We included Black Pepper essential oil in our muscle pain roll-on because it is high in an antioxidant compound called piperine, which reduces inflammation and promotes healing. In several studies, the piperine in Black Pepper was found to reduce swelling, stiffness, and joint pain. Black Pepper also helps our body absorb and metabolize other antioxidants more effectively, which “boosts” the anti-inflammatory properties of other essential oils.