Proper levels can reduce the risk of stress fractures, inflammatory injuries and upper respiratory tract infections.

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It therefore appears to be an attractive alternative treatment for upper respiratory tract infections.

BBC: Adults have two colds on average each year

They had had fewer upper respiratory tract infections by the age of one than the other group.

BBC: Doctors could predict which children are at risk of asthma

At my first M and M as a medical student, I heard the story of a patient who had received antibiotics for an upper respiratory tract infection.

CNN: More is not always better in medicine

In CIC clinical trials, the most common side effect were diarrhea (16% vs 5% placebo), abdominal pain (7% vs 6%), flatulence (6% vs 5%), upper respiratory tract infection (5% vs 4%), sinusitis (3% vs 2%) and abdominal distension (3% vs 2%).

FORBES: FDA Approves New Drug For Irritable Bowel Disorder (Update)

In 2003, during the severe acute respiratory syndrome epidemic, 76 percent of Hong Kong residents wore simple masks, and in this case, mask use was associated with a lower incidence of SARS, as well as upper respiratory tract infections and influenza.

CNN: Commentary: Flu and your health on a plane