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Zinc

An essential trace mineral with good evidence for immune support — most people get enough from food, but certain groups benefit from supplementation.

By editorialUpdated 2026-05-251 min read

What it's actually good for

Zinc is an essential trace mineral involved in immune cell development, wound healing, and protein synthesis. Most people eating a varied diet get adequate zinc, but vegetarians, older adults, and people with GI conditions may fall short. The strongest supplementation case is for immune support, particularly around common colds.

What the research says

Immune support and colds (Grade B). A 2013 Cochrane review found that zinc lozenges or syrup, started within 24 hours of cold symptom onset, reduced cold duration by about a day. Daily zinc supplementation supports normal immune cell function, with the most benefit seen in people with marginal zinc status. The evidence is solid but not quite Grade A because optimal dosing, form, and population vary across studies.

Claim-by-claim

Each claim graded independently

The overall grade is the floor. Some claims are stronger or weaker than the headline.

B

Supports immune function and may reduce cold duration

Meta-analyses show zinc lozenges can reduce cold duration by 1-2 days when started early; daily supplementation supports immune cell function, especially in those with low zinc status.

Sources

2 cited
[01]METAZinc for the common coldSingh M, Das RR. Cochrane Database Syst Rev. 2013
[02]GOVTZinc — Fact Sheet for Health ProfessionalsNIH Office of Dietary Supplements. 2022

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Medical disclaimer. The information on this site is provided for educational purposes only and is not intended as medical advice. It does not constitute a diagnosis, treatment plan, or recommendation for any specific health condition. Always consult a qualified healthcare professional before making changes to your supplement regimen, diet, or lifestyle — especially if you are pregnant, nursing, taking medications, or managing a medical condition.

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