Shampooing éclat couleur — ingredient safety report

• 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.

• Irritation:Drying when high on the ingredient list; negligible in trace amounts.

Plain ethanol — position on the label matters: near the top it is drying; near the bottom it is a harmless solvent trace.

• Allergy risk:EU-declarable allergen; oxidation products are potent sensitizers.

The citrus-peel scent molecule. Like linalool, it becomes allergenic mainly after oxidizing in opened products.

• Allergy risk:EU-declarable allergen; oxidized linalool is a common patch-test positive.

A floral scent molecule found in lavender and many essential oils. It oxidizes on air exposure into strongly sensitizing compounds, which is why it must be declared on EU labels.

• Allergy risk:EU-declarable allergen; lemon-scented sensitizer.

The lemon-scent molecule in lemongrass and citrus oils, a recognized contact allergen requiring EU label declaration.

• Allergy risk:EU-declarable fragrance allergen.

A rose-type scent component on the EU's mandatory-declaration allergen list.

• Irritation:Milder than glycolic; still increases photosensitivity.

A gentler AHA that exfoliates and hydrates simultaneously; the usual pick for drier or more reactive skin starting acids.