Why Vitamin C and Zinc May Not Be the Cold Remedies You Think

As cold and flu season approaches, many turn to supplements for protection. Vitamins and minerals like zinc and vitamin C are popular choices, but their actual benefits remain limited. Experts continue to recommend simpler, time-tested remedies instead. Vitamin C has long been touted as a defence against colds, yet research shows it offers little help. For most people, it does not reduce the chance of catching a cold. Even when taken regularly, it may shorten symptoms by less than a day—only in those already using supplements. The German Nutrition Society suggests daily intakes of 95 mg for women and 110 mg for men, with smokers requiring even more. However, excessive amounts can cause stomach or digestive problems. The nutrient is also sensitive to heat and light, meaning its levels in food can vary widely.

Zinc, another common remedy, fails to prevent or shorten colds, according to a Cochrane review. While the European Food Safety Authority sets a safe upper limit of 25 mg per day for adults, taking it risks side effects. These include altered taste and stomach discomfort, outweighing any proven benefits. Health authorities still favour basic measures for cold prevention. A balanced diet, fresh air, and warm drinks remain the most reliable ways to stay healthy during winter months.

Neither zinc nor vitamin C provides strong protection against colds or flu. Supplements carry risks, from stomach issues to unpleasant side effects. For now, traditional advice—good nutrition, hydration, and fresh air—stays the safest approach to winter wellness.