More info: Peppermint: Is used for colds, flu, fevers, gas and mild digestive disorders. Elder Flowers: Commonly used in the first stages of cold and flu. Yarrow: Used for a wide variety of common acute complaints. These include treatment of common cold, flu, fevers, hypertension, painful menstruation and bleeding. Thyme: Thyme is used for acute and chronic respiratory affections, including coughs and colds. It is also useful for gastrointestinal problems such as gas, indigestion, and diarrhea.