Your go-to source of info is my guide, How to Not Get Sick.
Covered in it:
Stocking your cabinets
Nutrients to focus on for immunity
At the first sign of a suspicious sneeze
If you get sick, what to do: week 1, week 2
If you’ve gotten sick and are not recovering like you should, go to my guide on “How to Finally Get Rid of Your Lingering Cough”
For the science on how to leverage nutrients to keep from getting sick, see my course, Nutrition and Immunity.
So are the linked materials now available free, or still behind the paywall? I apologize, but it’s not clear to me. I would like to send to others but want to set appropriate expectations for them. I know some of the relevant podcast episodes (e.g. zinc for colds) are available free.