Max
I feel for you as I was so careful before any surgery and any marathons.
I am a firm believer in Vitamin C , for colds especially. I know Jo has already told you that.
My oldest son came to visit and had a horrible sounding cold after a few days, I gave him chewable Vitamin C, 1,000mg tablets and echinachia. He was fine in about 2 days. I took lots of Vitamin C as I usually do when around someone with a cold.
I do have to admit though, I will take about 10,000mg a day for a few days!!
Judy