DOCTOR HOY S Natural Arnica Boost stimulates circulation to promote healing. Witch Hazel draws the active ingredients in quickly to promote rapid pain relief action. Although there is no sensation, you should expect pain relief within a few minutes and enjoy the benefits for several hours. Arnica Boost is versatile and can be used on sensitive areas of the body, open abrasions, and to calm nerve pain. Apply immediately after an impact injury to speed through the bruising process. Arnica Boost can be used alone or combined with the DOCTOR HOY S Natural Pain Relief Gel to extend relief time and expedite the healing process.