Does TRT actually shut down natural testosterone production?

What did @kmartfit actually say?

The creator's core claim is straightforward: yes, TRT suppresses natural testosterone production, but pairing injectable testosterone with either enclomiphene or HCG can keep your body's own production running. He calls solo injectable TRT "old school" and says modern protocols use lower doses plus these add-ons. He also states he personally takes enclomiphene three times a week at 25mg and has experienced no testicular atrophy and has maintained fertility.

One thing to flag immediately: he calls the drug "N-clomaphine" throughout, which appears to be a pronunciation error. The compound he is describing is enclomiphene citrate, a selective estrogen receptor modulator (SERM). This is worth clarifying because people searching for information after watching this video may not find what they need.

Does the science back this up?

Partially, yes. The suppression claim is solid. Exogenous testosterone reliably suppresses the hypothalamic-pituitary-gonadal (HPG) axis. Your brain detects circulating testosterone, stops releasing GnRH, and LH and FSH levels drop. Without LH stimulation, the testes reduce production and can physically shrink. This is not controversial. Kim et al. (2013, Journal of Urology) documented significant testicular volume loss in men on exogenous testosterone without co-treatment.

Where things get more complicated is the "enclomiphene and HCG do essentially the same exact thing" claim. They do both stimulate testosterone production, but through different mechanisms. HCG mimics LH directly at the testicular receptor. Enclomiphene blocks estrogen receptors in the hypothalamus, which increases endogenous LH and FSH secretion. That upstream vs. downstream difference matters clinically. Wiehle et al. (2014, Andrology) showed enclomiphene raised testosterone and LH simultaneously, while HCG raises testosterone but suppresses LH. Saying they are "the same exact thing" oversimplifies a meaningful pharmacological difference.

What did they get wrong (or right)?

Credit where it is due: the creator is right that HPG axis suppression is a real and documented side effect of TRT, and right that co-treatments exist to address it. This is not fringe information. Fertility preservation on TRT is a legitimate clinical concern, and the conversation around it has matured significantly. Pointing people toward that reality is genuinely useful.

What he got wrong: the equivalency framing. Enclomiphene and HCG do not "do the same exact thing." HCG works peripherally at the testes; enclomiphene works centrally at the hypothalamus. Their FSH profiles differ, which matters for sperm production. A man primarily concerned with fertility might respond differently to each option. Coviello et al. (2004, Journal of Clinical Endocrinology and Metabolism) showed HCG maintains intratesticular testosterone but does not necessarily preserve FSH-driven spermatogenesis the way a SERM can.

He also promotes himself as a referral source for starting TRT online, which is a commercial interest disclosure that is absent from the video. Viewers should know that context.

What should you actually know?

If you are on TRT and care about fertility or testicular function, the research supports asking your prescriber about adjunct options. That conversation should happen with a licensed clinician who can review your labs, not based on a TikTok anecdote. Enclomiphene is not FDA-approved for use in men and is available through compounding pharmacies in the US, which means quality and dosing consistency can vary. That is a real limitation the video does not mention.

The idea that "modern" TRT always includes these adjuncts is also not universally true. Many protocols are individualized. Some men on TRT are not concerned with fertility preservation and do fine without adjunct therapy. Blanket statements about what constitutes current standard practice can set inaccurate expectations.

• Suppression of the HPG axis on TRT is real and well-documented.
• Adjunct therapies like HCG and enclomiphene can mitigate this, but they are not interchangeable.
• Anyone starting TRT should have a baseline semen analysis if fertility matters to them.
• Enclomiphene's regulatory status and compounding variability are relevant considerations a video like this omits.