Does Testosterone Make You Infertile? Evidence

Short answer: Does testosterone make you infertile? It can stop sperm production while you take it, and for many men that is the effect that matters. Testosterone from outside the body switches off the brain signals that drive the testes, and the drug labels warn that this can lead to azoospermia, meaning no sperm in the semen. In contraception trials sperm usually came back after stopping, but not on a fixed timetable. If you want children soon, raise it with a clinician before you start, not after.

Independently researched. Last reviewed October 26, 2026. Educational information only, not medical advice. Affiliate disclosure.

The question "does testosterone make you infertile" usually comes from one of two men: one who is about to start TRT and wants a family later, and one who is already on it and is now trying. This guide answers both with what the drug labels and the clinical studies actually measured, then explains where HCG and enclomiphene come in, and which clinics we review list them. It does not give doses for any of these drugs. Those are decided by the prescriber.

How does testosterone therapy affect sperm production?

Through feedback to the brain. The Depo-Testosterone label explains that during treatment with outside androgens, the body's own testosterone release is inhibited through feedback on pituitary luteinizing hormone. The same label adds that at large doses spermatogenesis may also be suppressed through feedback on follicle stimulating hormone.

Sperm are made inside the testes, and that work depends on a high local level of testosterone produced there under those pituitary signals. Testosterone in the bloodstream from an injection or a gel does not replace that local supply. So a blood test can look normal while sperm production falls.

The AndroGel 1.62% label states the risk in one line: outside administration of androgens may lead to azoospermia. The form does not change the principle. Injections, gels and creams all deliver testosterone from outside.

Does testosterone make you infertile permanently?

The best data come from an unexpected place: trials that used testosterone as a male contraceptive. They are useful precisely because their goal was to stop sperm, and they measured it month by month.

In a World Health Organization study published in 1990, researchers in seven countries gave weekly testosterone injections to 271 healthy fertile men. Of those, 157 men became azoospermic, a cumulative rate of 65% at 6 months. After the injections stopped, the estimated median time from azoospermia to recovery, defined as a sperm concentration of at least 20 million per ml, was 3.7 months.

A larger integrated analysis by Liu and colleagues pooled data from individual participants in 30 studies, covering 1549 healthy men. The probability of recovery to 20 million per mL was 67% within 6 months, 90% within 12 months and 100% within 24 months.

The same analysis found that recovery was faster with older age, shorter treatment duration and shorter-acting preparations, among other factors. That matters, because men on TRT are often treated for years, not for the length of a contraception trial.

So does testosterone make you infertile for good? In these trials, sperm came back for nearly everyone. Two cautions apply before reading that as a promise. The volunteers were healthy men with normal fertility to begin with, while men on TRT have low testosterone for a reason that may affect fertility on its own. And the trials were time-limited, so they say little about recovery after many years of treatment.

What do the guidelines say if you want children soon?

The Endocrine Society's clinical practice guideline recommends against starting testosterone therapy in men who are planning fertility in the near term. That is one of its listed reasons not to start, alongside conditions such as some cancers and an elevated hematocrit.

That recommendation is the reason the question "does testosterone make you infertile" belongs before the first prescription. A clinic intake form that does not ask about plans for children is missing a question the guideline treats as decisive. If you are unsure, say so. "Maybe in two years" is useful information for the clinician.

Where does HCG fit with TRT?

If the honest answer to "does testosterone make you infertile" worries you, two strategies come up most often: HCG and enclomiphene. HCG, human chorionic gonadotropin, acts like luteinizing hormone on the testes. The idea of TRT with HCG is to keep the testes producing their own testosterone, and sperm, while the brain's signal is switched off by the outside testosterone.

The evidence for the combination is thin. The study most often cited is a retrospective review by Hsieh and colleagues, which looked back at the records of men already treated, rather than a randomized trial. It covered 26 men with a mean age of 35.9 years. In that group, no patient became azoospermic during combined testosterone and HCG treatment, and nine of the 26 men contributed to a pregnancy during follow-up.

That is encouraging, and it is also a small look-back study with no comparison group. It cannot tell you how likely the combination is to protect your fertility.

On regulation, the Pregnyl label lists selected cases of hypogonadotropic hypogonadism in males among its approved uses. Giving HCG alongside testosterone therapy to preserve fertility is not among the indications on that label, so it is a prescriber's off-label decision.

HCG vs enclomiphene: what is the difference?

They answer the same problem in different ways. HCG is added on top of testosterone and stimulates the testes directly. Enclomiphene is usually used instead of testosterone: it is a pill that blocks estrogen's feedback in the brain, so the pituitary keeps sending its signals and the body makes more of its own testosterone.

The enclomiphene trials measured sperm directly against testosterone gel. In two phase III studies reported by Kim and colleagues, men with secondary hypogonadism took enclomiphene or a testosterone gel, with hormones measured after 16 weeks of treatment. Enclomiphene maintained sperm concentration in the normal range, while the testosterone gel group had a marked reduction. An earlier phase II trial by Wiehle and colleagues likewise reported that sperm counts were conserved on enclomiphene.

Neither is a fit for every man. Enclomiphene depends on the testes being able to respond, so it is generally discussed for secondary hypogonadism, where the problem lies in the brain's signal rather than in the testes. Which option, if any, suits you is a decision for the clinician who has your lab results. Our separate guide on enclomiphene vs TRT covers that choice in detail, and the enclomiphene hub lists the clinics and prices we record.

Clomiphene, the older drug sold as Clomid, works the same way as enclomiphene. Its label says there are no adequate or well-controlled studies showing it works for male infertility. We cover its cost separately in Clomid cost for men.

Which online clinics offer HCG or enclomiphene?

These clinics we review list HCG among their treatments, partner clinics first. A partner's box shows its HCG price as published on the clinic's own page, with the date we checked it; the other clinics' HCG prices are in their reviews. A vial price is not a monthly price, and how long a vial lasts depends on the prescription.

Peter MD sells HCG alongside its TRT plans. Its HCG product page, read October 26, 2026, describes it as a "Weekly Injection taken with TRT to prevent testicular atrophy and infertility" and lists the states where it is not sold. That is the clinic's own claim, and the evidence above is more modest. See the Peter MD review.

DudeMeds lists brand HCG (Pregnyl) on its injectable TRT price selector, per our record of October 22, 2026. See the DudeMeds review.

Defy Medical lists HCG among its treatments, and its TRT page, read October 26, 2026 (defymedical.com), describes supplemental medications that "can help with testicular health, fertility". See the Defy Medical review.

AlphaMD lists HCG on its own shop page. See the AlphaMD review.

For enclomiphene, the enclomiphene hub shows every clinic we review that offers it, including Hone Health, Maximus and DudeMeds, with the enclomiphene price where the clinic publishes one.

What should you ask a clinic before starting TRT?

If your answer to "does testosterone make you infertile" is still uncertain after reading this, put it to the clinic. These questions are about the service, not about choosing a drug yourself:

• Does the intake ask whether I plan to have children, and when?
• Will you offer a semen analysis before I start if fertility matters to me?
• If I want to keep fertility, which options do you prescribe, and on what evidence?
• Is HCG or enclomiphene billed separately from the TRT plan, and at what price?
• What happens to my plan if I stop testosterone to try for a child?

A clinic that answers these in writing is easier to compare than one that answers on a sales call. Our guide to choosing an online TRT clinic has the wider checklist, and TRT side effects covers the other risks on the label.

Frequently asked questions about testosterone and fertility

Does testosterone make you infertile right away?

Not overnight. In the WHO contraception study, most men who reached azoospermia did so over several months of weekly injections. Sperm counts fall gradually, so a man on TRT can still father a child early on. That is not a reason to rely on it either way.

Does testosterone make you infertile if you only take a low dose?

The labels describe suppression as a property of testosterone given from outside the body, and gels as well as injections carry the warning. We cannot tell you that any particular amount is safe for fertility. Ask the prescriber and consider a semen analysis.

Can sperm come back after stopping TRT?

In the contraception trials, almost all men recovered, most within a year. Those were healthy volunteers on time-limited treatment, so recovery after years of TRT, or in men with an underlying testicular problem, can be slower and is less certain.

Is TRT with HCG proven to keep fertility?

No. The main study is a small retrospective review in which no man became azoospermic and some fathered children. It had no comparison group, so it shows that the combination can work, not how often.

HCG vs enclomiphene: which is better for fertility?

They suit different men. Enclomiphene has randomized trial data showing sperm counts were kept, but it only helps if the testes can respond. HCG is used alongside testosterone when testosterone itself is needed. A clinician with your results should make that call.

Related reading and clinic reviews

• Enclomiphene clinics and prices
• Enclomiphene vs TRT
• Peter MD review and DudeMeds review
• Defy Medical review
• TRT side effects

Medical disclaimer: Educational information only, not medical advice. Whether and how to protect fertility on testosterone therapy is a decision for a licensed clinician who knows your history and results. This page does not give doses for testosterone, HCG, enclomiphene or clomiphene. Some links lead to partner clinics; see our affiliate disclosure. Labels, studies and clinic pages read October 26, 2026.