Dr. Bellman's TRT fertility advice is spot-on, but incomplete
Quick answer
Exogenous testosterone suppresses the HPG axis, leading to reduced intratesticular testosterone and impaired spermatogenesis in a variable but often significant proportion of men on TRT. Dr. Bellman recommends semen analysis as an initial fertility screen and suggests HCG or clomiphene for men who show azoospermia or oligospermia, both of which are evidence-supported interventions. The video does not address the need for serial monitoring in men who test normal initially, nor does it discuss recovery timelines after TRT discontinuation.
Our take · Written by FormBlends editorial team · Reviewed by FormBlends Medical Team· This is not a transcript. It is our independent review of the video above.
What did @socalurologyinstitute actually say?
Dr. Gary Bellman's advice is straightforward: if you're a young man on testosterone and thinking about having kids, start with a semen analysis. His logic runs like this: if sperm count looks fine, carry on. If it shows "zero sperm or low sperm," he recommends considering clomiphene or HCG to restore fertility. He also warns that the longer you stay on testosterone, the longer the negative impact on fertility can persist.
This is, broadly speaking, reasonable clinical guidance. It's not flashy, it's not selling anything, and it maps fairly well onto what endocrinologists and urologists actually recommend in practice. That said, there are a few gaps worth examining, particularly around the framing of "good sperm" as a green light to keep going without monitoring.
Does the science back this up?
Yes, with some important caveats. Exogenous testosterone suppresses the hypothalamic-pituitary-gonadal (HPG) axis, reducing LH and FSH, which are the hormones that signal the testes to produce sperm. This isn't controversial. Studies consistently show that testosterone therapy causes azoospermia or severe oligospermia in a significant portion of men.
Jarow and Lipshultz (2019, Translational Andrology and Urology) reviewed the evidence and confirmed that exogenous testosterone is essentially a contraceptive in many men, though the effect varies. Coviello et al. (2004, JCEM) showed that low-dose intramuscular testosterone suppressed spermatogenesis in healthy young men within weeks. The advice to use HCG or clomiphene to counteract this is supported by multiple studies. Wenker et al. (2015, Journal of Urology) found that HCG co-administration during TRT could maintain intratesticular testosterone and preserve spermatogenesis. Clomiphene works upstream by stimulating LH and FSH release. Both approaches have real evidence behind them.
What did they get wrong (or right)?
Credit where it's due: the recommendation to do a semen analysis before assuming fertility is compromised is genuinely good advice. Not every man on TRT becomes azoospermic. The warning about duration, "the longer you're on testosterone, the longer the negative impact," is also supported by data. Recovery of spermatogenesis after stopping TRT can take 6 to 24 months, and longer treatment durations are associated with slower recovery (Liu et al., 2006, Journal of Clinical Endocrinology and Metabolism).
What's missing is the flip side of "your sperm is fine, carry on." A normal semen analysis today doesn't mean sperm will remain unaffected in six months. Testosterone's suppressive effects are not always immediate or consistent. Framing a single normal result as reassurance to keep going without any follow-up monitoring is an oversimplification. Men who want to conceive in the future should ideally be getting periodic semen analyses, not a one-time check. The video doesn't mention that at all, which is a real omission for a 9,800-view TikTok aimed at men making fertility decisions.
What should you actually know?
If you're on TRT and fertility matters to you, here's the fuller picture. First, exogenous testosterone is not a reliable contraceptive, but it does significantly impair sperm production in many men. The degree varies based on dose, formulation, duration of use, and individual response.
Second, a semen analysis is a reasonable starting point, but it should be paired with hormone labs, specifically LH, FSH, and total testosterone, to understand where suppression is happening. Third, if you want to preserve fertility while staying on TRT, HCG co-administration is the most studied approach. Clomiphene is an alternative, particularly for men who want to come off TRT and restore natural testosterone production alongside fertility.
Fourth, and this is important: if you're planning to conceive in the near future, a conversation with a reproductive urologist or a reproductive endocrinologist is worth more than a TikTok, including this one. Timing matters. Recovery from TRT-induced suppression is not guaranteed or fast, and waiting until you're ready to conceive to start addressing fertility is exactly the scenario Dr. Bellman warns against.
- Do not treat a single normal semen analysis as permanent clearance to stay on TRT without monitoring.
- HCG and clomiphene are not interchangeable. They work through different mechanisms and have different use cases.
- Pellet formulations of testosterone may have longer suppression windows due to sustained release, which is worth discussing with your provider.
- Sperm banking before starting TRT is an underused but practical option if future fertility is a concern.
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Cardiovascular Safety of Testosterone-Replacement Therapy
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Exogenous testosterone suppresses the HPG axis, leading to reduced intratesticular testosterone and impaired spermatogenesis in a variable but often significant proportion of men on TRT.
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Exogenous testosterone suppresses the HPG axis, leading to reduced intratesticular testosterone and impaired spermatogenesis in a variable but often significant proportion of men on TRT. Dr. Bellman recommends semen analysis as an initial fertility screen and suggests HCG or clomiphene for men who show azoospermia or oligospermia, both of which are evidence-supported interventions. The video does not address the need for serial monitoring in men who test normal initially, nor does it discuss recovery timelines after TRT discontinuation.
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What it helps with
- Exogenous testosterone suppresses the HPG axis, leading to reduced intratesticular testosterone and impaired spermatogenesis in a variable but often significant proportion of men on TRT. Dr. Bellman recommends semen analysis as an initial fertility screen and suggests HCG or clomiphene for men who show azoospermia or oligospermia, both of which are evidence-supported interventions. The video does not address the need for serial monitoring in men who test normal initially, nor does it discuss recovery timelines after TRT discontinuation.
- Studies show exogenous testosterone causes azoospermia or severe oligospermia in a substantial proportion of men, though the effect varies by individual, dose, and duration (Jarow and Lipshultz, 2019, Translational Andrology and Urology).
- A single normal semen analysis on TRT is not a permanent green light. Suppression can develop over weeks to months, and periodic retesting is advisable for men actively planning to conceive.
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- It may not cover eligibility, contraindications, medication interactions, lab history, or dose escalation.
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Start provider reviewWhat You'll Learn
- Studies show exogenous testosterone causes azoospermia or severe oligospermia in a substantial proportion of men, though the effect varies by individual, dose, and duration (Jarow and Lipshultz, 2019, Translational Andrology and Urology).
- A single normal semen analysis on TRT is not a permanent green light. Suppression can develop over weeks to months, and periodic retesting is advisable for men actively planning to conceive.
- HCG co-administration during TRT has the strongest evidence for preserving spermatogenesis. Clomiphene works through a different mechanism and is more useful for restoring natural production after stopping TRT.
- Recovery of sperm production after stopping TRT can take 6 to 24 months, and longer treatment durations are linked to slower recovery (Liu et al., 2006, JCEM). Waiting until you want to conceive to address fertility is a high-risk approach.
- Sperm banking before starting TRT is an underused option. For men who are certain they want biological children, banking before treatment eliminates the recovery timeline problem entirely.
- Testosterone pellets have a sustained-release profile that may extend suppression windows compared to shorter-acting formulations. Men on pellets should factor this into fertility planning timelines.
- Any man on TRT with fertility concerns should consult a reproductive urologist or reproductive endocrinologist, not manage this on the basis of a TikTok video alone, including this one.
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About the Creator
Dr Gary Bellman | SoCalUrology · TikTok creator
9.8K views on this video
Are you on testosterone and curious about your fertility? #Do a semen analysis! #fyp #doctorsoftiktok #trt #testosteronebooster #testosteronelevels #testosteronetherapy #testosteronepellets #urology
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Not medical advice. This video was made by Dr Gary Bellman | SoCalUrology, not by FormBlends. Our write-up above is an editorial review, not a medical recommendation. Talk to your doctor before making any decisions about medications or treatments.