Since aging reduces vitamin D production in skin, we have that vitamin D level is correlated with age that is correlated with worse response to COVID-19. Aging

Since aging reduces vitamin D production in skin, we have that vitamin D level is correlated with age that is correlated with worse response to COVID-19. Aging reduces vitamin D production in skin. There is a decrease in the concentration of 7-dehydrocholesterol in the epidermis in old compared with young individuals and a reduced response to UV light, resulting in a 50% decrease in the formation of previtamin D3