Bromelain - Bromelain Is An Enzyme That Helps Reduce The Swelling Of Mucous Membranes From Allergies And During Times Of Respiratory Stress Stinging Nettle - Our Proprietary Formula Includes Stinging Nettle, Which Provides Well-Known Support Against Seasonal Airborne Substances Bitter Orange - Bitter Orange Contains Synephrine, Which Helps The Body Support Open Airways Natural Sinus Relief - Histablock Provides Nutrients That Support Healthy Respiratory Function As The Body Battles Irritants, Pollutants And Toxins