By Mayo Clinic staff
The cold-fighting reputation of zinc has had its ups and downs. That's because many zinc studies, both those that find the mineral beneficial and those that don't, are flawed. In studies with positive results, zinc seemed most effective taken as a lozenge or nasal spray within 24 hours of the appearance of cold symptoms. Taking zinc with food may reduce side effects, such as a bad taste and nausea. Intranasal zinc may result in permanent damage to the sense
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