Sustain · Tampons
Tsuno Super Tampons
Lower PFAS concern; standard tampon with no known problematic treatments, but brand silence on materials limits certainty.
Tsuno Super Tampons appear to use conventional cotton/rayon construction without documented water-resistant or grease-resistant coatings that typically introduce PFAS. Sustain has not publicly disclosed PFAS testing or material sourcing details.
Shop Sustain on Amazon →Material
cotton/rayon absorbent core, minimal synthetic components
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
Tsuno Super Tampons use a cotton and rayon absorbent core, a conventional combination that has been the industry standard for decades. Rayon is a regenerated cellulose fiber derived from wood pulp; both materials are natural or semi-synthetic and do not inherently carry the chemical risks associated with fully synthetic polymers. The applicator and minimal plastic components are typical for this product class. This material composition avoids several hazard classes that plague some personal care items, such as microplastic shedding or persistent synthetic chemical accumulation.
The brand's record and disclosure
Sustain is known for positioning itself as an organic and eco-conscious brand, and Tsuno is marketed with organic cotton certification claims. However, the brand has not published detailed material safety data sheets or third-party testing results for heavy metals, pesticide residues, or dioxin (a known concern in conventional bleached cotton tampons). The lack of vocal transparency on PFAS treatment and full chemical disclosure limits independent verification, though the absence of reported safety incidents does not indicate absence of risk. Certifications like organic status provide some assurance but are not substitutes for full chemical transparency.
How it compares in its category
Tsuno sits in the mid-to-premium segment of tampon products, positioned above mass-market conventional brands but alongside other organic-certified options like Seventh Generation and Cora. Most mainstream tampons use similar cotton/rayon blends; the primary differentiator is the organic cotton claim, which reduces pesticide residue risk during farming but does not eliminate processing chemicals. Conventional bleaching with elemental chlorine (now banned in most Western manufacturers) has been largely replaced with oxygen-based methods, reducing dioxin risk across the category. Sustain's pricing reflects the organic premium, not necessarily a safety advantage over other modern bleached-and-dioxin-screened products.
If you buy it
Use as directed on the package without special precautions; cotton/rayon tampons have no special heat sensitivity or storage requirements beyond keeping them dry. Change tampons every 4-8 hours as standard practice to reduce bacterial overgrowth risk (toxic shock syndrome), a concern for all tampons regardless of material. If you have a history of sensitivity or irritation, note whether it correlates with this product; individual reactions to dyes or finishes vary. Monitor for any unusual vaginal irritation or systemic symptoms, though serious adverse events are rare with products meeting modern safety standards.
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.”
Dioxin and dioxin-like compounds from chlorine bleaching
Conventional cotton tampon bleaching can generate trace dioxins; modern oxygen-based bleaching reduces but may not eliminate this risk. Sustain has not published dioxin testing results for this product, so residual levels are unknown.
Pesticide residues in cotton
Although Tsuno uses organic cotton (reducing synthetic pesticide input), residues from legacy soil contamination or cross-pollination are theoretically possible. No third-party pesticide residue testing is publicly available for this specific product.
Heavy metals or impurities in rayon processing
Rayon production can involve sodium hydroxide and carbon disulfide; finished rayon is not inherently a heavy metal source. No reported contamination in Sustain products, and rayon used in tampons is generally well-controlled in Western manufacturing.
Dyes and colorants in the applicator or packaging
Tampons typically use minimal synthetic dyes in absorbent materials. Sustain does not disclose specific dye types, but reported adverse reactions are rare and not established for this brand.
Bacterial overgrowth or contamination during storage
Cotton/rayon blends are susceptible to mold or bacterial growth if stored in high humidity; standard packaging and user storage practices mitigate this. No field reports of contamination specific to Tsuno.
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.