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b12guide.com

How we research, check, and correct our pages

Last updated

This policy sets the rules every page on b12guide.com follows, from the first draft to later corrections. b12guide.com is written by our editorial team. We do not publish the names of individual team members.

Sources we rely on

For medical facts we use primary and official sources, in this order of preference:

  1. Fact sheets from the NIH Office of Dietary Supplements (NIH ODS)
  2. Health pages from the NHS
  3. MedlinePlus, from the U.S. National Library of Medicine
  4. Original research and systematic reviews indexed in PubMed
  5. Guidelines from professional medical societies

We also use patient pages from major academic medical centers and laboratory-testing guides for plain-language explanations, and we check them against the sources above. For product facts such as price, collection method, and turnaround time, we use the seller’s own product page.

Health news sites, blogs, and other third-party health media can point us to a question, but we never cite them as evidence. We do not use forums, social media, or marketing copy as a source for any health claim.

How we cite

Every specific number, dose, and lab range carries a visible numbered citation. The number links to the source list at the bottom of the page, where each entry gives the title, publisher, a link, and the date we last checked it. Tables show their sources and check dates directly underneath.

When two sources disagree, as they do on whether to fast before a B12 test, we show both and explain the difference. If we cannot trace a number to a source, we do not publish it. Citations sit next to the claim they support, not at the end of a paragraph, so you can see exactly which source backs each statement.

How content is written and reviewed

Each page goes through four steps:

  1. Write. We draft each page around the questions people actually ask, with the direct answer first.
  2. Check every number. Every specific number, dose, and lab range is checked by a person against a cited primary source before it is published. A claim that does not match its source is fixed or removed.
  3. Editorial review. The page is read again for accuracy, plain language, and anything that could read as personal medical advice.
  4. Publish. The page goes live with its sources and a “Last updated” date.

Medical review. Content is written by our editorial team and checked line by line against primary sources. We do not currently use an outside medical reviewer, and no page on this site has been reviewed by a doctor.

When the evidence on a question is unclear, we say the evidence is mixed instead of implying certainty. We do not diagnose, and we do not give personal dosing advice.

Use of AI

We use AI tools to gather sources and information and to help prepare drafts. A member of our editorial team then checks every fact, number, and source by hand against the original before anything is published. AI tools do not decide what we publish.

Whatever tools are used in drafting, the rule does not change: Every specific number, dose, and lab range is checked by a person against a cited primary source before it is published. AI tools are never the final check on a fact. We do not publish AI-generated images as medical illustrations or as photos of people.

Updates and corrections

We review every page at least once every 12 months, and sooner when a primary source we cite is updated or a reader reports a problem. We also update a page when one of its cited sources changes. Every page shows a “Last updated” date.

If you find a mistake, tell us. We check it against the source, correct the page, and note the correction on the page with the date it was made.

Advertising and independence

Our content is free to read. If we add affiliate links, the site will be funded by commissions from testing services and dietary supplements. Sellers cannot pay to be included or ranked. Affiliate income does not affect which topics we cover, how products are ranked, or what our pages conclude. Sellers and affiliate programs have no part in editorial decisions, and they do not see pages before they are published. We do not run display advertising. Our affiliate disclosure explains how affiliate links work.

To report an error, use our contact page and include the page link, what you think is wrong, and the source that supports the correction.