A counterirritant is an agent that causes local or superficial inflammation of the skin in order to relieve inflammation in deeper structure. We use the counterirritants Myrrh and pure Menthol, derived from Peppermint Oil, in our deeply soothing All Natural Muscle Rub. The Menthol cools and heats the skin, and the Myrrh encourages surface blood flow. By doing so, both ingredients help heal underlying inflammation and muscular soreness.