Editorial policy

Peptides and the scientific evidence about them: collagen and other oral peptides, skin-care peptides, and unapproved compounds sold for injury recovery or performance, plus the regulatory picture for the latter. Products are not graded or ranked.

We look for peer-reviewed research in PubMed on the peptides and topics covered. The aim is to include studies whatever they found, positive, negative or null, and to describe each design honestly. Reviews are labelled as reviews, and animal and cell studies are labelled as such, so a reader can see how much of the evidence comes from people.

Each summary is written from the study's abstract, in our own words, and says what was found, what the study cannot show, and who paid for it. A summary only claims what the abstract supports. Anything an article or a brand claims about a paper that the abstract does not support is recorded on the study page as unverified. Because we work from abstracts, a summary can miss detail that appears only in the full text.

PubMed IDs, DOIs and PMC IDs come from PubMed. A script compares every study with PubMed's record (first author, year, DOI and PMC ID) so that a link cannot silently point at the wrong paper. This checks identifiers; it does not check whether a summary matches the paper, which takes a person reading it.

We report the funding and conflict-of-interest statements as the PubMed record states them. If a record says nothing, the study page says so and points to the full text. Industry funding is noted, not treated as disqualifying.

Topic pages rate the evidence for each peptide or use with a hand-written verdict and a review date. A verdict reflects only the studies summarised on this site. The levels are explained on the methodology page.

When a published claim, summary, identifier, verdict or date is found to be wrong, we fix it and record the change, with the date and what the page said before, in the corrections log.

This site is run by an employee of Pürblack, a peptide supplement brand, in a personal capacity. Pürblack does not fund, review or direct the site, and its costs are paid by its operator.

No product is currently graded or ranked on this site. Any page that names, links or grades a Pürblack product will carry this disclosure beside it.

Regulatory pages are written from FDA, HHS and Federal Register documents wherever they exist, show the date they were last reviewed, and label news reports as news. They are not legal advice.