Betadine Natural Cold Defence Nasal Spray is a natural solution designed to help shorten the duration of viral-related cold symptoms. The spray contains Carragelose, a natural ingredient derived from red seaweed that helps protect against cold viruses. The nasal spray works by forming a protective barrier in the nasal cavity that can help trap and inactivate cold viruses. It is suitable for use at the first signs of cold symptoms. The 20ml bottle format makes it convenient for regular use during cold and flu season. As this is a medical product, please consult the package insert or your healthcare provider for complete usage instructions and safety information.