Many immune boosting remedies, especuially for children, include elderberries. Elderberries work well to prevent or cure colds and the flu. You can use fresh elderberries or dried elderberries.
Andrea of Frugally Sustainable uses elderberries, echinacea root and a variety of other immune-boosting ingredients in this recipe. The recipe is really easy. Andrea provides dosing recommendations and cautions against giving this remedy to children younger than 1 year old.