Patient education ·
Does TRT Affect Fertility? What Men Should Know Before Starting Testosterone
Testosterone therapy can lower sperm production, sometimes to zero. Here is why it happens, what medical guidelines say and what to ask before starting TRT if children may be in your future.
Published by Sexual Wellness Centers of America · Patient education
Quick answer
Yes. Testosterone replacement therapy (TRT) can reduce sperm production, and in some men it stops sperm production while treatment continues. It is not a male contraceptive and should not be relied on as one, but it can make conceiving harder. For that reason, both the American Urological Association and the Endocrine Society advise against starting testosterone therapy in men who are trying to have a child. If future fertility matters to you, raise it before treatment begins, not after.
Key takeaways
- Added testosterone signals the brain to reduce the hormones that tell the testicles to make sperm.
- Higher testosterone in the blood does not mean higher testosterone inside the testicles, where sperm production needs it.
- In studies, sperm production usually returned after testosterone was stopped, but recovery took months and varied from man to man.
- Men who want children now or later should discuss fertility, testing and alternatives with a clinician before starting TRT.
Why can testosterone therapy lower sperm production?
Sperm production depends on signals from the pituitary gland. Two pituitary hormones matter most: luteinizing hormone (LH), which prompts the testicles to make their own testosterone, and follicle-stimulating hormone (FSH), which supports the cells that nurture developing sperm. A 2016 review in the Asian Journal of Andrology explains that normal sperm production needs both FSH and a very high level of testosterone inside the testicles, far higher than the level in the bloodstream.
When testosterone comes from a gel, injection or pellet, the brain detects the higher level and reduces LH and FSH. The testicles then make less of their own testosterone and less sperm. As Cleveland Clinic explains, testosterone therapy raises the level in your blood but not inside the testicles, which is why it can work against fertility even while it treats symptoms.
What do medical guidelines say?
The American Urological Association's guideline on testosterone deficiency advises clinicians not to prescribe testosterone to men who are actively trying to conceive. It also recommends discussing the effect of testosterone on sperm production with men who want children in the future, and evaluating reproductive health before treatment in men who want to preserve fertility.
The Endocrine Society's clinical practice guideline similarly recommends against testosterone therapy in men who are planning fertility in the near term.
Guidelines describe what experts recommend for groups of patients. They do not decide your individual plan, which depends on your symptoms, test results, health history and goals.
Does fertility come back after stopping TRT?
Often, but not on a predictable schedule. The 2016 review summarized data from male-contraception studies in which men received testosterone and then stopped. Sperm concentration returned to a normal threshold in an estimated 67% of men by 6 months, 90% by 12 months, 96% by 16 months and 100% by 24 months after testosterone was stopped.
The same review notes that longer use of testosterone, older age and other factors may slow recovery, and that men with several years of prior use may not recover at the same rate. Those studies also followed men in controlled research settings, which is not the same as every real-world treatment history. If you have already been using testosterone, a clinician can explain what testing would show where your fertility stands today.
Are there options for men who want children?
The AUA guideline notes that some medicines work differently from testosterone and may be used in men who want to preserve fertility. Whether any of them is appropriate depends on your diagnosis, health history and goals. This article cannot tell you which, if any, fits your situation.
What you can do is make fertility part of the first conversation. Useful things to say include:
- Whether you want children in the next year, someday or not at all.
- Whether you have used testosterone or other hormone products before, and for how long.
- Whether you and your partner have had any difficulty conceiving.
Useful questions to ask include how testosterone could affect your fertility, whether any fertility testing is recommended before treatment, what alternatives exist and how follow-up would be handled.
How the evaluation works at the Colleyville clinic
At Sexual Wellness Centers of America, hormone replacement therapy begins with your symptoms, medical history, a physical exam and blood work before an individualized plan is considered. Symptoms such as fatigue or low libido are not enough to diagnose low testosterone on their own; the clinic's low-testosterone guide explains why testing and context matter. If you are comparing the overall commitment, the article on testosterone replacement therapy cost covers what ongoing care can involve.
Sexual Wellness Centers of America is located at 6225 Colleyville Boulevard, Suite 100, Colleyville, TX 76034. Call (214) 556-1300 or use the consultation-request form, and mention that fertility is part of your decision so it can be discussed from the start.
The form requests a clinic follow-up; submitting it does not confirm an appointment or establish eligibility for treatment. Do not use a routine consultation request for urgent medical concerns.
General patient education only. This article does not diagnose low testosterone, recommend a treatment or replace advice from a clinician who knows your history.