According to researchers at Royal Hallamshire Hospital, Sheffield, and the University of Leicester, both in England, senior are the fastest growing segment of the population in the developed world. As people age, their chance of acquiring an infection increases. Older people are up to 10 times more likely to die of infection than younger adults, the researchers say.

In light of these facts, there has been growing interest-and a growing market-in vitamin supplements aimed at reducing the risk of infection. According to the study, 20% to 30% of people in developed countries already use these supplements, despite a lack of scientific evidence supporting their use.

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