Rolling thread: post a claim you have seen, somebody will check it

A rolling thread rather than a new one each time.

Post a specific claim you have seen about a compound — from a product page, a video, a friend, anywhere. Quote it as closely as you can and say where it came from if you can without naming a seller. Somebody will go and look.

Two rules on top of the site rules. Quote the claim, do not paraphrase it into something easier to knock down. And "I checked and it is roughly right" is a valid answer — this is not a debunking thread, it is a checking thread, and a thread that only ever finds fault is not checking anything.

First one. Seen repeatedly, phrased almost identically each time:

"BPC-157 has been shown to heal tendons in over 200 studies."

Checked as far as anyone can.

The number is not obviously wrong if you count everything with BPC-157 in it across three decades — gut, tendon, muscle, nerve, in rodents. Where it fails is "heal tendons" and the implied subject.

Nothing in that body of work is a completed human tendon trial. The count is real and the sentence it is supporting is not. Every study behind it is an animal or a cell study, and the sentence is written to be read as though it were about people.

Also, as covered in the evidence thread, a large share traces to one group, so "200 studies" overstates the independence as well as the species.

Verdict: number roughly defensible, claim not.

That is a very clean example of a true number attached to a false sentence.

Next:

"Peptides are safer than steroids because they work with your body's own systems."

This one is a category error dressed as a comparison, and it is probably the single most common thing said in this space.

"Works with your body's own systems" describes almost every drug ever made. Opioids work with your body's own opioid receptors. Insulin is your body's own molecule. Neither of those facts makes them safe, and the second one kills people every year through dosing error.

The comparison is also to a category, not a compound. "Peptides" spans approved medicines with decades of safety data and unlabelled powders with none. Any sentence starting "peptides are safer than" is comparing a thing to a set.

Verdict: not a claim that can be true or false as stated, which is why it is so durable.

"Not a claim that can be true or false" is somehow more damning than wrong.

"Retatrutide is basically a stronger Mounjaro."

Roughly right in effect, wrong in mechanism, and the mechanism matters here.

Tirzepatide is dual: GLP-1 and GIP. Retatrutide is triple: those two plus glucagon. So it is not the same drug turned up, it is a different drug with an additional pathway — and the glucagon arm is the one doing something the other does not do at all.

Effect size does order that way in trials, so "stronger" is not misleading about outcome. But "basically" is carrying the assumption that the adverse effect profile scales the same way, and it does not — the dysesthesia signal on retatrutide has no counterpart in the tirzepatide data.

Verdict: right about magnitude, wrong about it being the same thing more so.

The "basically" doing all the work again.

It usually is.

From a serum listing:

"Clinically proven to reduce wrinkle depth by up to 30%."

I will start it off since it is my area. "Up to" is doing the work, and it is the strongest hedge in cosmetics — it is satisfied by one participant in one study.

But I do not think the whole thing is empty, and I would like somebody to argue with me.

I will half-argue.

The underlying figure is real — Argireline studies do report reductions in that range on instrumental measures. So this is not an invented number.

What "clinically proven" is hiding: small studies, frequently manufacturer-funded, measuring instrumented wrinkle depth rather than anything a person would notice, over weeks, against a vehicle control that is itself a moisturiser. And "up to" then selects the best result from that.

Verdict: the number exists, "clinically proven" is doing more work than the clinic did. Not fabricated, which is a real distinction and worth saying in a thread like this.

That is the answer I wanted and I accept the correction on tone. It is a real number badly framed rather than a fiction.

Heard in a gym, verbatim:

"TB-500 has human trials, it's been through the FDA."

Two claims and they fail differently.

"Has human trials" — thymosin beta-4, the full protein, has. What is sold as TB-500 is generally a fragment. So this is true of a related molecule and being said about the one in the vial. Borrowed evidence, one molecule over.

"Been through the FDA" — no. Investigational work is not approval, and there is no marketing authorisation. If anything the FDA's public position on this class of compound runs the other way.

Verdict: first half misattributed, second half simply false.

Thought so on the second. The first is subtler than I would have caught.

"Store at -20°C for maximum stability."

Posting my own because it is the one piece of advice I see that is right in the general case and produces the wrong behaviour in the specific one.

Dry lyophilised powder, long term: yes, cold is better, and a freezer is appropriate.

Reconstituted solution: freezing is a decision with costs, not a default. Ice crystal formation, solute concentration in the unfrozen fraction, pH shifts as buffer components crystallise at different temperatures. And in practice the person following this advice thaws and refreezes the same vial repeatedly, which is the worst available option.

Verdict: correct for powder, actively harmful as a blanket rule. See the storage post.