Kosas · Deodorant
Дезодорант Chemistry Aha
Lower concern; typical deodorant without known PFAS drivers, but brand offers no transparency.
Kosas Chemistry Aha is a standard liquid or cream deodorant without advertised water-resistant or non-stick coatings that typically trigger PFAS use. No public PFAS claims or third-party testing are available.
Shop Kosas on Amazon →Material
Standard cosmetic formulation (deodorant base)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
cosmetics 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
Chemistry Aha is a standard stick deodorant using a cosmetic base of waxes, oils, and mineral or synthetic powders typical of mass-market deodorants. The 'Aha' designation likely refers to alpha-hydroxy acids or similar actives for odor control rather than antiperspirant aluminum. This formulation avoids aluminum chlorohydrate (the antiperspirant compound) but still relies on absorbent carriers and fragrance systems common across the category. No unusual chemical profile for a non-antiperspirant deodorant has been established in available records.
The brand's record and disclosure
Kosas is a smaller, direct-to-consumer beauty brand with minimal public disclosure on ingredient sourcing, manufacturing standards, or third-party testing for cosmetics. No major recalls, safety controversies, or certifications (organic, cruelty-free labels) are documented in established safety databases for this product line. The brand does not prominently advertise PFAS-free status or heavy-metal testing transparency, which is standard silence rather than a red flag in the deodorant category. Limited brand history makes independent verification of manufacturing controls difficult.
How it compares in its category
Non-antiperspirant deodorants like this avoid aluminum-based compounds entirely, placing it in a lower-risk subcategory than aluminum-based alternatives. However, it offers no documented advantage over comparable natural or certified clean-beauty deodorants in terms of contaminant screening. Most deodorants in this format carry similar hazard profiles around fragrance allergens and trace heavy metals in mineral fillers. Without third-party certification or brand transparency, it is functionally equivalent to dozens of unverified competitors at similar price points.
If you buy it
Use as directed on clean, dry skin; avoid application immediately after shaving to reduce irritation from potential fragrance actives. Store in a cool, dry place away from direct heat, as wax-based sticks can soften or separate if exposed to high temperatures. Replace when depleted or if discoloration or separation appears, which may indicate degradation of the base. Discontinue use if skin irritation, rash, or allergic reaction develops, and patch-test on a small area first if you have sensitive skin or known fragrance allergies.
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.”
Fragrance allergens and skin sensitization
Deodorants typically contain fragrance blends (parfum) that may include undisclosed allergens. No specific fragrance composition for Chemistry Aha is publicly available, so individual sensitivity risk cannot be quantified; users with fragrance sensitivity should request the full INCI list.
Heavy metals in mineral fillers (talc, mica, iron oxides)
Standard deodorants often use mineral powders that may carry trace lead, cadmium, or arsenic. No recalls or test results specific to this product exist; risk is typical for unverified mineral-based cosmetics without heavy-metal screening claims.
1,4-dioxane as fragrance contaminant
Deodorants with fragrance systems may inadvertently contain 1,4-dioxane, a synthetic byproduct of cosmetic ingredient processing. Kosas does not disclose whether suppliers conduct 1,4-dioxane testing, so this risk cannot be ruled out in this product line.
Formaldehyde releasers in preservative systems
Non-antiperspirant deodorants are lower-risk for broad-spectrum preservative systems, but formaldehyde-releaser compounds (e.g., imidazolidinyl urea) may be present. No ingredient list or preservation system for Chemistry Aha is publicly detailed.
Skin irritation from exfoliating acids (if AHA content is high)
The 'Aha' branding suggests alpha-hydroxy acid inclusion for odor or skin benefits. High-strength AHAs in underarm applications can cause irritation, sensitization, or dermatitis, especially with frequent use or on compromised skin.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 62% 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 Deodorant
Tom's of Maine
Deodorant
mineral-based, baking soda formulation
Lower concern, mineral-based formula with public PFAS-free positioning, though no independent third-party verification.
⚠Risky category by default
Tom's of Maine
Most-Loved Deodorant Bundle
mineral-based and plant-derived actives; stick formulation
Lower-concern deodorant; mineral-based formula with PFAS-free claim aligns with brand ethos, but no third-party verification found.
⚠Risky category by default
Tom's of Maine
Antiperspirant Deodorant
mineral-based active ingredients, plant-derived botanicals, no synthetic water-repellent coatings
Lower PFAS concern, mineral-based formula with MADE SAFE cert; antiperspirant category has minimal waterproof-coating risk.
✓Verified PFAS-free by a third party
More deodorant 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.