Kosas Chemistry AHA Serum Deodorant
Lower concern. Liquid cosmetic with no known PFAS indicators.
AHA serums are water-based cosmetics with no typical PFAS drivers like waterproofing or water-repellent coating coatings. Kosas does not market PFAS-free claims, but the product category carries minimal PFAS risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
water-based serum with AHA active ingredients
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Kosas Chemistry AHA Serum Deodorant is made of, ingredients and materials
Kosas Chemistry AHA Serum Deodorant is a liquid, water-based formulation containing alpha hydroxy acids (AHA) as active ingredients. The serum base means it relies on humectants and hydrating agents rather than talc or mineral powders, which avoids inhalation and particulate concerns associated with powder deodorants. AHA ingredients (typically glycolic or lactic acid) are keratolytic agents used to reduce odor-causing bacteria and improve skin texture; they require pH balance and are not themselves known toxicants at cosmetic concentrations.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
1,4-dioxane contamination
Water-based emulsified cosmetics can harbor trace 1,4-dioxane as a byproduct of certain surfactants and preservatives. No testing data is published; this is a potential concern class for liquid serums, not confirmed for this product.
Fragrance allergens or undisclosed fragrance components
Kosas Chemistry line uses fragrance and essential oils; specific allergen testing and fragrance chemical breakdowns are not publicly disclosed. Contact allergens (e.g., limonene, citral) may be present if botanical extracts are included.
Skin irritation from AHA concentration
AHA at high concentrations (above 10%) can cause burning, redness, and barrier damage, especially on sensitive skin. Product concentration is not publicly stated; misuse on damaged skin or daily application without sunscreen can increase risk.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
No formaldehyde-releasing preservatives are listed in publicly available ingredient disclosures for this serum. Standard cosmetic preservatives (e.g., phenoxyethanol, sodium benzoate) are presumed but not confirmed by brand.
Source, ATSDR ↗Heavy metals
Deodorant serums typically contain no iron oxides or synthetic pigments; this product is unlikely to be a source of lead, cadmium, or chromium.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Kosas (Estee Lauder subsidiary) does not publicly disclose PFAS stance or third-party testing results for this product line. The brand maintains general clean-beauty marketing but has not published ingredient safety data sheets or third-party certifications (e.g., EWG Verified, Leaping Bunny) specific to this serum. No established recalls or safety controversies are on record for this product.
How it compares in its category
Water-based AHA deodorants are less common than antiperspirant-deodorant hybrids or powder forms. Versus aluminum-salt antiperspirants, this product avoids sweat-blocking actives and aluminum exposure. Versus talc or mineral powders, it avoids inhalation and particulate hazards. The trade-off is typically lower sweat absorption and shorter duration; it positions as a gentler, exfoliating alternative for sensitive or irritation-prone skin.
If you buy it
Apply to clean, dry underarm skin; do not use on broken skin, as AHA can sting. Avoid contact with eyes and mucous membranes. Store below room temperature (heat stability of liquid serums is not specified by brand; refrigeration is optional but may extend shelf life). Discontinue if redness, burning, or allergic reaction occurs within 48 hours. Replace after 12 months or if separation or odor change is visible.
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Kosas has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Kosas Chemistry AHA Serum Deodorant?
- mineral-based powder blend (arrowroot, magnesium hydroxide, mica)
- We found no PFAS statement from the brand
- Skin irritation from magnesium hydroxide alkalinity
- cosmetic formulations, primary ingredients listed
- A third party reports verifying it as PFAS-free
- Fragrance allergens (natural essential oils)
2 hazards checked on this product, all on its full breakdown.
- natural mineral powders, plant-based actives, beeswax
- We found no PFAS statement from the brand
- Beeswax purity and contamination
2 hazards checked on this product, all on its full breakdown.
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.