What did @kmartfit actually say?
He described his first week on testosterone replacement therapy as producing "the best workout of my entire life" and energy levels he called "insane." Critically, he walked it back himself, saying it was "probably 100% in my head" because testosterone takes time to show full benefits. That's a meaningful admission, and it's the most accurate thing in the video.
The setup here matters: he framed this as a personal memory from three years ago, not a claim about how TRT universally works. He was addressing low testosterone symptoms he'd been dealing with "for years" and was newly diagnosed and treated. He's not telling you that you'll feel this way. That framing keeps the video from being outright misleading, even if the headline energy is still pretty breathless.
Does the science back this up?
On the placebo point, yes, absolutely. The physiology doesn't support a one-week testosterone-driven performance boost, but the psychology absolutely does. The evidence on expectation effects in exercise performance is robust enough that this isn't even a fringe idea.
Testosterone cypionate, the most common injectable used in TRT, has a half-life of roughly 8 days. After a single injection, serum levels are still climbing toward peak in the first few days and haven't had time to meaningfully alter muscle protein synthesis, red blood cell production, or neuromuscular efficiency. A 2020 review by Bhasin et al. in the New England Journal of Medicine confirmed that measurable body composition changes from testosterone therapy typically require 3 to 6 months of consistent treatment. One week is nowhere near that window.
What can happen fast, though, is mood. Some men report improved sense of wellbeing within days of starting TRT, which has been attributed to testosterone's rapid effects on dopaminergic signaling rather than muscle physiology. That's a real, documented phenomenon, and it likely explains part of what he experienced.
What did they get right or wrong?
He got the core pharmacology right by accident. Saying the gym high was "probably 100% in my head" is actually the scientifically defensible position. Placebo responses in exercise studies are well-documented. A 2014 study by McClung et al. in the Journal of Applied Physiology showed expectation alone significantly altered perceived exertion and performance outcomes in resistance training contexts.
Where the video gets slippery is in the framing. Calling that first week "insane" energy and the best workout of his life, even with the caveat, plants a very specific expectation in viewers who are considering TRT. If you're watching this with low testosterone symptoms and hoping for relief, you're going to latch onto the highlight reel, not the footnote. That's a real concern for a platform where people make health decisions based on content like this.
He also conflates feeling pumped up with TRT working. The therapy may have been the right call for him. But the first-week gym euphoria wasn't TRT working. It was anticipation, relief, and a good night's sleep, maybe.
What should you actually know?
If you're starting TRT and feel amazing in week one, that's not the testosterone. That's your nervous system responding to the belief that your problem is finally being addressed. It's not nothing, but it's not pharmacology.
Real TRT results follow a slower curve. According to a 2013 meta-analysis by Isidori et al. in the European Journal of Endocrinology, libido improvements tend to appear within 3 weeks, energy and mood stabilization around 3 to 6 weeks, and lean mass changes not until 3 to 6 months. Cardiovascular risk markers and red blood cell count changes can take even longer.
This matters practically because men who expect immediate physical results from TRT sometimes make poor decisions: pushing training volume too hard too fast, attributing gains to the therapy before it's had time to act, or getting discouraged when the week-one high fades. Understanding the timeline prevents those mistakes.
TRT is also not consequence-free. It suppresses the hypothalamic-pituitary-gonadal axis, can reduce sperm production, and requires monitoring of hematocrit, PSA, and lipids. Anyone starting it should be doing so under licensed medical supervision with baseline and follow-up labs, not based on a TikTok comment section.