Zinc for Viral Load Reduction
Zinc supports immune competence but has no demonstrated effect on viral load.
Overview
Verdict
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 15-30mg/day if deficient
- Expected timeframe
- 8-12 weeks
Protocol
- form
- Zinc gluconate or sulfate; lozenges act locally in the oropharynx rather than systemically
- duration
- Trials ran 5-21 days in acute illness
- co factor
- Evidence is insufficient. Zinc ions inhibit RNA-dependent RNA polymerase in several viruses in cell culture, and zinc lozenges shorten common cold duration - a local epithelial effect on rhinovirus rather than a demonstrated reduction in systemic viral load. In COVID-19, the COVID A to Z randomised trial of high-dose zinc found no reduction in symptom duration, and other trials and meta-analyses have not shown viral clearance benefit. In HIV, zinc supplementation in deficient patients improved some immune parameters but did not reduce viral load.
- titration
- Not applicable. The tolerable upper intake level is 40 mg/day, and the higher trial doses were strictly time-limited
- starting dose
- Not established. Trials in respiratory viral illness used 30-100 mg/day of elemental zinc, sometimes with ionophores such as hydroxychloroquine or quercetin
Evidence
What the studies say
Randomized controlled clinical trial of zinc supplementation in HIV-1 infected adults
Baum MK, Lai S, Sales S +2 more
Zinc preserved CD4 counts but did not significantly lower HIV viral load.
Safety
Caveats
Does not replace antiviral therapy. High doses cause copper deficiency.
Less likely to help if
Medical Disclaimer
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