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Zinc and the common cold
Zinc lozenges (frequently zinc acetate or zinc gluconate) have been proposed as a treatment for the common cold. The biological mechanism of the effect is not clear, but the benefit of zinc lozenges seems to be caused by local effects in the oropharynx region, since nasal administration of zinc has also shortened the duration of colds.
Research to date has not been conclusive, but has suggested that zinc tablets lessen the symptoms of a cold while causing possible side-effects such as nausea.〔 The benefits of zinc as a cold treatment have been described as "very minor".〔
== Background ==
Zinc has been known for many years to have an effect on cold viruses in the laboratory.〔
Research into the effect of zinc lozenges on colds between 1984 and 2009 produced a wide range of differing results. It has been hypothesized that these differences were due in part to differences in the lozenges' constituents, mainly the amount of the active ingredient, ionic zinc (iZn). For example, the amount of ionic zinc ranged from 0 to 100%, depending upon the lozenge ingredients in the trials. More recently, the evidence from trials has been reviewed to try and assess the evidence of zinc's effectiveness as a cold cure but the results, while suggestive of a positive effect, have not been conclusive, since no consideration was given to the amount of the active ingredient (iZn) in the lozenges.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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