IntroductionDuring the coronavirus disease 2019 (COVID-19) pandemic. vitamin D has been established as an immune-modulator that reduces pro-inflammatory damage which effectively diminish the severity of COVID-19. Vitamin D also has a significant effect against influenza and dengue and increase the seroconversion following influenza vaccination. To date. https://www.goodvibesbadhabiters.shop/product-category/handheld-machines/