A doctor with 8 million YouTube views just told his audience peptides are mostly marketing.
Two weeks earlier, UCLA published a review saying the same thing.
He's half right.
UCLA's team went through every study they could find on six of the most popular peptides.
That part is real. Most of what gets quoted about BPC-157 comes from rats. We flag it on every row of the Peptide Cheat Sheet.
Here's the half he skipped.
Hundreds of thousands of people aren't all imagining it
One stem cell researcher told STAT that "potentially hundreds of thousands of people" are already taking these compounds. Spend an hour in the forums and you'll see why. People report less chronic pain, faster recovery from training, calmer focus.
I know people who swear by BPC-157 and GHK-Cu. I know people using Semax and Selank in place of Adderall and Xanax. I've run retatrutide and tesamorelin together myself, and I got great results.
Writing all of that off as placebo is lazy. Treating it as proof is just as lazy.
Anecdotes are real data. They're low-resolution data, and they have four blind spots:
The people who felt nothing don't post. You only hear from the wins.
Placebo hits hardest right where peptides get used most: pain, anxiety, focus, sleep.
Nobody changes one thing at a time. New peptide, new training block, better sleep, all in the same month.
You don't always know what's in the vial. UCLA's review flagged arsenic and lead in some products.
The bad reports get buried too. STAT found users describing intense anxiety, losing the ability to feel pleasure, and unexplained itching. Nobody can say for sure what caused those either. That's the whole problem with anecdotes, in both directions.
Why the trials don't exist
Here's what the "trust the science" crowd skips. For a lot of these compounds, nobody ran the trial because nobody could make money from it.
BPC-157's sequence is public. There's no patent worth filing, so no company is going to spend hundreds of millions on a phase 3 for something anyone can already buy. A human trial registered in 2015 was withdrawn with no data ever released.
Be fair in both directions, though. Almost all of the BPC-157 rat research comes from one Croatian lab, and its lead researcher holds patents on it. The pro side has its own conflict of interest.
No trial means nobody paid for the answer yet.
Some of these have more science than the skeptics admit
Tesamorelin is an FDA-approved drug. Two phase 3 trials with 816 patients got it approved in 2010. The catch is who was enrolled: people with HIV-associated lipodystrophy.
Retatrutide has a phase 2 trial in the New England Journal of Medicine and phase 3 readouts coming in.
Selank was approved in Russia for anxiety in 2009. A 62-patient Russian trial put it head to head with a benzodiazepine and found similar anxiety scores. It's small and was never replicated in the West, but that's a long way from "no evidence."
Semax is on Russia's official list of essential medicines.
A lot of the time, "no evidence" really means "no American evidence."
One thing to be clear on, though. If you're on a benzo, don't come off it on your own. Benzo withdrawal can cause seizures. Do that with a doctor.
So do we "trust the science"?
The top comment under that 8-million-view video, with 31,000 likes, says the same people who were skeptical of vaccines are now "shooting themselves full of underground lab chemical compounds."
Here's the part that commenter misses. After 2020, "trust the science" stopped meaning "look at the evidence" and started meaning "trust the people in charge." When those people got things wrong, they rarely said so. People noticed. That's a big reason a gray market with hundreds of thousands of buyers exists at all.
Science is a method. It was never supposed to be an authority. On most of these compounds, the method's honest answer is "we don't know yet." That's a different sentence from "it doesn't work," and a different sentence from "my buddy's shoulder feels great."
So act like the researchers would. Get baseline bloodwork before anything. Change one thing at a time. Keep a log of what you did and what changed. And look at the COA for what's actually in the vial.
The Peptide Evidence Sheet
The six compounds from the UCLA review, on one page. For each one:
What was actually tested in humans
Who the trial enrolled
What happened, including the trials that missed
What's still missing
The paper it came from
Each one gets a grade: Animal, Small human, Human RCT, or Topical only.
Next time someone sends you that video, check which row they're talking about. And if they tell you it's all fake, ask them who was supposed to pay for the trial.
P.S. The full 25-peptide Cheat Sheet is linked at the bottom of the page too, along with the two suppliers we work with and trust: American Peptide Research (US) and Great North Bio (Canada). The Biohacker Network is an affiliate of both and may earn a commission. Research reference, not medical advice.