Evidence & research
Randomised controlled trial
Also known as: rct · randomized controlled trial
A study in which participants are randomly assigned to treatment or control, isolating the drug’s effect from everything else.
In plain terms
Randomisation is what turns a correlation into a causal claim. It distributes the unknown confounders — motivation, diet, baseline health — evenly across groups, so a difference in outcome can be attributed to the intervention.
It is the reason a well-run trial in a hundred people outweighs ten thousand enthusiastic testimonials.
Guides that use this term
BPC-157 is one of the most confidently discussed peptides on the internet. PubMed indexes no completed randomized controlled trial of it in humans. Here is what does exist, and what it can support.
TB-500 is a fragment of thymosin beta-4, and the human trials people cite for it were run on the full-length protein. Here is what each has actually been shown to do.
CJC-1295, ipamorelin and MK-677 reliably raise growth hormone and IGF-1 in humans. What the trials have not shown is that raising those numbers produces the outcomes people take them for.
SURMOUNT-5 compared them directly over 72 weeks: tirzepatide produced 20.2% weight loss versus 13.7% for semaglutide. What that number does and does not settle.
One year after semaglutide was withdrawn, participants had regained two-thirds of the weight they lost, and their cardiometabolic gains reverted. The withdrawal trials, read honestly.
A 2026 meta-analysis found lean mass falls in absolute terms on GLP-1 drugs while rising as a proportion of body weight. Both statements are true, and they explain the entire argument.
Microdosing semaglutide or tirzepatide is widely discussed and has never been tested in a randomised trial. Here is what exists, what does not, and why the distinction matters.
Sources
Educational reference only. Pepperz does not provide medical advice, diagnosis, treatment, prescribing guidance, or dosing recommendations.