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The latest study of zinc as a cold remedy found that between 75 and 100 mg daily, in zinc acetate lozenges, reduced the length of a cold by nearly 3 days—close to half the 7-day average. The study, which compared a placebo and zinc lozenges among 199 people with colds, was published in the British Journal of Clinical Pharmacology. It found comparable benefits among men and women of all ages.