Upon looking at another source from the National Library of Science, similar research was concluded that consuming Vitamin C can aid recovery time upon getting a cold. This article states that it, "decreased severity and duration of colds when vitamin C is consumed at doses at or above 0.2 g/day, it is most reasonable for patients to obtain this from their diet, considering supplementation did not decrease the overall incidence of colds in the general population." Therefore, stating that it isn't a prevention tool, nor something that once taken can rely on to cure or keep common colds away.