Does Dear Kate period underwear have PFAS?
Dear Kate period underwear averages 48 out of 100 on PFAS Authority's PFAS and toxin screen across the 4 Dear Kate period underwear products graded as of October 2026, level with the 48 out of 100 median for the 21 other period underwear brands graded alongside it.
Dear Kate period underwear averages Poor on our four-band scale. 2 of the 4 we graded are worth buying. That is above 62% of the period underwear brands we grade.
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
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- 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
Vegan Mattress
- 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.
Dear Kate period underwear worth buying Good or better, best-graded first
- Organic cotton with synthetic elastic
- We found no PFAS statement from the brand
- Heavy metals. No dye sourcing or testing information is published by Dear Kate. Organic cotton typically uses…
3 hazards checked on this product, all on its full breakdown.
- Organic cotton blend, absorbent core
- We found no PFAS statement from the brand
- Formaldehyde / VOCs. If the absorbent core uses antimicrobial or moisture-wicking finishes…
2 hazards checked on this product, all on its full breakdown.
Which Dear Kate period underwear contains PFAS? Poor and Bad, we’d swap these
- Organic cotton with waterproof/absorbent backing, unspecified treatment
- We found no PFAS statement from the brand
- Teflon-type coating/Teflon-family coating fume risk (from waterproof backing). If the backing uses…
3 hazards checked on this product, all on its full breakdown.
Find an alternative on Amazon
- Nylon/spandex blend with waterproof treatment (unspecified)
- We found no PFAS statement from the brand
- PFAS. Waterproof treatment composition is undisclosed. Most nylon period panties use either Teflon-type…
4 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonBetter period underwear from other brands
Graded higher than the Dear Kate average of 48.
- organic cotton, waterproof backing layer
- A third party reports verifying it as PFAS-free
- Coating degradation and microparticle shedding
2 hazards checked on this product, all on its full breakdown.
- organic cotton blend, water-resistant gusset
- The brand calls it PFAS-free, which we have not verified
- Microplastic shedding from water-resistant barrier
- Organic cotton, wood pulp fiber
- The brand calls it PFAS-free, which we have not verified
- Azo dyes and synthetic dyes
2 hazards checked on this product, all on its full breakdown.
The same question, asked of the other period underwear brands
Best average grade first. Dear Kate averages 48.
See every Dear Kate product we grade on the Dear Kate brand page, or the full period underwear ranking.