What did @kmartfit actually say?
The claim is simple: you can "optimize your testosterone while keeping your fertility" on TRT. @kmartfit doesn't explain how. The video is essentially an ad for a clinic called Harley Med, framed as fertility advice. To his credit, he acknowledges that fertility loss is a real concern for men considering TRT. That part is accurate. But the suggestion that TRT itself preserves fertility is where things get complicated.
The video offers no mechanism, no caveats, and no acknowledgment that standard TRT, without adjunct therapy, almost universally suppresses sperm production. That omission isn't a minor detail. It's the whole story.
Does the science back this up?
Not in the way the video implies. Exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis. When your brain detects enough testosterone in the bloodstream, it stops signaling the testes to produce more, and it stops triggering sperm production along the way. This is well-established physiology.
A 2021 review by Crosnoe-Shipley et al. in Translational Andrology and Urology confirmed that exogenous testosterone is essentially a contraceptive. Sperm counts drop to near-zero in a significant percentage of men within months of starting TRT. The World Health Organization studied testosterone as a male contraceptive for exactly this reason.
There are legitimate strategies to preserve fertility on testosterone, specifically human chorionic gonadotropin (hCG), clomiphene citrate, or both. These work by mimicking LH or stimulating the pituitary to maintain intratesticular testosterone and sperm production. Ramasamy et al. (2015, Journal of Urology) found that hCG co-administration can maintain spermatogenesis in men on testosterone therapy. That is what @kmartfit should have mentioned. He didn't.
What did they get wrong (or right)?
He got the problem right: TRT does threaten fertility, and men should think about this before starting. That concern is valid and worth raising on a platform like TikTok where plenty of guys are considering TRT without understanding the tradeoffs.
What he got wrong is the framing. Saying a clinic helps men "keep their fertility" on TRT implies the clinic has a solution baked into the TRT protocol. Maybe they do offer hCG or clomiphene. But nothing in the video says that. Without that context, a 22-year-old watching this could conclude that TRT at the right clinic just, somehow, doesn't affect fertility. That is not true.
The video is also a thinly veiled referral ad. "Comment TRT and I'll send you the info" is a direct marketing funnel. That doesn't make the clinic bad, but it means viewers should apply extra skepticism to the fertility claims being used to sell it.
What should you actually know?
If preserving fertility matters to you, standard TRT is not your only option, and it may not be your best one. Here is what the evidence actually supports:
- hCG (human chorionic gonadotropin) can maintain intratesticular testosterone and spermatogenesis when added to a TRT protocol. It mimics LH and keeps the testes active.
- Clomiphene citrate (Clomid) stimulates endogenous testosterone production without shutting down the HPG axis, making it fertility-neutral in many cases. Katz et al. (2012, BJU International) showed meaningful testosterone increases with preserved sperm parameters.
- Sperm banking before starting TRT is a straightforward, low-cost safety net that almost no TRT content creators mention.
- Recovery of fertility after stopping TRT is possible but not guaranteed, and timelines vary widely. Liu et al. (2006, Journal of Clinical Endocrinology and Metabolism) found median recovery times of several months, but some men took over two years.
Any clinic marketing TRT as fertility-safe owes you a clear explanation of which protocol they use and why. Ask specifically whether hCG or clomiphene is included, and get that in writing.