Substrate
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evidence-based
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What to take for cold prevention
Graded by the strength of the evidence — strongest first. Nothing here is sold to you.
Zinc
grade B
— zinc lozenges started early may modestly shorten cold duration
Zinc
grade C
— zinc lozenges started early may shorten common-cold duration
Vitamin C
studied, no effect
— no reduction in cold incidence in the general population