The Olbas Anti Allergy Nasal Spray not only relieves symptoms, but it helps prevent them too. The main composition of the product is made up from saline solution, xanthan gum, aloe vera and essential oils. This premium composition mix helps the nasal spray to form a protective film over the nasal mucosa preventing the contact of allergens, while the natural essential oils keep the nasal cavity feeling fresh and moisturised. As a result, the nasal spray is effective in preventing allergies from displaying their symptoms, as well as helping to relieve them after the first symptom has been displayed.