Lifeextension cites this https://pubmed.ncbi.nlm.nih.gov/24715076/ claiming “The results showed that when the proper dose of zinc is used within 24 hours of first symptoms, the duration of cold miseries is cut by about 50%” I’d be interested if you do a dig through the citation chain. The lifeextension page has a number of further links.
Looks like they plagiarized from this paper, which found:
Results: Thirteen placebo-controlled comparisons have examined the therapeutic effect of zinc lozenges on common cold episodes of natural origin. Five of the trials used a total daily zinc dose of less than 75 mg and uniformly found no effect. Three trials used zinc acetate in daily doses of over 75 mg, the pooled result indicating a 42% reduction in the duration of colds (95% CI: 35% to 48%). Five trials used zinc salts other than acetate in daily doses of over 75 mg, the pooled result indicating a 20% reduction in the duration of colds (95% CI: 12% to 28%).
Is there a meta-analysis studying the effect size of this intervention? These seem unrealistically high to me.
Lifeextension cites this https://pubmed.ncbi.nlm.nih.gov/24715076/ claiming “The results showed that when the proper dose of zinc is used within 24 hours of first symptoms, the duration of cold miseries is cut by about 50%” I’d be interested if you do a dig through the citation chain. The lifeextension page has a number of further links.
That citation is retracted?
Here’s the Cochrane withdrawal notice.
Looks like they plagiarized from this paper, which found:
Good catch, thanks.