: What's the optimal dosage of zinc within 24 hours of onset of cold symptoms? A cochrane review suggested that taking zinc within onset of cold symptoms is effective at lingering the common cold. What's the optimal dosage?

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As the study says:

Zinc administered within 24 hours of onset of symptoms reduces the
duration of common cold symptoms in healthy people but some caution is
needed due to the heterogeneity of the data. As the zinc lozenges
formulation has been widely studied and there is a significant
reduction in the duration of cold at a dose of ? 75 mg/day

Examine.com states;

Superloading zinc by taking up to 100mg zinc a day is confirmed to be
safe in the short term (2-4 months), but because this dose is higher
than the 40mg Tolerable Upper Limit (TUL) of zinc, prolonged
superloading is not advised.

However, as can be seen in the PubMed comments here there are significant criticisms of the summary made. This lead to the withdrawal of the publication in 2015
Zinc Supplementation Decreases Incidence Of Infections In The Elderly: Effect Of Zinc On Generation Of Cytokines And Oxidative Stress found:

Supplementation of 45mg elemental zinc for a period of 12 months in
elderly persons who had low baseline zinc levels, the infection rate
seen with supplementation (29%) was lower than placebo (88%) although
upper respiratory tract infection rates trended to be less common (50%
reduction) but this failed to reach significance.

In summary:
The 2013 Cochrane study was trashed by one reviewer and got taken down. There is no significant evidence that it reduces the common cold symptoms in adults if taken as one is starting.