Elderberry extract
Intercontinental air travel can be stressful, especially for respiratory health. Elderberries have been used since "ancient times" and in some observational and clinical studies as supportive agents against colds and flu.
During this study, cold attacks, duration of the cold and symptoms were recorded in a daily diary of air travelers.
Travelers who used elderberry from 10 days before travel until an average of 4-5 days after arriving abroad experienced a 2-day shorter duration of the cold and also noticed a reduction in cold symptoms.
Study on three hundred 50 year olds who took 300mg Elderberry Extract daily.