Research Methods
How to read a peptide study before you quote it
Six checks stop a methods section from being laundered into a claim: model, size, route, endpoint, control, and conflict.
Peptide papers are not hard to misread, because the interesting sentence is usually in the abstract and the constraint is in the methods. A reliable summary answers six questions before it repeats a result.
Model and number
Was this cells, mice, rats, or people? If people, was it a case series, a phase 1 kinetic study, or a randomized trial? How many subjects sat in the arm being quoted? A result in twelve rats can be real and still be the wrong kind of evidence for a human claim.
Route and endpoint
Intraperitoneal injection in a rat, a topical cream, and a subcutaneous research vial are different experiments. Quote the route the paper used, and do not convert it. Then name the endpoint the authors powered for. A hormone level, a wound width, a CT measure of visceral fat, and a patient-reported score are not substitutes for one another.
Control and conflict
Placebo, vehicle, and active comparator answer different questions. “Improved” with no comparator means “changed from baseline,” which is weaker. Funding and invention disclosures belong in the summary when the sponsor wrote the protocol, as they did for several of the trials this journal covers. None of these checks requires a product link. They require the paper.