Geraniol

Geraniol is a fragrance allergen naturally present in many essential oils and is used at low concentrations for scent, but even trace levels can provoke stinging or dermatitis in sensitized or barrier-impaired skin. Patch testing and clinical experience consistently identify geraniol as a relevant contact allergen, with higher risk in eczema-prone individuals and in leave-on products where cumulative exposure occurs. Given its sensitization potential and the high stakes for reactive skin populations, it warrants a high irritancy score. Safety Notes: In mass-market skincare, geraniol is most often present as a trace constituent of fragrance/essential-oil blends, with finished-product levels commonly in the ~0.0001–0.05% range (especially in leave-on products where allergen labeling thresholds apply). Higher consumer-available levels occur in heavily fragranced natural/essential-oil-focused balms, body products, and perfumed creams where fragrance loads are higher and the geraniol fraction can push the finished-product concentration to ~0.2–0.8%. Levels above this are atypical for mainstream OTC skincare due to sensitization risk and IFRA-driven formulation limits, especially for leave-on facial products.