Editorial policy

Sourcing hierarchy

Every dose, interaction, contraindication, and health claim must trace to a primary source, in this order of authority:

• NIH Office of Dietary Supplements fact sheets
• FDA labels and safety communications; peer-reviewed literature via PubMed / PMC
• NHS and BNF (for UK guidance)
• The EFSA register of authorised health claims (for UK/EU claim wording)

Each figure is cross-checked against a second source before publication. We never lift doses or claims from another affiliate or review site — competitor content is not a source, however often it is repeated.

Ranges, not invented precision

Where the evidence supports a range, we publish the range. Where sources disagree — on an optimal dose, a blood-level threshold, an effect size — we say so and show both figures with their sources, rather than picking the one that makes a cleaner headline. A result from a single small trial is labelled as exactly that. Numbers in our tables are the numbers the studies used; if no study supports a dose, the guide says the dose is customary, not studied.

Claims rules — US and UK are different

• US pages: structure/function wording only ("supports", "helps maintain"), each use covered by the standard FDA disclaimer: "These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease." No disease-treatment claims, ever.
• UK pages: only health claims authorised on the GB/EFSA registers, in authorised wording. US claims are not portable to UK pages, and UK editions are re-checked claim by claim rather than copied. Some ingredients discussed for the US (for example melatonin) are prescription-only in the UK and are labelled as such, never promoted to UK readers.
• Banned framings, sitewide: "nature's Ozempic" and any drug-comparison framing; hormone claims with a percentage attached ("boosts testosterone by X%") without a randomised controlled trial behind them; detox and cleanse claims; cure, treatment, or miracle language; and before/after promises of any kind.

Product criteria

• Top picks must carry recognised third-party testing: NSF Certified for Sport, Informed Sport, or USP Verified where a certified option exists.
• No proprietary blends in top picks — if the label hides the dose, the product doesn't lead a table.
• We do not print prices. Prices change constantly and retailer rules prohibit hard-coded pricing; check the live price at the retailer.
• Commissions never decide rankings. Where we earn differs by retailer; what we recommend doesn't.

Medical review

Money and hub pages are verified by our named medical reviewer against a per-article verification table before they carry the "Medically reviewed" stamp. Informational pages launch with primary citations and are stamped in batches.

Corrections and updates

Found an error? Tell us via the contact page with the page URL and the source you believe contradicts us. Verified errors are corrected, the page's updated date is changed, and any review stamp is reset until the page is re-checked. We do not quietly rewrite history: a correction that changes a recommendation changes the page's updated date as well.

Update cadence

Supplement guidance moves, and pages here are re-checked on a schedule rather than left to age. Money and hub pages are re-verified against their primary sources at least once a year, and sooner whenever a source agency — NIH ODS, the FDA, NHS/BNF, or EFSA — changes its guidance, a cited trial is retracted or superseded, or a recommended product changes its formula or loses its third-party certification. Re-verification repeats the original process: the verification table is rebuilt from the sources, the reviewer re-confirms the stamped pages, and the review date moves to the new check. Informational and pair pages are swept in batches on the same triggers.