Nelsons arnica cooling gel is a gentle yet effective product containing natural arnica specially formulated it combines the benefits of arnica with the refreshing sensation of natural grapefruit oil and menthol to cool and soothe the skin it is also perfect to ease aching muscles following physical exertion or to revive tired heavy legs after being on your feet all day arnica has been recognised for its invaluable natural properties since the 16th century and used by millions today world