Aunt Flow · Tampons
Aunt Flow Tampon Cartridge
Lower PFAS concern than mainstream tampons; no red flags identified, but brand offers no transparency.
Aunt Flow tampons use traditional rayon and cotton materials without documented Teflon-family coating coatings, dyes, or water-resistant treatments, typical for period-care products. The brand makes no PFAS claims and provides limited material disclosure.
Shop Aunt Flow on Amazon →Material
rayon/viscose core, cotton cover, minimal processing
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
Aunt Flow tampons use a rayon/viscose core wrapped in cotton, avoiding the synthetic polymer blends common in conventional tampons. Rayon is a regenerated cellulose fiber derived from wood pulp; the viscose process does involve chemical solvents, but the final fiber retains no hazardous residues if manufacturing standards are met. The cotton cover adds breathability and reduces irritation risk compared to fully synthetic constructions. This material pairing minimizes synthetic chemical exposure at the point of contact with sensitive mucous tissue.
The brand's record and disclosure
Aunt Flow markets itself as a transparency-focused brand emphasizing ingredient simplicity and sustainable sourcing, though specific third-party certifications (organic, non-GMO) are not prominently documented in publicly available records. The brand does not publicly disclose PFAS testing or comprehensive chemical safety data, which is consistent with most tampon manufacturers but represents a missed opportunity for differentiation. No safety recalls or substantiated contamination incidents are on record for this brand. The silent stance on PFAS does not indicate a problem, only an absence of proactive communication on this emerging concern.
How it compares in its category
Conventional tampons (Tampax, Kotex) often blend rayon with polyester or polypropylene, which increases microplastic and synthetic chemical exposure. Aunt Flow's rayon-cotton focus aligns it with premium alternatives like Cora and Rael, which similarly emphasize plant-based materials. However, Aunt Flow lacks the organic certification or third-party testing transparency that brands like Rael or July advertise. For most users seeking a safer-than-mainstream option without premium pricing, Aunt Flow occupies a practical middle ground.
If you buy it
Store in a cool, dry location away from direct sunlight to prevent moisture absorption and microbial growth. Change every 4-8 hours depending on flow; leaving any tampon in place longer than recommended increases toxic shock syndrome (TSS) risk regardless of material. If you experience unusual itching, burning, or odor, discontinue use and consult a healthcare provider, as individual sensitivity varies. The rayon/cotton blend biodegrades faster than fully synthetic alternatives, so disposal in standard waste is acceptable in most jurisdictions.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Dioxins from viscose processing
Viscose rayon production involves chlorine-based bleaching and sodium hydroxide; trace dioxin residues are theoretically possible if manufacturing controls are lax, though regulated producers in developed countries operate under strict environmental standards. Aunt Flow does not disclose mill location or process validation.
Formaldehyde-based finishing resins
Cotton covers may receive wrinkle-resistance or antimicrobial finishing treatments containing formaldehyde releasers; Aunt Flow's 'minimal processing' claim suggests avoidance, but no explicit disclosure rules this out. Direct contact is brief and mucosal absorption risk is low compared to apparel.
Microplastic shedding from rayon fibers
Rayon is cellulose-based and biodegradable, not synthetic polymer; it does not shed microplastics. This is an advantage over tampons blended with polyester or polypropylene.
Pesticide residues in conventional cotton
If the cotton cover is not organic-certified, it may carry residual pesticides or herbicides (glyphosate, insecticides). Aunt Flow does not advertise organic certification, leaving this unresolved. Mucosal exposure during use is low-volume but direct.
Toxic shock syndrome (TSS) risk
TSS is a rare but serious bacterial infection associated with prolonged tampon use regardless of material composition. Rayon's high absorbency can encourage longer wear times, which paradoxically increases risk if users believe 'natural' materials are safer. Follows standard TSS warnings apply universally.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Tampons
Seventh Generation
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Lower-concern buy, organic cotton & MADE SAFE cert reduce PFAS risk, though brand is silent on the topic.
✓Verified PFAS-free by a third party
Lola
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Lower concern, uncoated organic cotton with transparent PFAS-free positioning and third-party certification.
✓Verified PFAS-free by a third party
Cora
Organic Tampons with Applicator
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Lower-concern choice; organic base material and MADE SAFE cert suggest thoughtful sourcing, but no explicit PFAS commitment.
✓Verified PFAS-free by a third party
More tampons grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.