Since taking 7000IU of vitamin D-3, along with 400mg of magnesium (threonate), along with the quercetin, for many years now, I've not had a single viral disease.
I been taking a similar regimen, adding Vitamin C, for two years now--not sick once with anything, especially Covid. I also have several courses of Ivermectin and Hydroxychloroquine in the closet that I sourced in India just in case. But I was an idiot and did take the first two jabs before the truth about these harmful jabs came out.