Flux Undies averages 50 out of 100 on PFAS Authority's PFAS and toxin screen across the single Flux Undies product graded as of October 2026, which does not reach its 70 point pass mark.
Free to quote with attribution to PFAS Authority and a link to pfasauthority.com/brands/flux-undies.
Flux Undies grades Good on our four-band scale. On disclosure, the brand claims its products are PFAS-free (self-declared). 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.
Graded and flagged Poor and Bad, we’d swap these
Flux Undies
FLUX Cheeky Light reusable Period Panties
50GoodPFAS grade
✓ OEKO-TEX
✓organic cotton blend with water-resistant coating
✓The brand calls it PFAS-free, which we have not verified
⚠Water-resistant coating chemistry (unstated), The brand claims PFAS-free treatment but has not disclosed the…
Flux Undies averages 50 out of 100 on PFAS Authority's PFAS and toxin screen across the single Flux Undies product graded as of October 2026, which does not reach its 70 point pass mark. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests.
Is Flux Undies non-toxic?
No Flux Undies product we graded reaches Good. The best of them is FLUX Cheeky Light reusable Period Panties at 50/100.
Which Flux Undies products should I avoid?
The lowest-graded Flux Undies products we have scored are FLUX Cheeky Light reusable Period Panties. Each one links to the evidence behind its grade.
