Which of the following represents the results of a review of well-controlled studies of vitamin C supplementation on the resistance to, and recovery from, colds? There was a reduction in the duration of colds by 50% on the average. There was a slight effect on reducing the duration and severity of colds for people taking vitamin C supplements. There was a significant reduction in the duration of colds in people who consumed at least one gram a day. There was a significant reduction in the number of colds only in people who consumed > three grams per day.
