What's the best way to boost the immune system? Given the whole Corona Virus thing going on, I've been wondering a good way to boost your resistance to disease. Right now I'm trying to get enough sleep and keep some kind of routine and taking vitamins and occasionally vitamin C; though I hear vitamin C taken orally doesn't do much, but intravenously can supposedly help when sick, and anally probably doesn't work at all (who wants to try?).