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.
The RDAs of vitamin C for teens and children are: 1  toddlers 1-3 years old, 15 mg per day. 2  children 4-8 years old, 25 mg per day. 3  children 9-13 years old, 45 mg per day.  male teens 14-18 years old, 75 mg per 1  day. female teens 14-18 years old, 65 mg per  day.