Do Flex menstrual cups have PFAS?
Flex menstrual cups average 70 out of 100 on PFAS Authority's PFAS and toxin screen across the 7 Flex menstrual cups graded as of October 2026, and all 7 reach its 70 point pass mark.
Flex menstrual cups average Good on our four-band scale. 7 of the 7 we graded are worth buying.
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.
Flex menstrual cups worth buying Good or better, best-graded first
- Medical-grade silicone
- We found no PFAS statement from the brand
- Bacterial or mold colonization from poor maintenance. Any menstrual cup can harbor bacteria or fungal growth…
2 hazards checked on this product, all on its full breakdown.
- Medical-grade silicone, no added Teflon-family coating
- We found no PFAS statement from the brand
- Residual manufacturing compounds / silicone impurities. Medical-grade silicone undergoes purification, but…
2 hazards checked on this product, all on its full breakdown.
- Medical-grade silicone
- We found no PFAS statement from the brand
- Bacterial or fungal colonization. Any reusable menstrual cup can harbor bacteria or fungi if inadequately…
2 hazards checked on this product, all on its full breakdown.
- Medical-grade silicone
- We found no PFAS statement from the brand
- Silicone degradation and particle shedding. Medical-grade silicone can degrade if exposed to very high heat…
2 hazards checked on this product, all on its full breakdown.
- Medical-grade silicone
- We found no PFAS statement from the brand
- Silicone degradation and particulate shedding. Medical-grade silicone is stable under normal use, but…
4 hazards checked on this product, all on its full breakdown.
- medical-grade silicone
- We found no PFAS statement from the brand
- Bacterial or fungal contamination. While silicone itself resists microbial biofilm better than latex…
3 hazards checked on this product, all on its full breakdown.
- Medical-grade silicone (body-contact surface)
- We found no PFAS statement from the brand
- Bacterial or fungal biofilm growth on cup surface. If cups are stored wet or in airtight containers, or not…
3 hazards checked on this product, all on its full breakdown.
Better menstrual cups from other brands
Graded higher than the Flex average of 70.
- medical-grade silicone
- A third party reports verifying it as PFAS-free
- Silicone degradation or leaching from improper cleaning agents
3 hazards checked on this product, all on its full breakdown.
See every Flex product we grade on the Flex brand page, or the full menstrual cups ranking.