Chronologiste Bain Régénérant Shampoo
Low-medium concern; shampoo formulations rarely need PFAS without public disclosure.
This rinse-off liquid shampoo lacks Teflon-family coating coatings or waterproofing treatments that typically require PFAS chemistry. Kerastase makes no public PFAS claims or certifications, and no regulatory flags exist, though shopper confidence relies on absence of evidence rather than brand transparency.
We flunk more products than we pass. This one earned its grade. How we grade
Material
aqueous surfactants, conditioning agents, preservatives, typical liquid shampoo formulation
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.
Preservative allergens (contact sensitization)
Aqueous shampoos require broad-spectrum preservatives (typically methylisothiazolinone, phenoxyethanol, or sodium benzoate at 0.5-1.5% w/w). Kerastase does not disclose specific preservative identity; individuals with fragrance or biocide sensitivities report occasional scalp irritation with premium formulations in this tier.
Fragrance undisclosed components (respiratory/skin sensitization)
This product contains fragrance compounds listed only as 'parfum' on labels; EU regulations permit up to 4,200+ fragrance chemicals without item-level disclosure. Limonene and other volatile allergens in botanical-scent formulations can trigger contact dermatitis or inhalation sensitivity in 1-3% of users, especially if used daily.
Microplastics
Liquid shampoos rarely contain intentional microbeads, but conditioning polymers (acrylates, polyquaternium, PEG derivatives) function as film-formers and are not biodegradable. Environmental impact is documented; dermal absorption is negligible in rinse-off products, but these are water-column contaminants post-disposal.
Source: EPA ↗What’s reassuring
Safe base material
Made from ceramic, mineral, or natural fiber with no PFAS risk.
1,4-dioxane (preservative byproduct contamination)
Liquid shampoos made with ethoxylated surfactants may contain trace 1,4-dioxane (typically <1 ppm) as a processing byproduct. No documented testing of Chronologiste specifically; EU manufacturing standards limit this to non-detectable levels, but Kerastase has not published compliance data.
Heavy metals
Clear to translucent shampoos carry minimal risk of lead or cadmium from synthetic pigments. Conditioning polymers and botanical extracts (if present) are not known to bioaccumulate metals at consumer-use levels, though batch variability in natural ingredient sourcing is not tracked by Kerastase publicly.
Source: FDA ↗The full breakdown
What it's made of and why it matters
Chronologiste Bain Régénérant is an aqueous liquid shampoo formulation containing anionic surfactants (cleansing), conditioning polymers, humectants, and preservatives typical of premium hair care. The aqueous base minimizes volatility and dermal penetration risk versus powder or aerosol formats. No silicone oils or heavy metallic pigments are standard in this product line, reducing heavy metal exposure during wash and rinse.
The brand's record and disclosure
Kerastase (L'Oréal-owned) has not published ingredient-level PFAS testing or voluntary restricted substance disclosure statements as of public record. The brand meets EU and North American cosmetic regulations (CLP/FD&C Act) for preservatives and contaminants but does not proactively disclose preservative chemistry or heavy metal testing limits. No major recalls or safety controversies involving this specific product line are documented.
How it compares in its category
Salon-grade shampoos like this sit mid-to-high on pricing and formulation complexity; they typically carry lower microplastic risk than color-correcting or exfoliating shampoos. Compared to budget drugstore alternatives, Kerastase invests in conditioning agents and rheology control, which may reduce irritation but do not eliminate preservative or fragrance allergen exposure. Performance-focused formulations (anti-aging, reparative) often use higher polymer loads, which is standard here.
If you buy it
Apply 1-2 pumps to wet hair, lather, and rinse thoroughly with cool water to reduce cuticle swelling and fragrance residue. Store in a cool, dry place away from direct sunlight to preserve preservative efficacy and prevent microbial contamination. Do not ingest; keep away from eyes. Replace when formula separates, develops odor, or after 12 months of opening to minimize preservative degradation and bacterial growth.
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
- Kerastase has made none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Shampoo
Credo Beauty
Roz Salt Scalp Scrub
salt crystals, mineral-based scrub
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.