Do you conduct your own lab testing?

We utilize a hybrid model: we commission independent lab tests for key categories and conduct rigorous "audit-level" reviews of manufacturer-provided ISO 17025 data. For many products, we audit the "Performance Data Sheet" (PDS) to ensure the testing matches real-world contaminant challenges.

What happens if a product fails a test?

Failing products are either excluded from our recommendations or listed with a "Scientific Warning," detailing specifically where the performance gap exists. We prioritze warning our community over maintaining brand relationships.

Our Methodology/

How we gather evidence

We don't just read the marketing copy. Before we score anything, we dig into the data — and here's exactly where that data comes from.

Updated: 2026-02-06

The short version

We analyze real user reviews from verified purchasers, verify official specifications from manufacturers, check safety databases like CPSC and Prop 65, and validate third-party certifications like NSF and OEKO-TEX. No score gets published until it meets our quality standards.

Where our data comes from

We gather evidence from multiple independent sources, then verify and cross-reference before any score is published. If we can't find solid evidence, we don't guess — we flag it.

Gather

Verify

Score

Publish

Real User Reviews

Verified feedback from actual product owners

Amazon verified purchasesReddit discussionsVideo reviews

Official Specifications

Manufacturer data and product documentation

Product manualsSpec sheetsMaterial disclosures

Safety Databases

Government and regulatory safety records

CPSC recallsProp 65 dataPFAS disclosures

Certifications

Third-party testing and verification

NSF certifiedOEKO-TEXGREENGUARD

Our quality standards

Multiple sources — every claim verified across sources

Evidence required — no score without supporting data

Confidence rated — we flag when evidence is limited

Regularly updated — scores refresh as new data emerges

Our process

Gather

We collect evidence from multiple independent sources — never relying on a single input. For most products, that means 100+ data points.

Verify

We cross-reference claims against specs, certifications, and safety records. If something doesn't add up, we dig deeper.

Score

We apply our methodology to calculate scores, with full transparency on the evidence. Every number is traceable.

What we look for

Consistency across sources. If reviews say one thing and specs say another, that's a red flag. We investigate before scoring.

Verified certifications. "Certified" means nothing without the actual certification. We check for NSF, OEKO-TEX, GREENGUARD, and other third-party standards — not just marketing language.

Safety records. We check CPSC for recalls, Prop 65 for warnings, and manufacturer disclosures for materials like PFAS.

Common questions

Do you test products in a lab?

For most products, we rely on verified third-party testing and certifications from accredited labs like NSF International and SGS. We don't run our own lab — but we validate that real labs have done the work properly and that certifications are current.

What if a product has limited reviews?

We flag it. Products with limited evidence get a lower confidence rating, and we're transparent about gaps in the data. You'll see this on the product page.

How often do you update scores?

Continuously. Safety data is monitored weekly, reviews are refreshed monthly, and scores update when significant new evidence emerges — like a recall or a reformulation.

Have a product you want us to check?

Search our database or scan a label to see the evidence breakdown.

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Our process

Gather

We collect evidence from multiple independent sources — never relying on a single input. For most products, that means 100+ data points.

Verify

We cross-reference claims against specs, certifications, and safety records. If something doesn't add up, we dig deeper.

Score

We apply our methodology to calculate scores, with full transparency on the evidence. Every number is traceable.

What we look for

Consistency across sources. If reviews say one thing and specs say another, that's a red flag. We investigate before scoring.

Verified certifications. "Certified" means nothing without the actual certification. We check for NSF, OEKO-TEX, GREENGUARD, and other third-party standards — not just marketing language.

Safety records. We check CPSC for recalls, Prop 65 for warnings, and manufacturer disclosures for materials like PFAS.

Common questions

Do you test products in a lab?

What if a product has limited reviews?

We flag it. Products with limited evidence get a lower confidence rating, and we're transparent about gaps in the data. You'll see this on the product page.

How often do you update scores?

Continuously. Safety data is monitored weekly, reviews are refreshed monthly, and scores update when significant new evidence emerges — like a recall or a reformulation.