Sustain · Tampons
Tampons
Lower PFAS concern for core materials, but brand discloses nothing about applicators or processing.
Sustain tampons use organic cotton and rayon as primary materials, inherently lower-risk fibers unlikely to contain PFAS. The brand holds MADE SAFE certification, which screens for harmful chemicals.
Material
organic cotton, rayon (viscose)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
Sustain tampons use organic cotton and rayon (viscose) as the absorbent core. Organic cotton eliminates synthetic pesticide residues common in conventional cotton; rayon is a cellulose fiber derived from wood pulp that absorbs menstrual fluid efficiently. Neither material is known to leach heavy metals, BPA, or phthalates into the body. The absorbent structure itself does not typically shed microplastics, though applicators (plastic or cardboard) and any synthetic wrapping present separate concerns.
The brand's record and disclosure
Sustain publishes certification claims around organic cotton and sustainability but does not disclose detailed ingredient sourcing, applicator material specifications, or manufacturing process testing for contaminants. No major recalls or safety violations are on public record for this brand. The silence on processing (e.g., bleaching, rayon production controls) and applicator composition is a meaningful gap, as these steps can introduce or concentrate low-level contaminants; however, absence of disclosure is not evidence of hazard.
How it compares in its category
Sustain's organic cotton core places it above conventional tampon brands (which may carry pesticide residues and synthetic dyes) but comparable to other certified-organic alternatives like Seventh Generation or Cora. Most mainstream brands use conventional cotton and chlorine bleaching; Sustain avoids both. Rayon viscose is standard across nearly all brands and carries no established safety advantage or disadvantage versus alternatives in menstrual products, though rayon production is a heavy water and chemical user at the mill level.
If you buy it
Tampons are single-use products with no maintenance. Ensure applicator type matches your preference (plastic or cardboard) and dispose according to local guidelines; do not flush unless explicitly labeled flushable. Change tampons every 4 to 8 hours to reduce toxic shock syndrome risk, a rare but serious condition independent of brand. Organic cotton does not eliminate TSS risk; regular changeout and hygiene are the key controls.
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.”
Formaldehyde resins (processing/preservatives)
No formaldehyde-donor preservatives or cross-linking resins are documented in organic cotton or rayon tampons. Conventional cotton tampons may retain traces from pesticide or textile processing, but Sustain's organic claims suggest avoidance of this pathway. No reported cases of formaldehyde irritation from Sustain tampons.
Chlorine bleaching residues and dioxins
Sustain does not disclose bleaching method (elemental chlorine, ECF, or TCF). Even low-level dioxin formation from bleaching is theoretically possible in rayon production. Direct mucosal absorption of trace dioxins from tampons is not established as a health route, but brand transparency on bleaching would clarify risk. FDA does not mandate bleaching disclosure for tampons.
Applicator material leachables (plastic or cardboard)
Sustain does not specify applicator composition. Plastic applicators may contain BPA or phthalates depending on resin type and age; cardboard applicators avoid this but are not universally preferred. Mucosal contact is brief and applicator does not enter the body, limiting direct absorption, but material choice matters for environmental and contact dermatitis risk.
Rayon viscose process chemicals (absorbed into fiber)
Rayon viscose production uses sodium hydroxide and sodium sulfide; these are fully recovered in closed-loop processes at compliant mills but can leave trace sodium or sulfur compounds if mills are poorly managed. Sustain does not disclose mill certifications. No documented health effects from tampons made with standard viscose rayon.
Toxic shock syndrome (TSS) from product design and use
TSS risk is independent of organic vs. conventional material and depends on absorbency, changeout frequency, and user hygiene. Sustain does not claim reduced TSS risk. All tampons carry a small absolute risk; material composition does not alter this. FDA warnings apply equally to all brands.
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
Organic Cotton Tampons Applicator
organic cotton (tampon & applicator core); cardboard applicator
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
Organic Cotton Tampons
organic cotton (no synthetic coatings)
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
organic cotton tampon with cardboard/plastic applicator
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.