Sourcing and corrections policy
The short answer: we cite the strongest available source for each statement, link it next to the sentence it supports, and list every source in full at the end of the page, with authors, journal, year, PubMed and DOI identifiers where they exist. Errors reported to support@zornava.com are checked against the source and corrected, and material corrections are noted on the page.
The order of evidence
| Rank | Source type | Used for |
|---|---|---|
| 1 | FDA prescribing information, FDA safety communications and warning letters | What a medication is approved for, how it is labelled, reported adverse reactions, warnings |
| 2 | Peer-reviewed randomized trials and their registry records | What a medication or nutrient did in people, by dose and against placebo |
| 3 | Meta-analyses, systematic evidence syntheses and professional-society guidelines | The weight of evidence across trials; clinical recommendations |
| 4 | Government nutrition references (National Academies DRIs, USDA FoodData Central, NIH Office of Dietary Supplements) | Nutrient needs and food composition |
| 5 | Manufacturer announcements and pricing pages | Results not yet peer-reviewed, regulatory plans, list prices and savings programs, always labelled as company information and dated |
| 6 | Reputable news reporting | Events not yet in any of the above, labelled as reporting |
How citations work on our pages
- A bracketed number follows the sentence it supports and links to the full reference at the end of the page.
- Each reference gives authors or organization, title, journal or publisher, year, and a link; PubMed and DOI identifiers are included where they exist.
- Where we read only the abstract of a paper, the reference says so.
- Where a source has a conflict of interest that matters, such as a trial funded by the drug's maker, the reference notes it.
- Numbers are reported as the source reports them, with the population, duration and dose they apply to. Results from separate trials are not presented as a head-to-head comparison.
Dates
Pages show a published date and a last-reviewed date. "Last reviewed" means a person re-checked the page against its sources on that date. Facts that change, such as prices, approval status and trial results, are written "as of" a date.
What we will not cite
- Sellers of unapproved, compounded-for-sale or "research use only" drugs.
- Marketing claims presented as evidence, including claims made for our own product.
- Anonymous forums, except to describe what people are asking, never as evidence.
Corrections
- Email support@zornava.com with the page address and what you believe is wrong.
- We check the claim against the cited source and any newer evidence.
- Errors of fact are corrected. If the correction changes the meaning of a statement, a dated note at the end of the page says what changed.
- If we disagree, we reply with the source we are relying on.
The rest of our standards, including who writes and checks articles and how we handle our own product, are in the editorial policy.
Last updated November 13, 2026.