Editorial policy

How articles on this site are researched, sourced, checked and updated.

Research

We start from primary sources: peer-reviewed studies, systematic reviews, and fact sheets from bodies such as the NIH Office of Dietary Supplements, the WHO and national health services. We do not cite manufacturer websites as evidence for a health claim. Brand pages are used only for product specifications and prices.

Language

Supplements rarely have strong evidence. Our wording reflects that. We write "research suggests" or "may help" unless a specific citation supports something stronger. We do not use the words "cures", "guaranteed" or "clinically proven" without a study reference beside them.

Fact-checking

Before an article is published, a human editor replaces every claim placeholder with a real citation, verifies dosage figures against medical sources, and checks that product prices and availability are current. Articles that give dosage guidance are additionally reviewed by a registered dietitian where marked "Fact-checked by" at the top of the page.

Updates

Every article shows a "Last updated" date. We re-check prices and availability on each update, and we re-check the underlying evidence at least once a year. Substantive changes are listed under "What changed since first published" on the article.

Corrections

If you spot an error, contact us. We correct within seven days and record the correction on the page.

Product selection

Products are chosen on the strength of their formulation, third-party testing where available, and value. Whether a brand has an affiliate programme does not affect whether it is included or where it ranks. See our affiliate disclosure.