Glycyrrhizin and Mannitol Nasal T…in Chronic Rhinitis.

In a 30-day study of 55 people with chronic rhinitis, a nasal spray combining glycyrrhizin and mannitol reduced all four major nasal symptoms (measured by patient reports) and lowered inflammatory cells in the nasal lining. The treatment worked for both allergic and non-allergic rhinitis, though it was more effective at reducing certain immune cells in allergic cases.