Go get some elderberry syrup. You can find it at stores like Rite Aid, CVS, and Target. According to the Loyola University Health System, elderberries have antioxidants that may help stop the flu virus from replicating. It won’t get rid of the flu – but it can shorten the duration of your illness and ease symptoms. The prescription? Mix 1 tablespoon of elderberry syrup into water or tea, 4 times a day.