SARS-CoV-2 started spreading toward the end of 2019 causing COVID-19. a disease that reached pandemic proportions among the human population within months. The reasons for the spectrum of differences in the severity of the disease across the population. and in particular why the disease affects more severely the aging population and those with specific preconditions are unclear. https://www.markymarkscott.com/product-category/b6biotin-inforcer-conditioner/