First you need to make an infusion or decoction of mountain ash fruits, and then add them to vitamin tea. It is best to strengthen the action of mountain ash with anything else. Especially in this capacity, rosehip is recommended. It is necessary to take half a tablespoon of mountain ash and the same amount of rosehip, pour two glasses of boiling water and let the day brew in a closed vessel. During the period of epidemics of colds, you can add honey with milk to the resulting tea for greater efficiency to the received tea.