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meta analysis575 participants

Zinc Lozenges and Colds: A Seven-Trial Meta-Analysis

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A seven-trial meta-analysis found cold duration was 33% shorter on average with zinc lozenges providing more than 75...

A seven-trial meta-analysis found cold duration was 33% shorter on average with zinc lozenges providing more than 75 mg/day (95% CI 21%-45%). Acetate and gluconate did not differ significantly, and doses above 100 mg/day did not show greater efficacy. These short-term lozenge doses are distinct from routine dietary zinc needs.

Key Findings

  • Seven randomized trials included 575 participants with naturally acquired colds.
  • Cold duration was 33% shorter in zinc groups on average (95% CI 21%-45%).
  • Acetate trials showed a 40% reduction and gluconate trials 28%, but the difference between salts was not significant.
  • Five trials using 80–92 mg/day and two using 192–207 mg/day had similar pooled effects; the review found no evidence of greater efficacy above 100 mg/day.
  • The review concerns short-term cold treatment with lozenges. It does not establish that ordinary swallowed zinc supplements prevent colds or that children should follow these regimens.

Study Details

Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage
Hemilä H — JRSM Open (2017)
Seven trials found a mean 33% shorter cold duration. Differences between acetate and gluconate, and between lower and higher studied doses, were not significant.
575 participantsModerate

Practical Takeaway

The result applies to specific lozenge trials rather than routine high-dose zinc use. Short-term cold-treatment doses exceed ordinary nutritional requirements, so discuss suitability and duration with a clinician or pharmacist. Do not turn a research dose into a long-term daily regimen.

Summary

A 2017 meta-analysis of seven trials and 575 participants evaluated zinc lozenges providing more than 75 mg/day of elemental zinc for naturally acquired colds.

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Frequently Asked Questions

Does zinc shorten a cold?

This meta-analysis found a shorter average cold duration with the studied high-dose lozenges. Product composition and treatment conditions matter, so the result does not apply automatically to every zinc product.

Is zinc acetate better than gluconate?

The pooled difference between the two salts was not statistically significant. The review concluded that suitably composed gluconate lozenges may be as effective as acetate.

Should I take more than 100 mg of zinc daily for a cold?

The review found no evidence that doses above 100 mg/day added benefit. Its trials do not justify escalating a dose or using high-dose zinc long term.

Are cold-treatment doses the same as daily zinc needs?

No. The lozenge trials used short-term doses above routine dietary requirements. Daily supplementation should address an individual nutritional need, not reproduce a cold-treatment trial indefinitely.

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Supplement Guide

Zinc

Zinc is essential, but extra intake is not routine cold prevention. Treatment may shorten colds with uncertain benefit and more adverse effects; avoid prolonged high doses.

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References

  1. Hemilä H (2017). Zinc lozenges and the common cold: a meta-analysis comparing zinc acetate and zinc gluconate, and the role of zinc dosage. Journal of the Royal Society of Medicine Open. DOI PubMed
  2. Wessels I, Maywald M, Rink L (2017). Zinc as a Gatekeeper of Immune Function. Nutrients. DOI PubMed