Proof Review, Is Proof Non-Toxic?
Proof averages 25 out of 100 on PFAS Authority's PFAS and toxin screen across the 2 Proof products graded as of October 2026, and none of them reach its 70 point pass mark.
Proof grades Poor on our four-band scale. On disclosure, the brand says nothing publicly about PFAS. See what every brand has published about PFAS for how that compares.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
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Top-graded picks in the categories readers replace first, every one scored on the same rubric.
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product, all on its full breakdown.
Aquasure
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- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product, all on its full breakdown.
Avocado
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- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
- Heavy metals
2 hazards checked on this product, all on its full breakdown.
Which Proof products contain PFAS? Poor and Bad, we’d swap these
- organic cotton with waterproof coating (unspecified)
- We found no PFAS statement from the brand
- Unspecified waterproof coating chemistry. Proof has not disclosed whether the waterproof layer uses PFAS…
3 hazards checked on this product, all on its full breakdown.
Find an alternative on Amazon
- Gusseted cotton-blend fabric with water-resistant coating
- We found no PFAS statement from the brand
- Coating degradation and particle shedding, water-repellent coating coatings on textiles naturally degrade…
5 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonProof and PFAS, common questions
- Does Proof have PFAS?
- Proof averages 25 out of 100 on PFAS Authority's PFAS and toxin screen across the 2 Proof products graded as of October 2026, and none of them reach its 70 point pass mark. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests.
- Is Proof non-toxic?
- No Proof product we graded reaches Good. The best of them is Saalt Leakproof Period Cotton Brief, Heavy / S / Pink Dawn at 25/100.
- Which Proof products should I avoid?
- The lowest-graded Proof products we have scored are Thinx Teens Bikini Leakproof Period Underwear - Black, Saalt Leakproof Period Cotton Brief, Heavy / S / Pink Dawn. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →