Checking the claims

When A Sales Page Cites The Wrong Paper

Citations at the foot of a sales page are meant to be reassuring, and almost nobody opens them. They take under a minute each to check. Here is what happened when the twelve on this product's own sales page were checked, one at a time.

By VigorHorse Team · Last updated November 4, 2026 · 9 min read · Checking the claims · Reviewed by Dr. Edmund Ko, MD

Why anybody would check a reference list

A numbered list of studies at the bottom of a sales page performs a specific job. It signals that the claims above it rest on something, and it does that job whether or not anybody reads it. In practice almost nobody does.

That makes it the single most informative thing on the page for a reader willing to spend three minutes, because it is a claim about the seller rather than about the product. A list that checks out was assembled by somebody who opened the papers. A list that does not was assembled by somebody who did not, and the rest of the page came from the same desk.

This is the fourth of the seven checks in the scorecard, and it is the one that most often separates two products that look identical on the shelf.

How to check one, in under a minute

The mechanics are trivial, which is the point. Every PubMed identifier is a number that resolves to exactly one record.

Under three minutes for three references. It tests how the page was assembled, which is information you cannot get any other way.

Pick the references at random rather than starting at one. A list assembled carelessly is often correct at the top, where whoever built it was still paying attention, and drifts further down.

What the twelve looked like

Read on 19 September 2026, the seller's page carried twelve numbered references. Eight resolve correctly to the papers they name. Three carry an identifier belonging to a different article. The twelfth carries no identifier at all.

None of the three mismatches is subtle. In each case the number leads to a paper on an unrelated subject, in an unrelated field, which is the signature of identifiers transcribed from somewhere rather than looked up.

Read on 19 September 2026. Three identifiers resolve to unrelated articles and the fourth entry has no identifier at all. The right-hand column gives the corrected reference, which is the one this website cites.

Reference eight: a paper about biotechnology

The eighth entry names a urologist's guide to ingredients found in top-selling nutraceutical supplements. That is a genuinely useful paper and a sensible thing to cite on a page selling a male vitality product.

The identifier printed beside it leads to Pfleger and Prather, “Biological synthesis unbounded?”, published in Nature Biotechnology in 2015. That is a commentary on metabolic engineering. It is not about urology, nutraceuticals or supplements.

The paper the entry means exists and is easy to find. Its identifier differs from the printed one, and it is the one cited across this website.

Reference nine: a paper about kaempferol

The ninth entry names a review of the efficacy and safety of common ingredients in supplements marketed for sexual function, which is again exactly the right sort of reference for the claim it sits under.

The identifier leads to Kitakaze and colleagues, on kaempferol and drug-metabolising enzymes, in Food & Function in 2020. A flavonoid paper, in a food science journal, on a different question.

The review the entry means is a real paper with its own identifier, and it is cited here under the correct one.

Reference eleven: the article on the previous page

The eleventh is the most revealing of the three, because the error is one digit.

The entry names a paper on a catuaba-containing product. The identifier printed beside it leads to Upadhyay, a study of prostane in the treatment of benign prostatic hyperplasia. That article was printed immediately before the intended one, in the same issue of the same journal.

Two consecutive identifiers in one issue is how a reference gets copied off a contents page rather than out of the paper. The study the entry means is the next number along, and it is the one this website cites.

Reference twelve: under review

The twelfth entry is different in kind. It is attributed to Mansour and colleagues, and it carries no journal, no year and no identifier. The page annotates it as being under final scientific review.

Searching for it returns no matching record. That phrase has no standing in publishing: a paper is either published, in press at a named journal, or a preprint with a server and an identifier of its own. None of those descriptions fits an entry with no journal name.

Taken on its own this is the least serious of the four, because at least nothing is being misattributed. It is listed here because it appears in the same numbered list as the other eleven and carries the same implied authority.

What this does and does not tell you

Being precise about the conclusion matters more here than anywhere else on this website, because it would be easy to overreach.

• It does not mean the underlying science is wrong. The papers the list means to cite are real, and several are good.
• It does not mean the product is unsafe. A citation error is about a web page, not about a manufacturing process.
• It does not mean the errors were deliberate. Transcription mistakes are ordinary, and one digit is an easy slip to make.
• It does mean nobody opened these three before publishing them, because opening one takes a few seconds and the mismatch is immediate.
• It does mean the rest of the page's factual claims need independent confirmation before you rely on them.

That last point is the practical one and the reason this check earns its place. A reference list is a promise that somebody checked. Where the promise does not hold, the page is worth nothing to you as a source, and every claim on it has to be verified somewhere else or set aside.

The papers themselves are worth reading

It would be a poor outcome if the only thing taken from this post were that a sales page made mistakes. The corrected references are among the most useful public writing in this category.

The urologist's guide walks the ingredients in the best-selling supplements in this aisle and says what is behind each one, which is the single most efficient way to orient yourself. The aphrodisiacs review covers efficacy and safety for the common ingredients together.

A review of herbal dietary supplements for erectile dysfunction and a 2026 systematic review between them give the pooled picture across the category. And the catuaba identity analysis is the one that reframes the whole aisle: of fourteen commercial catuaba samples examined, most were not the botanical their own labels named.

All five are open to anybody with a browser, which is what makes a reference list checkable in the first place.

References