“Vitamin C prevents the common cold.”

The widespread belief that vitamin C can prevent the common cold largely stems from the influence of Nobel Prize-winning chemist Linus Pauling. In the 1970s, Pauling published a popular book, "Vitamin C and the Common Cold," where he advocated for taking large doses of vitamin C to ward off and alleviate cold symptoms. His esteemed scientific background lent significant credibility to these claims, leading many people to adopt vitamin C as a primary defense against seasonal sniffles, despite a lack of rigorous scientific consensus supporting his assertions at the time.

However, extensive scientific research conducted since Pauling's initial claims has largely debunked the idea that routine vitamin C supplementation prevents colds in the general population. Multiple comprehensive reviews have concluded that taking vitamin C regularly does not reduce the incidence of catching a cold. There is, however, some evidence suggesting that consistent, daily intake of vitamin C might slightly reduce the duration and severity of cold symptoms if a person does get sick. For instance, studies indicate an average reduction in cold duration of about 8% in adults and 14% in children who take vitamin C regularly. It is important to note that starting vitamin C supplementation once cold symptoms have already appeared generally shows no significant benefit in shortening the illness or lessening its severity. An exception to this pattern is observed in individuals undergoing extreme physical stress, such as marathon runners or soldiers in subarctic conditions, for whom vitamin C may halve the risk of catching a cold.

The persistence of this myth can be attributed to several factors. Pauling's celebrity status as a two-time Nobel laureate made his pronouncements highly influential, even when they diverged from the broader scientific community's findings. Additionally, vitamin C is a vital nutrient known to support various bodily functions, including immune health and collagen production, leading to a general perception that "more is better" for immunity. Coupled with its low cost and perceived safety, many individuals continue to reach for vitamin C with the hope of preventing colds, even if the scientific evidence does not fully support this particular application.