Research shows that by supplementing the diet with naturally sourced anti-oxidants, the horse's lungs can be given valuable support. Respirator contains a concentrated solution of natural anti-oxidants, chosen for their targeted support of healthy lung function. Echinacea is also included for immune system support. Respirator is also recommended where close contact with other horses showing respiratory stress may be cause for concern. Essential oils in Respirator Boost help maintain clear airways.