Myrcene

β-Myrcene is a naturally occurring monoterpene hydrocarbon found in essential oils of hops, thyme, mango, and lemon grass. In car care products it appears at trace concentrations (< 0.001%) as part of fragrance blends — at those levels it contributes no meaningful hazard classification to the finished product. Confirmed biodegradable; not on the Prop 65 list; not classified as an asthmagen.