Zinc lozenges show more promise than vitamin C for cold relief

Scientific research provides varying levels of evidence regarding common over-the-counter remedies for the common cold. Zinc lozenges, specifically those containing zinc acetate or zinc gluconate, have shown the most credible potential for reducing cold duration. Studies indicate that taking more than 75 mg of elemental zinc per day via lozenges that dissolve slowly in the mouth can shorten a cold by approximately 28% to 40%.

In contrast, the effectiveness of vitamin C is more limited. While vitamin C was popularized as a preventative measure by Nobel laureate Linus Pauling in 1970, subsequent research has challenged his claims. Evidence suggests that while regular vitamin C intake might modestly ease symptoms, it does not serve as an effective general method for preventing colds.