TRT can help sex, but not conception
A very common misunderstanding is that more testosterone means more masculinity and better fertility. The opposite is true. External testosterone makes the brain stop stimulating the testes, sharply reducing sperm production, sometimes to zero, even when desire or erections improve.[1]
Many men only learn this after using testosterone for some time and struggling to conceive. Knowing beforehand matters.
Why discuss it before starting
The European Association of Urology (EAU) recommends discussing fertility before every course of TRT, because sperm counts can fall markedly or become undetectable.[1] The decision is not only about one man; it affects future family plans too.
For men unsure about children, or who may want them in several years, early planning keeps options open, such as banking sperm first.
How much do sperm counts fall?
Suppression varies with the formulation, dose and duration, and no single figure guarantees that fertility will be preserved.[3] Some men see a partial fall, others lose sperm entirely, and it cannot be predicted reliably in advance.
Why external testosterone suppresses sperm
Sperm production needs two things: FSH from the pituitary, and a very high testosterone level inside the testes, many times higher than in the blood. LH from the brain tells the testes to produce this internal testosterone.[1],[2]
When testosterone is given from outside, the brain senses that blood levels are high enough and reduces LH and FSH. Testosterone inside the testes falls sharply, sperm production slows or stops, and the testes often shrink, even though blood levels look normal or high.[1],[2]
How it is assessed
Your doctor will ask directly about your fertility goals, now and in future, about any past use of testosterone or steroids, including from gyms or online sources, and will examine the testes.[1],[2]
When indicated, a semen analysis and hormone tests such as LH and FSH show how sperm production is working and guide the right plan.[1],[3]
Options for men who want children
Get specialist advice before TRT. If you want children, see a fertility specialist before starting testosterone.[1],[2]
Bank sperm first. For men who need testosterone but may want children later, freezing sperm before treatment helps preserve the option.
Treat the specific cause. In men whose low testosterone comes from the brain or pituitary, doctors may use medicines that stimulate the body's own production, such as hCG, which keeps the testes working and producing sperm, instead of external testosterone.[1],[2]
If you already use testosterone and want children, do not simply stop without a plan. See a doctor to plan stopping and recovery. Sperm production can take months or longer to return after stopping, and full recovery is not guaranteed for everyone.[1],[3]
How we care for you at Dr. Kris Clinic
Everyone who consults us about TRT is asked about family plans. We explain clearly how testosterone affects sperm before any decision, in English or Thai, and if fertility matters we help plan alternatives or refer you to a fertility specialist.
If you have used testosterone or steroids from another source and now want children, we offer judgement-free advice and help plan a safe way to stop.
Frequently asked questions
Can I still have children while on testosterone?
It may become much harder, because testosterone suppresses sperm production, sometimes completely. Men who want children should talk to a doctor before starting.
Will my sperm return if I stop?
Usually it gradually returns, but it can take months or longer, and full recovery is not guaranteed for everyone.
Can testosterone treat infertility?
No, and it may make it worse. Infertility needs assessment and treatment of its cause.
Should I bank sperm before starting TRT?
It is worth considering if you may want children in future. Your doctor can help you decide.
TRT is not a fertility treatment and can strongly suppress sperm production.[1] Men who still want children should discuss this with a doctor before starting, to consider alternatives or sperm banking first.
Talk to a doctor about this
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Dr. Krida Uakridathikarn (Dr. Kris)
Board-certified family physician with certificate training in clinical sexology and sexual medicine. He works at Suratthani Hospital and provides sexual health, hormone and LGBTQ+ inclusive care at Dr. Kris Clinic. Profile and CV
References
- EAU Guidelines 2026: Male Hypogonadism
- Endocrine Society: Testosterone Therapy for Hypogonadism (2018)
- EAU Guidelines 2026: Male Infertility
Keep reading
Main guide: Men's sexual health
Low Testosterone: Symptoms and How It Is Properly Diagnosed
Tests Before Starting Testosterone Therapy (TRT)
Testosterone Injections or Gel: How They Differ and How to ChooseThis article is general education, not personal medical advice or a promise of results. Diagnosis and treatment require assessment by a doctor. Content reflects the cited sources as of the update date.