Zinc 'can treat the common cold'
16 February 2011 Last updated at 19:22 GMT
Taking zinc syrup, tablets or lozenges can lessen the severity and duration of the common cold, experts believe.
A review of the available scientific evidence suggests taking zinc within a day of the onset of cold symptoms speeds recovery.
But they say zinc cannot be used long-term because of toxicity concerns.
The BBC's Razia Iqbal reports.