One study in the Philippines found that for every standard deviation increase in vitamin D levels, people were 8x less likely to have a severe form of COVID-19 and 20x less likely to have a critical form of COVID-19.

In Indonesia, almost 100% of patients that died with COVID-19 were vitamin D deficient; 4% of patients that died from COVID-19 were vitamin D sufficient.

70% of the US population has insufficient vitamin D levels, which is considered to be a blood level less that 30 ng/mL.

Joe uses the sauna 7x a week at a temperature of 185 degrees for 25 minutes; Rhonda the same, but only 5x per week.

One of the main things besides age that regulates the immune system is previous exposure to viruses, and in particular one virus: the Cytomegalovirus (CMV). Between 50-80% of the US population has it by the time they're an adult.

People with type O blood are less likely to contract COVID-19.

African Americans are 28x more deficient in vitamin D than Caucasians.

1,000 IU of vitamin D will raise your blood levels by about 5 ng/mL.

At any given point, a person has antibodies against 10 different viruses—just randomly, so you're constantly being exposed to viruses.

Obese people are three times more likely to be vitamin D deficient in the United States.

Sitting in a 163 degree sauna for 30 minutes raises heat shock protein levels by 50%, and levels stay elevated for 48 hours afterward.

Joe & Rhonda supplement with 5,000 IU/day of vitamin D.