@tarzanofcali's TRT gains claims need context

What did @tarzanofcali actually say?

The creator describes four months on TRT and lists some genuinely striking changes: improved mood, sleep, and energy; first-ever facial hair growth; a shoe size jump from 7 to 10; growing half an inch in height at 26; and "insane" pumps and vascularity after just two weeks back in the gym. He also mentions his dosage was recently increased because testosterone levels were dropping toward the end of his injection cycle. He is 26 years old, and this appears to be ongoing treatment, not a completed one.

The tone is enthusiastic and personal. He is not telling anyone to start TRT, but at 22.2K views with hashtags like "teenagers" and "puberty," the implied audience is young men wondering if they should.

Does the science back this up?

Mostly yes on the mood, sleep, energy, and muscle-pump claims. On the height and shoe size claims, the science gets complicated fast, and not in a flattering way for the narrative.

Testosterone's effects on mood and energy in hypogonadal men are well-documented. A 2016 randomized trial by Snyder et al. in NEJM showed significant improvements in sexual function, mood, and walking ability in men with low testosterone. The gym performance and vascularity claims are also plausible. Testosterone increases erythropoiesis and muscle protein synthesis even over short periods, so two weeks of training on a therapeutic dose producing noticeable pumps is not far-fetched.

The facial hair claim is interesting. Testosterone does drive beard development through DHT conversion. If his pre-treatment levels were genuinely low during late adolescence or early adulthood, delayed secondary sex characteristic development is a recognized clinical finding. That part checks out.

What did they get wrong (or right)?

The height and shoe size claims are where this gets medically murky. Growing half an inch and jumping three shoe sizes at 26 on TRT is not a documented pharmacological effect of testosterone replacement in adults with closed growth plates. Epiphyseal plate closure typically occurs by the early-to-mid 20s. A 2020 review by Eastell et al. in Nature Reviews Endocrinology confirms that once growth plates are fused, exogenous androgens do not produce longitudinal bone growth.

Could some residual growth have occurred? Theoretically, if his plates were not fully closed due to prior hypogonadism delaying skeletal maturation, yes. But that is a clinical finding requiring imaging confirmation, not a casual "I grew half an inch" moment. The shoe size jump of three full sizes is even harder to explain physiologically. Ligament laxity changes or weight gain affecting foot spread are possible, but a 3-size jump is dramatic and lacks a credible mechanism at this age.

He got the acne right, at least. Acne from TRT is real and common, driven by DHT and sebum production.

What should you actually know?

If you are a young man watching this and thinking TRT sounds like a growth hack, that framing is dangerous. TRT is a clinical treatment for diagnosed hypogonadism, not a performance supplement. The creator appears to have a legitimate diagnosis, and the mood, energy, and muscle response he describes are consistent with treating an actual deficiency.

But the height and shoe size gains should not be the selling point anyone takes home. If a 26-year-old without prior hypogonadism-related delayed development starts TRT expecting to grow taller, that is not going to happen. Worse, exogenous testosterone in young men with normal levels suppresses natural production via the HPG axis and can impair fertility, sometimes for years. A 2021 paper by Kovac et al. in Fertility and Sterility found that up to 25% of men on exogenous testosterone had persistent spermatogenic suppression six months after stopping.

The dosage increase he mentions because levels were dropping at cycle's end is a real pharmacokinetic issue with testosterone cypionate and enanthate. That is a legitimate clinical conversation to have with a prescriber, not a red flag on its own.

• TRT for diagnosed hypogonadism has real, evidence-backed benefits for mood, energy, and body composition.
• Height and shoe size changes at 26 are not expected TRT outcomes and should not influence anyone's treatment decision.
• Acne is a real and common side effect, not a sign something is wrong with the dose.
• Young men without a diagnosis should not read this video as an endorsement to seek TRT for performance reasons.