Diet and exercise can keep you healthy. You need to keep your immune system strong. Zinc picolinate, Vitamin C, D-3, A, and Iodine. Iodine is a bit challenging to find. Use iodized salt, of course, but too much salt is bad. I buy granulated kelp and sprinkle in in tomato juice with a slice of lemon, or on a salmon patty (Costco has great wild-caught Alaskan salmon patties at a reasonable price).
My Doc has given EVERY patient this list
1. 1000 mg Vitamin C
2. 500 mg. Zinc
3. 5000 mg Vitamin D3
4. 500 mg Quercetin
5. 600 mg N-A-C sustain (this gets the zinc into the cells)
My Doc also gave me a script for Hydrocloroquine and Zpack if by some RARE chance I should get a sore throat AND fever start taking the script immediately!!