|Herbal pain killer oils available are formulated to provide relief from pain, plus improve blood circulation & flexibility, and speeding healing process. When massaged on the affected areas, the oil relieves muscle tension and stiffness. Not just a herbal pain killer oil massage can cure arthritis, but also headaches and back pain. RHC Ortho Care pain oil and RHC Ortho Care natural pain reliever oil are two arthritis & joint pain oils that work similarly towards providing relief from pain in joints. Several natural materials are used in the preparation of these two oils. These are in oily liquid forms with a slightly viscous texture.