As reviewed in “Vitamin D Level Is Directly Correlated to COVID-19 Outcomes,” there’s compelling evidence to suggest optimizing your vitamin D level can reduce your risk of COVID-19 and other viral infections such as seasonal influenza.

A number of different scientists are calling for people and governments to prepare for the second wave of COVID-19 come fall, both in the U.S. and abroad.1 Considering SARS-CoV-2 has been shown to be responsive to temperature and humidity, with infectiousness increasing with lower temperatures and humidity levels, we’re likely going to see a reemergence of COVID-19 infections in the fall, during normal influenza season.