TRT supplement claims on TikTok: what the evidence shows

What did @jonasdundjakob actually say?

Honestly? It's not clear. The transcript from this video is largely incoherent, a string of fragmented sentences that reference "a book," something called "Bloot and Bloot," the University of New Zealand, and vague mentions of cancer and health. There are no legible claims about testosterone, TRT protocols, hormones, or supplements that can be extracted and evaluated. The video is tagged under the TRT category and carries an advertising disclosure with a supplement discount code, which means viewers are being sold something, even if nobody can tell what the creator is actually arguing.

Direct quotes from the transcript include fragments like "the story is called Bloot and Bloot" and "the University of New Zealand was a living health in the world," neither of which maps to any recognizable medical or scientific claim. This could be a transcription failure, a language barrier, or a video where no substantive health claim was actually made. Either way, the content as captured is not evaluable on scientific grounds.

Does the science back this up?

There is nothing coherent here to test against the literature. That said, since the video sits in a TRT category and promotes a supplement vendor, it is worth noting what the actual science on testosterone optimization says, so viewers have a baseline.

Testosterone replacement therapy for diagnosed hypogonadism is well-supported. Bhasin et al. (2010, New England Journal of Medicine) established that testosterone deficiency, defined as consistently low serum testosterone with clinical symptoms, responds to replacement therapy with measurable improvements in bone density, lean mass, and libido. More recently, the TRAVERSE trial (Lincoff et al., 2023, New England Journal of Medicine) found that testosterone therapy in middle-aged men with hypogonadism did not increase major cardiovascular events compared to placebo, addressing a longstanding safety concern. None of this, however, is what this video discusses in any traceable way.

What did they get wrong (or right)?

Because no clear claim can be extracted, there is nothing to grade as right or wrong in the conventional sense. What can be noted is what the video does structurally: it carries an advertising tag for a supplement distributor (Vitaminversand24) while being filed under TRT content, a category that attracts viewers actively researching hormone therapy. That combination, vague health-adjacent framing plus a direct product code, is a pattern worth being skeptical about regardless of what was said.

The reference to "the University of New Zealand" doing something significant is unverifiable. No major testosterone or endocrinology research is commonly attributed to a single New Zealand university in a way that would make this reference meaningful. It may be a mistranscription of an institution name, but as presented it cannot be confirmed or refuted.

What should you actually know?

If you landed on this video because you are researching TRT, here is what is actually worth knowing. TRT is a medical treatment for a diagnosed condition, not a general wellness upgrade. The Endocrine Society guidelines (Bhasin et al., 2018, Journal of Clinical Endocrinology and Metabolism) recommend against initiating testosterone therapy without confirmed low serum testosterone measured on two separate morning blood draws, plus clinical symptoms of deficiency.

Supplement vendors using TRT-adjacent content to sell products occupy a gray zone. Supplements are not regulated the same way as prescription testosterone, and no over-the-counter product legally replaces a controlled hormone. If a creator is pairing vague hormone content with a discount code, ask what specifically they are selling and whether it has clinical evidence behind it, not just a promotional partnership. The advertising disclosure here is legally correct to include, but it does not tell you whether the product does anything.