Menthol facilitates inhalation, stimulating the secretion of mucosa by means of opening bronchial.
Mint has an antiseptic effect, and gives sense of freshness.
Eucalyptus has an expectorant effect by means of softening the chest. Furthermore, ginger has antibacterial and antifungal effects in body.
All drops help decreasing the risk of having infected with upper respiratory infections. Licorice and Vitamine C have preventive roles against upper respiratory infections.