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Feed Science Daily: Zinc Lozenges Are Not An Effective Treatment For Colds, According to Analysis of (sciencedaily.com)

Despite twenty years of research, the benefits of zinc lozenges as a therapy for the common cold have not been proven. A new study reviews the 14 placebo-controlled studies from the past two decades and finds significant fault with 10 of the studies. Of the four remaining studies, three reported no therapeutic effect from zinc lozenge or nasal spray, and one study reported positive results from zinc nasal gel.

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