YSL Libre Eau de Parfum

Ethanol-based solvent carrier (~80% of formula). Drying to skin but otherwise inert.

Trade-secret blanket term that legally conceals dozens to hundreds of individual aromachemicals. Designer fragrance blends almost always contain synthetic polycyclic musks (Galaxolide, Tonalide) — endocrine disruptors that bioaccumulate in human fat tissue, breast milk, and wastewater — alongside Ambroxan, Iso E Super, and historically DEP phthalate solvents. No disclosure obligation in the US.

Solvent; safe.

IFRA / EU-declared fragrance allergen. Oxidizes on skin and in the bottle into stronger sensitizers; one of the top causes of fragrance contact dermatitis. Required label disclosure means it is present above 0.001% in this leave-on product.

IFRA / EU-declared fragrance allergen. Air-oxidized linalool hydroperoxides are confirmed contact sensitizers — exposure is high in spray-on fragrance.

IFRA / EU-declared fragrance allergen and weak photoallergen. Recent SCCS reviews have raised concerns about possible endocrine activity at typical fine-fragrance use levels.

EU 26 fragrance allergen and well-documented strong dermal sensitizer. The closely related Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde (HICC / Lyral) was banned by the EU in 2021 for the same class of sensitization issues; hydroxycitronellal itself remains restricted but is repeatedly cited in patch-test registries as a top fragrance allergen.

IFRA / EU-declared fragrance allergen with mild preservative function; contact dermatitis is documented in spray fragrances.

Chemical UV filter used to prevent fragrance photodegradation. Salicylate-class skin penetrant; detected in human urine after topical use. Used purely to protect bottle aesthetics, not to provide sun protection.

Chemical UV filter added to prevent fragrance discoloration in clear bottles. Documented photoallergen; mild estrogenic activity in cell and animal studies. Unnecessary in a product that isn't a sunscreen.

IFRA / EU-declared fragrance allergen. Category 2 skin sensitizer; the EU SCCS has flagged it for cumulative exposure risk across multiple fragranced products.

IFRA / EU-declared fragrance allergen with rose-like odor. Documented skin sensitizer; oxidation products are even more reactive.

Synthetic floral aromachemical (grape-like). Not on the EU 26 allergen list but mild photo-sensitizing potential is reported. Benign at fine-fragrance levels.

IFRA / EU-declared fragrance allergen. Recognized dermal sensitizer; one of the most frequently cited fragrance allergens in patch-test studies.

IFRA / EU-declared fragrance allergen with strong sensitizing potential — IFRA restricts maximum use levels in leave-on products specifically because of its high contact-allergy rate.

EU 26 fragrance allergen and a top-strength dermal sensitizer per IFRA. Use level in leave-on products is capped at 0.02% by IFRA because of its high allergic-contact-dermatitis rate.

IFRA / EU-declared fragrance allergen; recognized dermal sensitizer with cumulative-exposure concerns.

IFRA / EU-declared fragrance allergen with floral-musky odor. Documented dermal sensitizer.

Coal-tar azo dye used for the bottle aesthetic. Azo dyes are a known class of contact sensitizers in topical/leave-on products and are phased out by clean-formulation brands.

Coal-tar azo dye (Tartrazine) added for bottle color. Frequent contact-sensitizer in topical products; aesthetic-only addition. FDA-banned in foods in California (2024) for behavioral effects.

Coal-tar-derived violet dye (Ext. Violet 2) added purely for bottle aesthetics. Provides zero functional benefit on a leave-on spray product. Documented skin sensitizer in EU SCCS reports.