An increase of vitamins A, E and D may reduce a person's risk for breathing and respiratory conditions. The added benefits of the supplements may even protect you against the flu and COVID-19. According to UPI, people who consumed recommended amounts of the nutrients were less likely to develop a respiratory illness. Research has linked vitamin D, in particular, with boosting immune system function. A deficiency in vitamin D has also been found to increase a person's risk for severe COVID-19.
