This will sound crazy but my water heater went out once when it was a blizzard. So I had to do cold rinse offs for awhile. I took vitamin D3. I never got sick. Now, I do this all winter long and I don’t get sick.
Cold showers and Vitamin D3.
But I can tell you a cold rinse off is no fun.
There is some info on the internet about cold helping with issues but I have never bothered to investigate.
That reminds me of the time I rented an apartment, in college, for Spring semester. I contacted all of the utilities, but one...the gas company. I took ice cold showers for a couple of days, until the gas company could get out to turn on the gas. Brrrr. Good lesson learned.
Forces your body to raise its temperature, like a fever, which kills off virii.
Theres people that swear by the cold water method. I’m guessing it has a lot to do with the shock it puts on your system.