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The Boston Globe

Health & wellness

Be Well

Study: Vitamin D pills fail to prevent colds

Taking vitamin D supplements does not ward off the common cold, according to a new study that contradicts some previous research suggesting it might have a protective effect.

The study, conducted in 2010 and 2011 by researchers at the University of Otago in New Zealand and Harvard Medical School, included 322 healthy adults in Christchurch, N.Z. Half of the adults were randomly assigned to receive an initial pill containing 200,000 international units (IU) of vitamin D, followed by another pill one month later and then half the dose monthly for 18 months. The other half was given the same schedule of placebos.

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