You know... in my family. Everyone had + for covid. I never wore a mask at home. At the time, I didn't have a vaccination. All I took was Dr Berg's Vitamin D3/K2 at 20000iu per day. And I got nothing. I saw videos on yotuube saying that those with super doses of Vit D3/K2... have less symptoms and most don't even know they get it. Dunno...I have never been sick and many people around me have had it.