A staple in first aid kits, Arnica has earned every bit of its fame as one of the most successful remedies for contusions, bruises, and aches. The most prevalent form of the plant, Arnica montana­, has been shown to ease the sting of insect bites, soothe the stiffness that often arrives from long stints of driving, and relieve sore muscles after a tough workout. As the Mayo Clinic puts it, Arnica helps “stimulate the body’s self-healing response,” thus hammering home the whole concept of homeopathy.