Fir Needle Oil Non usare Fragranza sintetiche e naturali No known benefits Fir Needle Oil description Volatile, fragrant oil that can cause skin sensitivity. According to the Natural Medicines Comprehensive Database, “The essential oil also acts as a rubefacient (counterirritant) and improves circulation when applied externally.” A counterirritant is defined as any ingredient that causes sensitisation or a mild swelling of the skin to alleviate uncomfortable symptoms deeper within skin.