Methodology Changelog

Tracks every change to our review criteria.

When we change what disqualifies a product or how we verify recommendations, the change gets logged here with the date and the reasoning. If you cited an earlier version of our methodology, this page tells you what's different in the current version and why.

v1.0 · April 26, 2026

Initial public methodology page.

Changes

  • Published the five disqualifiers that keep a product out of our top picks: a chemical of concern at meaningful exposure levels, the brand refusing to disclose composition, failing the minimum quality bar (under 4.1 stars or under 50 Amazon reviews), brand exit or relaunch as a smaller entity, and a documented pattern of misrepresenting safety or certification claims.
  • Published the verification we run before adding any product to top picks: the Amazon listing must show an Add to Cart button (not a 'See options' disambiguation), the affiliate link must return a 200 status code, any cited certification (NSF, GOTS, OEKO-TEX, MADE SAFE, CertiPUR-US, EPA Safer Choice) must appear in the certifying body's public database, and the published price range must reflect prices observed at two or more sellers within the last 30 days.
  • Added per-category disqualifiers: no PTFE or PFOA-derived nonstick coatings for cookware; NSF/ANSI 53 (lead), P473/P231 (PFAS), or 42 (chlorine) certification required for any water-filter health claim; no brominated flame retardants on polyurethane foam in mattresses; EPA Safer Choice or full ingredient disclosure for cleaning products; no synthetic fragrance, formaldehyde-releasing preservatives, parabens, or phthalates in personal care; under 50 g/L VOC for interior paint.
  • Published the first five empty-category entries (categories where we evaluated the market and nothing met the bar): synthetic plug-in and spray air fresheners, fragranced dryer sheets, PVC vinyl shower curtains, conventional aerosol bug sprays, and conventional fragranced laundry detergents. Each entry names the disqualifier and recommends an alternative.

Why

Methodology was previously implicit in individual articles. Centralizing it on a public, version-stamped page makes the process auditable, gives readers a single document to apply to products we haven't reviewed, and creates a stable URL that the editorial-policy page can point at when it makes the criteria promise.

The information on NonToxicLab is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare provider for personal health decisions.