Swap vitamin C for D.
We all know that loading up on vitamin C will help zap the first sign of a cold. Turns out we’re all wrong. “You could eat snowflakes and two days later you’ll feel better,” says William Schaffner, an infectious-disease expert at Vanderbilt University. “That’s just your immune system doing its job.” The evidence is mixed at best for taking C, echinacea, and even zinc, according to the experts we consulted. What is actually proved to bolster immunity, says Dr. Evangeline Lausier of Duke Integrative Medicine, is vitamin D. The nutrient helps decrease inflammatory proteins and increase antimicrobial ones. You can’t get enough through food alone, so take 2,000 IU daily.
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