Definition
Methyleugenol is structurally related to eugenol (the dominant compound in clove bud essential oil) but carries an additional methoxy group that gives it a lighter, less harsh character: spicy, rose-like, balsamic, with slightly green and woody facets. It occurs naturally in basil oil (up to 80% in some chemotypes), tarragon, bay laurel, ylang-ylang, and rose absolute (ISIPCA teaching materials, accessed 2026-05-27).
IFRA restricted methyleugenol following RIFM studies indicating genotoxicity in rodent assays. Usage limits are now strict across all product categories, which has affected the formulation of naturals-heavy compositions relying on basil, tarragon, and ylang-ylang.
Impact on niche perfumery
IFRA methyleugenol restrictions have required reformulations of compositions relying heavily on tarragon, basil, and Bay laurel essential oils. Perfumers now use fractionated or purified versions of these oils with reduced methyleugenol content, or substitute synthetic alternatives.
The restrictions illustrate the tension between natural-materials advocacy (which some niche brands champion) and regulatory reality: "all-natural" does not mean unregulated, and many natural materials carry ingredient-level restrictions as strict as synthetics (Basenotes wiki, accessed 2026-05-27).