Headaches Allergy and Sinus The all-natural ingredients in Nasol perform a specific task in relieving headaches, allergy and sinus symptoms. Capsaicin is the all natural active ingredient in Nasol and is a clinically proven analgesic or pain reliever. Nasol desensitizes the mucous membranes in the nose making them less irritated by airborne particles, relieving allergies and sinus congestion fast. Nasol Nasal Spray quickly relieves headache pain, allergy symptoms and sinus problems. Nasol will stimulate secretions that help clear congestion and mucus from your sinuses while keeping them bacteria and infection free. A daily regimen of Nasol will keep you breathing clearly and easily each and every day.