The truth about using zinc and vitamin C to cure your cold
In short: We often reach for zinc lozenges or vitamin C powders at the first sign of a sniffle, hoping for a quick recovery. But do these popular immune boosters actually work, or are we just paying for a metallic taste and a placebo effect?
While vitamin C and zinc are frequently marketed as cold cures, the scientific evidence suggests they are far from magical. According to family medicine physician Shaina Rood, DO, these supplements do not actually prevent you from catching a cold. Instead, their impact is limited to very slight adjustments in how your body handles the illness once it has already taken hold.
Zinc presents a difficult trade-off. Although studies suggest zinc can reduce the length of cold symptoms by several days, adverse side effects frequently occur. Users frequently report nausea, diarrhea, and a persistent metallic taste in the mouth. Because of these downsides, Dr. Rüssel does not recommend zinc for treating colds.
Vitamin C is a critical nutrient for the immune system, but it is not a shield against infection. Some studies suggest that daily doses might slightly reduce the severity and duration of a bad cold. In particular, scientists observed that patients might experience recovery roughly 13 hours earlier throughout a standard seven-day bout of illness. However, high doses are not a shortcut; you cannot expect a single dose to prepare you for an event the next day.
It is also important to avoid excessive intake. The U.S. National Institutes of Health (NIH) sets the tolerable upper intake level for vitamin C between 400 mg and 2,000 mg per day, as doses exceeding this can cause abdominal cramps and nausea. For context, the NIH recommends a daily minimum of 90 mg for men and 75 mg for women. Many people mistakenly attribute recovery to these supplements when, in reality, the body is simply running its course or experiencing a placebo effect.
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Sources
- Summary by Intellect · source: Can Vitamin C and Zinc Help Cure Colds?
- Also: Should You Try Vitamin C or Zinc for Colds?
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