Crème colorante permanente Color Variété Brun Noix — ingredient safety report

• Allergy risk:One of the most potent cosmetic allergens; can cause severe facial/scalp reactions; the danger in 'black henna' tattoos.
• Cancer concern:IARC Group 3 overall, but occupational data keeps it under scrutiny.

The permanent hair-dye chemical behind most serious dye reactions, and the sensitizer hidden in 'black henna' temporary tattoos. Always patch test 48h before coloring.

• Allergy risk:Fragrance is the single most common cause of cosmetic contact allergy.
• Irritation:Frequent trigger of stinging and redness on reactive skin.

An umbrella term that can hide dozens of undisclosed scent chemicals. Fragrance is the leading cause of allergic contact dermatitis from cosmetics, and dermatologists routinely advise fragrance-free products for eczema, babies and sensitive skin.

• Allergy risk:Potent sensitizer, typically blended with MIT (Kathon CG).
• Irritation:Corrosive in concentrate; irritating at use levels.

The chlorinated partner of MIT, restricted in the EU to rinse-off products only. A leading cause of preservative contact dermatitis worldwide.

• Allergy risk:Caused an epidemic of contact allergy; banned in EU leave-on products.
• Irritation:Irritating even in people without allergy.

A preservative behind one of the largest contact-allergy epidemics in cosmetic history. The EU banned it from leave-on products and restricts it in rinse-off products to 15 ppm.

• Allergy risk:Recognized contact allergen in hair dyes.
• Irritation:Irritating at therapeutic strengths.

A hair-dye coupler and old acne remedy with credible thyroid-disruption evidence, under active EU endocrine review.

• Irritation:Oxidizing irritant to skin and mucosa; EU caps tooth-whitening use at 6%.

The bleaching oxidant in hair color and tooth whitening; irritation scales with concentration and contact time.

• Allergy risk:American Contact Dermatitis Society Allergen of the Year 2018.
• Irritation:Can irritate compromised skin at higher concentrations.

A workhorse humectant and penetration enhancer that is fine for most, but a recurring culprit in eczema patients' patch tests.

• Cancer concern:IARC Group 2B (possibly carcinogenic); listed under California Prop 65.
• Allergy risk:Recognized contact allergen in rinse-off products.

A foam booster classified as possibly carcinogenic by IARC and largely phased out of reputable formulas since its 2012 Prop 65 listing.

• Allergy risk:Named Allergen of the Year 2004; impurities (amidoamine) drive most reactions.

A mild coconut-derived surfactant in countless 'gentle' cleansers. Most allergy is caused by manufacturing impurities, so quality varies by brand.

• Irritation:Occasional stinging and irritation, mostly around eyes and on damaged skin.

Today's most common preservative, considered safe by the SCCS up to 1%. French authorities advise avoiding it in wipes and diaper-area products for children under 3 as a precaution.

• Irritation:Can enhance penetration of other ingredients; avoid on broken skin.

A common emulsifier; CIR advises against use on damaged skin because it can carry other ingredients deeper.

A longer-chain paraben with measurable (though weak) estrogenic activity, prompting the EU to reduce its allowed concentration and Denmark to ban it in products for children under 3.

The paraben with the strongest endocrine signal in laboratory studies; the EU restricts it and bans it in leave-on diaper-area products for young children.

A branched-chain paraben banned in EU cosmetics since 2014; still occasionally found in products from other markets.

• Environmental impact:Poorly biodegradable; can remobilize heavy metals in waterways.

A metal-binding stabilizer that is safe on skin at the tiny amounts used; its criticism is environmental persistence.