Kristin Ess The One Signature Shampoo
Lower PFAS risk for a rinse-off liquid, no waterproofing or stain-resist claims.
This rinse-off liquid has no publicly disclosed waterproofing, stain resistance, or nonstick coatings where PFAS typically drives use. Standard aqueous shampoo formulations carry lower contamination risk than water-resistant cosmetics.
We flunk more products than we pass. This one earned its grade. How we grade
Material
aqueous shampoo liquid, standard emulsifiers and surfactants
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
Category baseline
cosmetics is a category where PFAS exposure is more common.
1,4-dioxane (residual solvent)
Standard shampoo surfactant manufacturing may leave trace 1,4-dioxane as a contaminant. FDA does not require labeling or removal below certain thresholds. No specific testing of this product has been published; level reflects industry-wide risk for non-certified formulations.
Fragrance allergens and unlisted components
Shampoo lists fragrance as a catch-all ingredient without disclosing specific fragrance chemicals. Individuals with sensitive scalps or known fragrance sensitivities may experience contact dermatitis. This is common across mainstream shampoos and not unique to Kristin Ess.
Formaldehyde / VOCs
Preservative systems in rinse-off shampoos may include formaldehyde-releasing compounds (e.g., DMDM hydantoin, diazolidinyl urea). Exposure is brief and dermal, not ingested. No specific preservative analysis of this product is publicly available.
Source: ATSDR ↗Allergic contact dermatitis from surfactants
Anionic surfactants in shampoos can trigger scalp irritation or contact dermatitis in sensitive individuals, independent of other hazards. This is product-class risk, not brand-specific, and is reversible upon discontinuation.
What’s reassuring
Safe base material
Made from ceramic, mineral, or natural fiber with no PFAS risk.
Heavy metals
No recalls, regulatory actions, or independent testing have identified heavy-metal contamination in Kristin Ess shampoos. Standard rinse-off formulations carry minimal heavy-metal risk unless marketed with mineral claims (not the case here).
Source: FDA ↗The full breakdown
What it's made of and why it matters
Kristin Ess The One Signature Shampoo is an aqueous liquid formulation containing standard anionic and amphoteric surfactants, emulsifiers, and conditioning agents typical of mainstream shampoos. The product is designed to be rinsed away completely after brief contact with hair and scalp, which drastically reduces exposure time and absorption risk for any chemical constituents. No unusual or high-risk raw materials have been publicly documented in this formulation.
The brand's record and disclosure
Kristin Ess (owned by Unilever) does not maintain a public-facing chemical disclosure database or third-party safety certifications (e.g., EWG Verified, Leaping Bunny) for this product line. The brand has not issued recalls or faced established safety controversies tied to this shampoo. Ingredient lists are available on retailer sites but the company does not voluntarily highlight sourcing, allergen screening, or formulation philosophy beyond marketing claims.
How it compares in its category
This product sits in the mainstream, mass-market shampoo tier. It offers no premium safety positioning (organic, hypoallergenic certification, heavy-metal testing) compared to rivals like Pantene or Garnier, but also no red-flag ingredients or manufacturing issues on record. Rinse-off cosmetics as a class carry lower systemic risk than leave-on products because exposure is brief and dermal absorption is minimal.
If you buy it
Use as directed: apply to wet hair, lather, rinse thoroughly with clean water. No special storage precautions are needed beyond keeping the bottle capped and away from extreme heat. If scalp irritation, itching, or rash develops, discontinue and consult a dermatologist; discontinuation is straightforward since there is no buildup risk with rinse-off products. No replacement trigger or maintenance schedule applies.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Kristin Ess has made none
Formulations change between production runs, so check the current label. How we grade.
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Credo Beauty
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Fragrance allergens or undisclosed fragrance components
Limited concern
Mechanical irritation from crystal size and shape
Moderate concern
Low risk, salt scrub formulation carries minimal PFAS concern.
✓Verified PFAS-free by a third party
Puracy
Public Goods Shampoo Refill
aqueous surfactant-based liquid shampoo
1,4-dioxane (surfactant byproduct)
Limited concern
Fragrance allergens (undisclosed components)
Limited concern
Bacterial or mold growth in refill container
Limited concern
Lower concern for a MADE SAFE certified shampoo avoiding fluorinated ingredients.
✓Verified PFAS-free by a third party
Puracy
Natural Shampoo
aqueous surfactants, plant-derived cleansers
1,4-dioxane (contaminant in ethoxylated surfactants)
Limited concern
Fragrance allergens and sensitizers
Limited concern
Formaldehyde / VOCs
Limited concern
Lower concern for a liquid shampoo with minimal PFAS risk in this category.
⚠Risky category by default
More shampoo 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.