Wellness Mind & Body Can Vitamin C Fight Off a Cold? By Health.com Editorial Team Health.com Editorial Team An article by 'Health.com Editorial Team' indicates a collaborative effort from our in-house team. Sometimes, several writers and editors may contribute to an article over the years. These collaborations allow Health.com editors to provide you with the most accurate, up-to-date, and comprehensive information available. The editors at Health.com are a dedicated team of experienced health editors, writers, and other media professionals who strive to bring trustworthy and responsible health and medical content to their readers. As a team, we have decades of experience in health journalism, and have worked at legacy publishers and some of the biggest news and media companies in the U.S. health's editorial guidelines Published on September 4, 2001 Share Tweet Pin Email The recent review of research that pooh-poohed vitamin C for colds isnt the last word. Some researchers argue that the dosage used in many of the studies reviewed by the Cochrane Collaboration was too low (500 milligrams), and that because you lose a lot of C when you urinate, you need repeated dosing to knock out a cold. “Taking C early on can help reduce the severity of colds, but its not clear why,” says Mary L. Hardy, MD, medical director of the Simms/Mann–University of California, Los Angeles, Center for Integrative Oncology. She recommends taking 500 mg twice a day at the first sign of a cold and continuing for five to seven days. In fact, studies show that among people who are under physical stress (marathon runners, skiers, and those living in very cold climates) 1,000 mg of C daily cuts the incidence of colds in half. Was this page helpful? Thanks for your feedback! Tell us why! Other Submit