“So I’m a believer in Vit D, zinc, NAC, Vit C, Quercetin, melatonin, and Black Seed Oil.”
I take those and others with the exception of black seed oil, and do not get colds, but sure as heck got hit by COVID (3 times).
I took shot #1 & #2, booster #1 and quit. No COVID yet. My wife, either. Nor our three kids, 2 vaxxed, one not.