Elder berries, dried or fresh, have been shown to be more effective at preventing the flu than a flu shot and more effective at shortening the duration of a flu bout than the much-prescribed Tamiflu, which is losing effectiveness through resistance, something that can never happen with elder berry.
Dried Elder Berry Tincture:
Fill any size jar no more than half full of dried elder berries. Fill jar to the top with 100 proof vodka. Cap, label, wait for six weeks, and use.