NutriStack
Zinc lozenges shorten the duration of the common cold, the receipts.
Meta-analyses (Hemilä et al.) find that zinc acetate or gluconate lozenges at 75 mg+ elemental zinc per day, started within 24 hours of symptom onset, shorten colds by about 33%.
Strong evidence, per the methodology. Strongest 6 studies linked to PubMed.
Recommendation, contrary evidence, and dose are all on this page.
The studies
Strongest evidence, sourced.
Sorted by study tier (meta-analyses first, then RCTs, then reviews) and recency. Every entry links to PubMed by PMID.
At a glance
- Substances
- Zinc, Elderberry Zinc Lozenges, Zinc Picolinate
- Evidence tier
- Strong evidence
- Strongest studies surfaced
- 6 of 14 matching
- One-line verdict
- Form, dose, and timing all matter.
- Last verified
- May 30, 2026
Top 6 studies
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Meta-analysis
Zinc for the common cold PMID 23775705
Zinc supplementation within 24 hours of cold onset reduces duration and severity
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RCT
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RCT
The Effect of Zinc Lozenge on Postoperative Sore Throat: A Prospective Randomized, Double-Blinded, Placebo-Controlled Study PMID 28953493
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RCT
Randomized study of the efficacy and safety of oral elderberry extract in the treatment of influenza A and B virus infections PMID 15080016
Symptoms were relieved on average 4 days earlier and rescue medication use was significantly less in elderberry extract group vs placebo for influenza treatment.
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RCT
Comparative absorption of zinc picolinate, zinc citrate and zinc gluconate in humans PMID 3630857
In a crossover trial of 15 healthy subjects given 50 mg elemental zinc for 4 weeks, zinc picolinate was the only form that significantly increased zinc levels in hair, urine, and erythrocytes versus placebo.
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Review
Elderberry for prevention and treatment of viral respiratory illnesses: a systematic review PMID 33827515
Systematic review found elderberry may reduce duration and severity of colds and may reduce duration of influenza, though evidence certainty is limited.
Contrary evidence
What pushes back.
Caveats, null findings, and methodological limits that hold the tier where it is.
What argues against the claim
- Oral capsules and syrups do not reproduce the lozenge effect.
- Doses below 75 mg/day or started late show no effect.
- Common side effects: nausea and unpleasant taste.
Recommendation
What the evidence supports.
What we recommend, with caveats
Zinc acetate or gluconate lozenges providing 75 to 100 mg elemental zinc/day, dissolved in the mouth (not swallowed), started within 24 hours of symptom onset. Stop after the cold resolves; do not take chronically at these doses.
Tier criteria are documented at /methodology/evidence-tiers. Sourcing standards at /methodology/interactions.
Stack interaction risks
Where these substances clash.
Documented pairings involving the substances behind this claim. Cautions and conflicts come first.
Pairs in the database
- Elderberry Zinc Lozenges + Iron · Conflict
- Iron + Zinc · Conflict
- Iron + Zinc Picolinate · Conflict
- Iron Bisglycinate + Zinc · Conflict
- Copper + Elderberry Zinc Lozenges · Caution
- Copper + Zinc · Caution
Open the free interaction checker at /interactions to scan a full routine.
Goal hubs
Where this claim feeds in.
Goal-based hubs that index this claim alongside related supplements and protocols.
Related goal hubs
Before you go
One claim, opened up. NutriStack does this for every claim in the database.
The full library lives at /research. Every entry follows the same shape: the verdict, the studies, the contrary evidence, the recommendation, and the primary literature.