NutriStack
Zinc supports immune function, the receipts.
Adequate zinc status is required for normal immune function. Supplementation reliably improves immune markers in deficient individuals; benefits in zinc-replete adults are smaller.
Moderate 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, Zinc Picolinate
- Evidence tier
- Moderate evidence
- Strongest studies surfaced
- 6 of 6 matching
- One-line verdict
- Necessary nutrient, not a generic immune booster.
- Last verified
- May 30, 2026
Top 6 studies
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Review
Role of zinc in health and disease PMID 38367035
Comprehensive review of zinc's role in immune function, showing zinc is critical for innate and adaptive immunity, with deficiency leading to decreased natural killer cell activity and thymulin levels.
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Review
Zinc Intakes and Health Outcomes: An Umbrella Review PMID 35211497
Umbrella review of zinc health outcomes covering immune function, wound healing, and metabolic effects across multiple meta-analyses
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Review
Zinc in Wound Healing Modulation PMID 29295546
Zinc is a cofactor for numerous metalloenzymes required for cell membrane repair, cell proliferation, growth and immune system function in wound healing
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Review
Zinc requirements and the risks and benefits of zinc supplementation PMID 16632171
At 100-300 mg Zn/day, copper deficiency with anemia, neutropenia, and impaired immune function has been reported
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Meta-analysis
Zinc supplementation and immune factors in adults: a systematic review and meta-analysis of randomized clinical trials PMID 33356467
Zinc supplementation significantly reduced CRP and increased CD4 levels across 35 RCTs with 1995 participants
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Meta-analysis
Zinc supplementation during pregnancy reduced preterm birth risk and improved birth outcomes, particularly in low- and middle-income settings.
Contrary evidence
What pushes back.
Caveats, null findings, and methodological limits that hold the tier where it is.
What argues against the claim
- Chronic high-dose zinc causes copper deficiency, anemia, and neutropenia.
- Most immune benefits accrue in deficient populations.
Recommendation
What the evidence supports.
What we recommend, with caveats
15 to 30 mg/day for short-term immune support during illness. For long-term daily use, stay at or below 15 mg/day and pair with copper to avoid depletion.
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
- Iron + Zinc · Conflict
- Iron + Zinc Picolinate · Conflict
- Iron Bisglycinate + Zinc · Conflict
- Copper + Zinc · Caution
- Copper + Zinc Picolinate · Caution
- Enalapril + 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.