Zinc
settled zinc — established for cold duration at the right dose and timing
Evidence by outcome
cold preventiongrade Bmoderate certainty— zinc lozenges started early may modestly shorten cold duration
immune functiongrade Clow certainty— supplementation helps mainly when intake is deficient
People say · Evidence shows
“Zinc cures colds”
aheadmodestfolk
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sources: PMID:00000023 · PMID:00000024