It takes about two days to get a cold after exposure to the virus. In this video, Larry Gooss, DO, a family practice doctor at Chippenham & Johnston-Willis Hospitals, explains how virus can continue to live on surfaces.
A RealAge answered. To prevent vitamin C deficiency, government guidelines recommend a daily dose of 90 milligrams (mg) for men, 75 mg for women. We recommend that you get 1,200 mg of vitamin C per day from food and supplements. This higher amount not only prevents deficiency but also helps prevent disease and needless aging.
When thinking of good sources of vitamin C, citrus fruits typically come to mind, and rightfully so. These fruits are rich sources of ascorbic acid, often providing more than a full day's recommended dietary allowance in a single serving. The RDA for vitamin C is 75 milligrams daily for women and 90 milligrams for men.