Editorial Policy
Understand how this directory is prepared and used.
Source-first editing
We use primary research for scientific statements and current provider material for commercial details. Each profile lists sources with titles, publishers, URLs and access dates. Missing information is shown as “Not publicly disclosed” only when non-disclosure is established, or “Not independently verified” when our review is incomplete.
Assessment and publication
Editors check the exact assay, algorithm version, sample, study population, outcome and possible conflicts before publishing a profile. Unknown fields stay visible. A source-check date does not certify every aspect of a product.
Content is drafted with AI assistance and requires independent editorial review before public launch. An editor must approve scientific grades and record the verification date. We do not invent authors, expert reviewers, testimonials, review scores or usage counts.
Corrections and commercial independence
Prices and product terms can change after review. Readers should confirm final terms with the provider. Affiliate compensation must never determine evidence grades, inclusion or the finder’s scoring. Corrections should update the affected claim, sources and date together.
How we assess the evidence
The grade applies to a named measurement method and the evidence actually reviewed. It does not mean a product improves health, and it is never a score for a provider.
- A
- Replicated association with meaningful health outcomes across independent cohorts
- B
- Peer-reviewed validation but limited independent replication
- C
- Correlation with chronological age or limited outcome validation
- D
- Proprietary method with insufficient public validation
- Unrated
- Insufficient information for an assessment
Each assessment includes a plain-language rationale and source links on the relevant method or test page. Initial grades are provisional. A commercial bundle does not inherit the strongest grade of one included algorithm.
Last updated: 6 September 2026