TRT week-by-week updates: what the progress claims usually get wrong

What did @popethecoach actually say?

At week 8 of testosterone replacement therapy, this 25-year-old creator is reporting strength gains so fast he says low weight "feels like I'm just throwing it in there," plus reduced knee pain and less bruising at injection sites. He's injecting intramuscularly into his deltoid, says he's thought about switching to subcutaneous in the glute, but is holding off until after his first labs. He mentions taking heat from people for being 25 and on TRT.

That's a lot happening in a short clip. Some of it is physiologically coherent. Some of it deserves a second look. The part about waiting for labs before changing anything? That's actually the smartest thing he said.

Does the science back this up?

The strength and recovery improvements he's describing at 8 weeks are consistent with what the literature shows. But the knee pain clearing up is a more complicated story, and the deltoid injection site is worth unpacking.

On strength: testosterone's anabolic effects on skeletal muscle are well-documented. A landmark study by Bhasin et al. (1996, New England Journal of Medicine) showed significant increases in muscle size and strength with supraphysiological testosterone doses in healthy men. Replacement-dose TRT in hypogonadal men produces similar directional effects, though more modest. Eight weeks is a plausible window to start feeling them.

On joint pain: testosterone has shown some anti-inflammatory properties in animal models and small human trials. A study by Malkin et al. (2004, Heart) found reduced inflammatory markers in men on TRT. Whether that explains knee improvement here is genuinely unknown. It could also just be that he's training differently or sleeping better.

On deltoid IM injections: this is a legitimate and clinically used site. A review by Usach et al. (2019, Advances in Therapy) confirmed deltoid IM delivery produces adequate serum testosterone levels. It's less commonly discussed in patient communities but is not wrong.

What did they get wrong (or right)?

He got the "wait for labs before changing variables" approach right. That's basic clinical logic and a lot of self-administering TRT users ignore it. Give credit where it's due.

The age piece is more nuanced. He says people judge him "for only being 25 on TRT." That skepticism is not irrational. Prescribing TRT to men under 30 requires careful consideration because exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis, which can impair fertility and potentially affect endogenous testosterone production long-term. A paper by Ramasamy et al. (2014, Journal of Urology) specifically documented significant azoospermia in men on TRT. That's not disqualifying for TRT use, but it's not a trivial concern either, especially at 25. If he has confirmed hypogonadism with documented symptoms, TRT is clinically defensible. If he's chasing optimization without a clear diagnosis, that's a different conversation.

The sub-q glute idea he's floating is also legitimate. Subcutaneous testosterone injections have been shown to produce stable serum levels with potentially less variation than IM in some patients (Spratt et al., 2021, Journal of the Endocrine Society). His instinct to not switch mid-protocol is sound.

What should you actually know?

If you're a young man watching this and thinking TRT sounds like a good idea, here's what the evidence actually says you should do first.

• Get two separate morning total testosterone measurements before any clinical decision is made. One low reading is not a diagnosis. The Endocrine Society's 2018 clinical practice guidelines are explicit on this point.
• Understand that TRT suppresses your own testosterone production. If fertility matters to you now or later, that conversation needs to happen with a physician before starting, not after.
• Injection site bruising decreasing over time is a normal learning curve, not a sign that something physiological has shifted. Technique improves. That's it.
• Deltoid IM injections are valid but require attention to needle length and injection volume. Overdoing volume in a smaller muscle group increases local irritation risk.
• "Feeling stronger" at 8 weeks is real, but placebo effects in testosterone trials are substantial. Ribeiro et al. (2020, Psychoneuroendocrinology) documented significant expectation-driven performance improvements in testosterone studies. Labs, not vibes, tell you what's actually happening.

The bottom line

This creator is not spreading misinformation. He's documenting a personal experience with reasonable self-awareness and appropriate caution about changing variables. The strength and recovery improvements he's feeling at 8 weeks are physiologically plausible. The age-related skepticism he's receiving from others is not baseless, even if it's not disqualifying. The most important thing he said was that he's waiting for labs. Everyone on TRT should be doing exactly that, and many aren't.