Bromelain is obtained from the lower stems of the pineapple plant. It contains a combination of proteolytic enzymes that have been shown to support a healthy inflammatory response.  It is believed to work by supporting a healthy balance of proinflammatory and anti-inflammatory prostaglandins.  Bromelain is also effective at breaking down large proteins (proteolytic activity) that, when absorbed intact and travel through the bloodstream, may cause an allergic response by the body. Some clinical evidence also demonstrates bromelain's ability to help support a normal rather than excess production of mucus along the respiratory tract.