I am having a hard time finding non medicated so I am left with medicated it looks like(my list is slowly going down! First no organic, now no non-medicated)! One feed co I am looking at has this: Bacitracin Methylene Disalicylate as their "active" ingredient...what is that?? Also does anyone know what the medicated purina stuff has in it? All the purina places around only carry the start and grow as medicated so I was curious to see what their "active" ingredient was since I can't seem to find the label online. Thanks!