For zinc nose sprays or drops to work well, they need to release a certain type of zinc that your body can use. If other ingredients in the product block this zinc, it won't work as well, and studies...
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Evidence from Studies
Supporting (1)
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Community contributions welcome
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Efficacy of Zinc Against Common Cold Viruses: An Overview
Narrative Review
2004 Sep-OctContradicting (0)
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Community contributions welcome
No contradicting evidence found
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.