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This is a mixed bag, with more studies showing no benefit. We await further research. In the meantime, probiotics seem to have a more robust effect in ear infection prevention.
1. Gulani A, Sachdev HS. Zinc supplements for preventing otitis media. Cochrane Database of Systematic Reviews 2014, Issue 6. Art. No.: CD006639. DOI: 10.1002/14651858.CD006639.pub4.