Three powerful ingredients. Arnica. MSM. Aloe Vera. DOCTOR HOY’S™ Natural Arnica Boost attacks pain and inflammation by stimulating circulation. Arnica Boost was designed for impact injuries, joint pain, arthritis, neuropathy, muscle soreness, and rapid bruise relief. Arnica Boost is unscented and has no sensation. It is safe for sensitive areas such as face and groin. Expect hours of relief! Perfect for the training and/or therapy room!