Sinomarin Cold & Flu Relief is a 100% natural nasal decongestant designed to relieve the nasal symptoms of influenza and the common cold. Sinomarin Cold & Flu Relief is beneficial because of the decongestant effect (by osmosis) of saltwater hypertonic solution (2.3% NaCl), as well as the anti-inflammatory and antibacterial qualities and actions in the upper respiratory tract, essential oils of eucalyptus and mint as extract, and thyme.