, and reviewers said more study was needed before concluding the combination preserves fertility (Transl Androl Urol, 2013). A 2025 review notes that the AUA infertility guidelines judge the evidence insufficient to support adding hCG for men who want future fertility, and that sperm production is not maintained long term by hCG without FSH support (Transl Androl Urol, 2025).

hCG may support testicular function and fertility during testosterone therapy, but it may not preserve fertility. Any use follows your clinician's guidance and pharmacy instructions.

Enclomiphene vs TRT for fertility

Enclomiphene takes a different route: instead of adding testosterone, it prompts the pituitary to release more LH and FSH, so the body makes more of its own.

In a small study of men with secondary hypogonadism (low testosterone caused by weak signals from the brain rather than a testicular problem), testosterone applied to the skin raised testosterone but suppressed LH and FSH, with LH significantly suppressed after as little as two weeks. Men taking enclomiphene had increases in LH, FSH and testosterone, which the authors said explain the positive effects on sperm counts seen with enclomiphene (BJU Int, 2013). This is early-phase hormone research, not a trial measuring pregnancies, and a 2025 review lists enclomiphene as still under active investigation (Transl Androl Urol, 2025).

Enclomiphene is not an FDA-approved medication, and whether it fits is a clinical judgment. New Blue's enclomiphene hormone support pathway uses enclomiphene compounded at a state-licensed 503A pharmacy, and compounded medications are not FDA-approved (see the compounding disclosure). For a fuller side-by-side, read enclomiphene vs testosterone replacement.

Which option fits your situation?

Your timeline for children shapes the conversation more than anything else.

1. Not started TRT yet. Get the fertility evaluation first. One review advises that men who want a pregnancy within about six months and have not started testosterone hold off until pregnancy is achieved (World J Men's Health, 2020).
2. On TRT and want to keep the option open. Tell your clinician now and ask whether a semen analysis, adding hCG or a different approach fits your labs. Make any change with your clinician, not on your own.
3. Trying to conceive now. Guidelines advise against testosterone here, so plan any stop with a clinician. Specialists may use hCG, FSH, SERMs or aromatase inhibitors to help restore sperm production in select men (Nature Reviews Urology, 2025). Both partners should be evaluated, often with a reproductive urologist or fertility specialist (AUA/ASRM, 2024).

How access works through New Blue

Hormone care through New Blue is synchronous: it includes a live clinician visit plus lab work. A licensed clinician decides whether any treatment is appropriate.

1. Intake. You share symptoms, history, your timeline for children and any past testosterone or anabolic steroid use.
2. Live visit and labs. An independent licensed clinician reviews your history and lab work. Consultation timing varies by clinician availability.
3. Clinical decision. Based on your intake and clinical review, the clinician decides whether an option such as Testosterone + hCG support or enclomiphene is appropriate. Not everyone qualifies. Eligibility depends on your intake and clinical review, and that's how it should work.
4. Fulfillment. If prescribed, the pharmacy ships directly to you.

Testosterone + hCG support ships to every state New Blue serves except California; see state availability and delivery limits. For current pricing, visit the Testosterone + hCG support page. If treatment isn't appropriate, refunds follow our refund policy.

New Blue is a technology and administrative services platform. Medical services are provided by independent licensed clinicians; medications are dispensed only when prescribed. New Blue is available in 48 states, serves adults 21 and older, and is not for emergencies.

Frequently Asked Questions

Does testosterone replacement therapy lower sperm count?

Yes. Testosterone from outside the body suppresses LH and FSH and lowers testosterone inside the testes, so sperm counts can fall sharply, sometimes to zero. A normal blood testosterone level on TRT does not mean normal sperm production.

Is TRT infertility reversible?

Often, but not predictably. In contraception studies of healthy men, about two-thirds had sperm back within six months of stopping. The AUA guideline notes recovery is highly variable and some infertile men may never recover, so the risk belongs in the conversation before starting.

What is hCG and why is it used with TRT?

hCG (human chorionic gonadotropin) acts like LH on the testes, helping them keep making testosterone during TRT. In one retrospective study of 26 men on TRT plus hCG, none developed azoospermia. A 2025 review notes the AUA infertility guidelines consider the evidence insufficient.

Is enclomiphene an alternative to TRT for fertility?

For some men, it may be. Enclomiphene raises the body's own LH, FSH and testosterone instead of replacing testosterone. The evidence comes from small hormone studies, enclomiphene is not an FDA-approved medication, and whether it fits is a clinical decision.

What should I do if I'm on TRT and want to conceive now?

Talk to your clinician before changing anything. The AUA advises stopping testosterone before trying to conceive, a plan best made with a clinician. A reproductive urologist or fertility specialist can help, and both partners should be evaluated.

Sources

1. Evaluation and Management of Testosterone Deficiency: AUA Guideline. Journal of Urology, 2018. https://doi.org/10.1016/j.juro.2018.03.115
2. Diagnosis and Treatment of Infertility in Men: AUA/ASRM Guideline (2020; amended 2024). American Urological Association / American Society for Reproductive Medicine, 2024. https://www.auanet.org/guidelines-and-quality/guidelines/male-infertility
3. Testosterone Therapy in Men With Hypogonadism: An Endocrine Society Clinical Practice Guideline. The Journal of Clinical Endocrinology and Metabolism, 2018. https://pubmed.ncbi.nlm.nih.gov/29562364/
4. Concomitant intramuscular human chorionic gonadotropin preserves spermatogenesis in men undergoing testosterone replacement therapy. The Journal of Urology, 2013. https://pubmed.ncbi.nlm.nih.gov/23260550/
5. Exogenous testosterone: a preventable cause of male infertility (Crosnoe et al.). Translational Andrology and Urology, 2013. https://tau.amegroups.org/article/view/2249/html
6. Testosterone replacement therapy and spermatogenesis in reproductive age men. Nature Reviews Urology, 2025. https://www.nature.com/articles/s41585-025-01032-8
7. Preserving spermatogenesis in testosterone deficiency: innovations in replacement and stimulatory therapies (Hochu et al.). Translational Andrology and Urology, 2025. https://tau.amegroups.org/article/view/146924/html
8. Testosterone Restoration by Enclomiphene Citrate in Men with Secondary Hypogonadism: Pharmacodynamics and Pharmacokinetics. BJU International, 2013. https://pmc.ncbi.nlm.nih.gov/articles/PMC4155868/
9. Testosterone Is a Contraceptive and Should Not Be Used in Men Who Desire Fertility. The World Journal of Men's Health, 2019. https://pmc.ncbi.nlm.nih.gov/articles/PMC6305868/
10. Management of Anabolic Steroid-Induced Infertility: Novel Strategies for Fertility Maintenance and Recovery. The World Journal of Men's Health, 2020. https://doi.org/10.5534/wjmh.190002

Medical disclaimer: This article is for educational purposes only and is not medical advice. Decisions about testosterone, hCG, enclomiphene or any other treatment are made by a licensed clinician based on your history, examination and lab results. New Blue Health is a technology and administrative services platform, not a medical provider.