The Fertility Question Every TRT Patient Should Ask
Testosterone replacement therapy is highly effective at restoring testosterone levels, relieving symptoms of hypogonadism, and improving quality of life for men with low T. But it comes with one significant consideration that every man of reproductive age must understand before starting: TRT suppresses the body’s natural testosterone production — and with it, sperm production.
This is not a rare or uncertain side effect. It is a predictable, well-documented pharmacological consequence of exogenous testosterone administration. Understanding why it happens, how significant the impact is, and what options exist to preserve fertility is essential for any man who currently wants children, might want children in the future, or simply wants to make a fully informed decision.
Why TRT Suppresses Sperm Production
The testes perform two functions: producing testosterone (in Leydig cells) and producing sperm (in Sertoli cells within the seminiferous tubules). Both processes are controlled by the hypothalamic-pituitary-gonadal (HPG) axis through LH and FSH.
When exogenous testosterone is introduced, the hypothalamus and pituitary detect the rise in circulating testosterone and reduce production of GnRH, LH, and FSH — the signals that drive both testicular testosterone production and spermatogenesis. The result is that sperm production decreases — often dramatically — within weeks to months of starting TRT. Studies show that approximately 90% of men on TRT have markedly reduced sperm counts (oligospermia) within 6 months; many have azospermia (no measurable sperm) on standard semen analysis.
Is the Effect Permanent?
For most men, the effect is reversible. After discontinuing TRT, the HPG axis typically recovers over 6–18 months, with semen parameters returning to pre-treatment levels in the majority of patients. However, recovery is not guaranteed — some men, particularly those who have been on TRT for many years or who had borderline semen analysis before starting, may not recover fertility fully.
This is why proactive fertility planning before starting TRT is far preferable to addressing fertility concerns after suppression has occurred.
Options for Men Who Want to Preserve Fertility
Sperm banking before starting TRT: The simplest, most reliable option. Cryopreserved sperm can be stored indefinitely and used for intrauterine insemination (IUI) or in vitro fertilization (IVF) when ready to start a family. Given the relatively low cost of sperm banking, this option is worth serious consideration for any man under 45 who is not certain his family is complete.
Clomiphene citrate (Clomid) instead of TRT: Clomiphene is a selective estrogen receptor modulator (SERM) that blocks estrogen feedback at the hypothalamus, increasing GnRH and therefore LH and FSH production. Higher LH stimulates the testes to produce more endogenous testosterone — and higher FSH maintains spermatogenesis. In men with secondary hypogonadism (where the pituitary signal is the primary deficiency), clomiphene can raise testosterone to adequate levels while maintaining or improving fertility. It is less effective in men with primary testicular failure.
HCG alongside TRT: Human chorionic gonadotropin (HCG) mimics LH action on the testes. Co-administration of HCG with TRT stimulates continued testicular testosterone and sperm production, partially preserving spermatogenesis despite the suppressive effect of exogenous testosterone. This is the most commonly used approach for men on TRT who develop fertility concerns and do not wish to discontinue therapy.
Having the Fertility Conversation at Multigen Wellness
At Multigen Wellness, fertility goals are routinely discussed during TRT consultation for men under 50 — before any prescription is written. Our providers will help you understand all options, including timing of sperm banking, alternative protocols if fertility preservation is the priority, and monitoring if HCG co-therapy is used.
Do not start testosterone therapy without understanding its fertility implications. Call Multigen Wellness at (800) 259-0015 to have an informed, unhurried consultation that covers everything you need to know.