Calvin Klein CK One: 14 Ingredients, 7 Declared Allergens
One of the shortest labels in the category, and it still leans on a black box.
CK One runs a notably short, clean list for a mass-market fragrance, fourteen lines, no sunscreen filters, even a skin-conditioning ester at the end. Credit where it is due. But the third line is still “Parfum,” and seven of the remaining lines are the EU-mandated allergen disclosures that come standard once a brand has to name them. A short label is better than a long one. It is not the same as a transparent one.
The label, flagged
Alcohol Denat.ACTUALLY FINE
Fearmongered as “toxic alcohol,” but at cosmetic use it is well-tolerated and evaporates within seconds. We clear it.
Water
ParfumCAUTION
Not a hazard in itself, but a legal black box. “Fragrance” can shield ingredients (including EU-banned ones) that you are never told are there.
the trade-secret black box
LinaloolCAUTION
Same story as limonene: weak on its own, a real sensitizer once oxidized. Common cause of fragrance contact allergy.
LimoneneCAUTION
Harmless fresh, but it oxidizes in air and on skin into potent contact allergens. Real, measurable sensitization; not a cancer scare.
CitronellolCAUTION
Recognized fragrance contact allergen (EU H317); cross-reacts with geraniol.
CoumarinCAUTION
A recognized fragrance allergen present in most deodorants. Sensitization is real but bounded; no credible cancer signal at cosmetic exposure.
GeraniolCAUTION
One of the most frequently reported fragrance contact allergens in EU clinics.
BHTCAUTION
A synthetic antioxidant the EU flagged for possible endocrine effects and the UK restricted in 2024, safe at low levels, watched closely abroad, unrestricted here.
CitralCAUTION
Among the most frequently reported fragrance allergens; a sensitizer, not a systemic toxin.
Tetrasodium EDTA
chelator
IsoeugenolCAUTION
The strictest-controlled of the established fragrance allergens: an EU concentration cap of 0.02%, not just a labelling rule, plus the highest patch-test positivity of the group. A strong caution.
Acrylates/Octylacrylamide Copolymer
film-former / fixative
Hydrolyzed Jojoba Esters
skin-conditioning emollient
Source: SkinSort ingredient database (team-verified). View label. Tap any flagged ingredient for the evidence.
What to use instead
The fix isn’t complicated: a fragrance-free or fully-disclosed alternative, with the ingredients flagged on this label designed out, closes these gaps at once. We pick the ones worth your money.
Shop phthalate-free fragrance →Editorial analysis of the publicly listed label and regulatory/peer-reviewed sources. Not medical advice, not affiliated with the brand. Verdicts are evidence-graded, we flag what the data flags and clear what it clears.