Doctor Hoy’s Natural Pain Relief Gel combines time-release menthol, camphor, and arnica, a natural anti-inflammatory, for fast-acting and deep pain relief from muscle strains and soreness, simple backaches, joint pain, and inflammation. This natural topical pain reliever warms and prepares muscles before activity and aids in recovery. Natural Pain Relief Gel is fast-acting with quick absorption that dries clean and has a vanishing scent. Doctor Hoy’s is safe for repeated use for relief that lasts hours. Doctor Hoy's products are for external use only.