@Kat919 - I thought it was homeopathic, too, but after reading the article, I'm not so sure. The idea with a homeopathic remedy like arnica is that like cures like, but in dilution. So the plant arnica is made from would actually cause pain and inflammation, I suppose. Supposedly, diluting the like substance a great deal makes it more effective.
But the article says that the plant has anti-inflammatory properties, which doesn't follow the law of similars. So I'm not sure. I'll stick to good old ibuprofen for anti-inflammatory!