I also take 50mg of Zinc daily. if I get a slight cold it seems to prevent cold sores
I was taking 4,000 IU daily for about two years and never got colds or flu. My doctor did blood tests and put me on 50,000 IU weekly...that was a month ago. I’ve seen no change from the increased dosage.
I started to get a cold recently and after looking at all the drugs with acetaminophen, among other things, I bought Cold Eeze...with zinc. It Worked Great! I was actually amazed.
I also take 5k/day D3. Sort of unusual for me to get a cold.