For the winter I used elderberry lozenges. The gummy version has 50mg of black elder extract, 7.5 mg of zinc citrate and 90 mg of Vitamin c per lozenge.
Lozenge because they melt in the mouth and contact the throat before entering the stomach.
Nature's Way because they have a pleasant taste and show how much elderberry is in a lozenge.
They seem to control nasal congestion and that alone makes them worthwhile to me.