Years ago when zinc became famous for reducing the duration and effects of the common cold I did my own experiments and noticed not one iota of difference. I was and am a meat eater and so likely got sufficient zinc from my diet to do all the things that zinc is supposed to do when your body is attacked by a virus.

I think it's safe for any medical practitioner to assume that if there are shortages going into a viral attack then remedying them pronto is a good idea. Zinc, vitamin D and a bunch of other nutrients are needed to fight off sickness. The worse your diet...the worse the illness will be.

Good coffee, good weed, and time on my hands...