Linalool

Linalool is a fragrance component (often from essential oils) used at low levels, but it is a well-documented contact allergen, especially after oxidation, and is frequently implicated in positive patch tests in fragrance-allergic and eczema populations. Even at typical leave-on concentrations, it can trigger stinging, dermatitis flares, and delayed allergic contact dermatitis in sensitized or compromised skin. Given the high risk profile for sensitive/eczema patients and the preventable nature of fragrance reactions, I score it as a significant irritant/sensitizer. Safety Notes: In consumer skincare, linalool is most often present as a trace constituent of fragrance/essential oils, with many lightly fragranced leave-on and rinse-off products containing it around ~0.0001–0.05% as an allergen-level component that may still trigger EU labeling when exceeding thresholds (0.001% leave-on, 0.01% rinse-off). At the high end, strongly fragranced products and natural/essential-oil-forward balms, body butters, and perfume-like skincare commonly reach ~0.5–2.0% linalool when the overall fragrance load and linalool-rich oils are high; higher levels are uncommon due to sensitization risk and odor impact rather than a strict cosmetic maximum limit.