Take ample amounts of Vitamin D and get some sunshine to bolster your immune system. From Joseph Mercola at lewrockwell.com:
All things considered, vitamin D optimization is likely the easiest, least expensive and most beneficial strategy that anyone can do to minimize their risk of COVID-19 and other infections in the coming months. Health authorities are already warning of a second wave of COVID-19 in the fall, which means the time to start addressing your vitamin D level is NOW.
We also have a pandemic of vitamin D deficiency, as more than 1 billion individuals worldwide, across all age groups, are deficient in vitamin D.1,2,3,4 Vitamin D deficiency has now been identified as a significant risk factor for positive COVID-19 status,5,6 severe COVID-19 infection7,8,9,10 and death thereof.11,12 I discuss this in “Vitamin D Is Directly Correlated to COVID-19 Outcome.”
In one study,13,14 which looked at data from 780 hospital patients in Indonesia, those with a vitamin D level between 20 nanograms per milliliter (ng/mL) and 30 ng/mL had a sevenfold higher risk of death than those with a level above 30 ng/mL. Having a level below 20 ng/mL was associated with a 12 times higher risk of death.
To improve your immune function and lower your risk of viral infections, you’ll want to raise your vitamin D to a level between 60 ng/mL and 80 ng/mL by fall. In Europe, the measurements you’re looking for are 150 nmol/L and 200 nmol/L. If vitamin D levels were increased in the global population, tens of thousands of people may be saved if or when COVID-19 reemerges.