Editorial policy
supp.fit summarises published research on supplements and the labels of supplement products. It is information, not medical advice: talk to a doctor before you start, stop or combine supplements.
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Where the evidence comes from
Studies come from PubMed. Each supplement has its own search, and the search is repeated over time.
A study is shown only when it has at least 30 participants and a relevance score of at least 50 for one benefit, or 60 when it is matched to several benefits of the same supplement. These fixed thresholds decide what is shown, not a model.
The grade of a claim is computed by a formula from the number of qualifying studies and the number of participants in them. The same studies always give the same grade. The full method is on our method page.
What software writes, and what a person checks
- A language model reads each study and records it as fields: the number of participants, the outcome measured, the direction of the change and a strength rating. A study is saved only when every field is present.
- A second model scores how relevant each study is to each benefit. The thresholds above decide what is shown.
- The quality score of a product is written by a language model against a fixed set of criteria. The page labels it as an AI score.
- The short paragraph on an ingredient page is written by a language model from facts in our database. An automatic check refuses a paragraph that recommends a dose, makes a safety statement or claims a health benefit.
No person reads each page before it is published. People read the reports that readers send, and correct what is wrong.
Where product data comes from
Product listings come from a snapshot of supplement listings on online marketplaces. The name the seller wrote is shown on each product page as it was written.
A Supplement Facts panel comes from one of two places: the label the brand filed with the NIH Dietary Supplement Label Database, matched by barcode, or text read by software from a photograph of the label. Reading a photograph can go wrong, so check a number that matters on the bottle itself.
A price is a range around one recorded price, not a live price.
Money
We do not sell supplements, and our pages carry no affiliate links: we earn nothing when you buy a product.
Reporting a mistake
On a product page, the bug icon next to a line of the Supplement Facts panel or next to the product's name reports that line. For anything else, write to support@supp.fit.