I also put a few drops of hydrogen peroxide in my ears if I feel I'm coming down with something, though I just leave it in for about 30 seconds, and take vitamin C throughout the day for a few days, and whatever it was almost never progresses into an actual cold or flu.

I've never had a flu shot, as I don't trust modern medicine, which is focused on selling pharmaceuticals and surgeries, not on healing people with the most natural and least invasive treatments possible.