This is THE BEST supplement! My horse had a terrible cough that was caused by an allergic reaction to round bale hay. It was a wet, long lasting cough that once he started, he had trouble stopping. Open Air EQ helped him shed the excessive mucus that had built up in his lungs, and although it appeared that it was making things worse, the fact was, it was WORKING! Not only did it help with the coughing, it loosened the mucus and he was able to cough it up and clear out his lungs!! So far, this winter he has not coughed at all. He is on small, square bales. I have not needed to give him any since last winter. The summer dust didn’t phase him and these cold winter days have not caused any issues either! I have my Open Air EQ on hand in case he has a set back, but I honestly feel, Open Air EQ was pivotal in his recovery.