NAF Five Star Respirator Boost 1 Litre. The NAF Five Star Respirator Boost is a natural formula that helps to maintain your horses breathing. If you horse has summer allerigies, if you dread a high pollen count, if your horses stable gets dusty or you need a breathing product legal under FEI competition rules then this is the supplement you need. NAF Five Star Respirator Boostprovides nutritional support to the respiratory mucosal immune system and the blood vessels that surround the lungs. Respirator supplements the horse's diet with a concentrated solution of naturally sourced anti-oxidants with herbs such as ginger, rosehip and blueberries. Read more… Respirator also contains Echinacea and essential oils. Respirator is ideal for use when close contact with other horses showing respiratory stress may be a cause for concern. Horses and Ponies Daily Recommended Daily Amounts Loading Rate (1-10days) - 60 to 90ml per day Maintenance Rate - 30ml per day A 1 Litre bottle fed at the maintenance rate of 30ml per day will last approximately 33 days.