Skip to content
← All supplements
Zinc
The Immunity Mineral

Zinc

Zn (Various Forms)

Key Benefits

Immune Function

Essential for T-cell development and function. Reduces duration of colds when taken early.

Wound Healing

Required for cell division and protein synthesis during tissue repair.

Testosterone Support

Supports healthy testosterone levels and reproductive function.

auto_awesome

Activation Synergies

recommended Vitamin C

Vitamin C and zinc work synergistically for immune support, particularly effective when taken together during illness.

recommended Magnesium

Both minerals support immune function and enzyme activity. Balanced intake prevents competitive absorption issues.

Recommended Dosage

medical_services
15-30 mg / daily

Take with food to reduce nausea. Zinc picolinate and gluconate absorb better than oxide. Long-term high doses can interfere with copper absorption.

warning

Deficiency Indicators

  • Frequent infections
  • Hair loss
  • Loss of taste or smell
  • Slow wound healing
  • White spots on nails
verified

Scientific Citations

NIH Office of Dietary Supplements open_in_new

Zinc Fact Sheet

Forms & absorption

science

Not all forms absorb equally — these are ordered best-absorbed first.

  • Zinc picolinate trending_up Well absorbed · best for Everyday supplementation

    Chelated with picolinic acid; among the best-absorbed zinc forms.

  • Zinc citrate trending_up Well absorbed

    Well absorbed with a more neutral taste.

  • Zinc gluconate trending_flat Moderate · best for Cold-season lozenges

    Common in lozenges; decent absorption.

  • Zinc oxide trending_down Poorly absorbed

    Cheap and common in low-cost products, but poorly absorbed.

Absorption varies between people; informational only, not medical advice.

Research & Sources

What the evidence says — with links to the original studies

Consensus: widespread

Zinc is an essential trace mineral with well-established roles in immune function, enzyme catalysis, protein synthesis, and wound healing, and its RDA and Tolerable Upper Intake Level (40 mg/day for adults) are set by authoritative bodies (NIH ODS, EFSA). Evidence that zinc lozenges taken at cold onset shorten cold duration is supported by multiple meta-analyses, but the 2024 Cochrane review rated the evidence low-certainty and inconclusive, so this specific application is best described as promising-but-unsettled within an overall widespread consensus on zinc's essentiality. Bioavailability differs modestly by chemical form (organic salts such as gluconate, citrate, glycinate and picolinate generally absorb better than oxide), though head-to-head human data are limited and heterogeneous. High supplemental doses (>=50 mg/day for weeks) can induce copper deficiency and impair immune function.

check_circle

Supporting Evidence

Zinc: Fact Sheet for Health Professionals
Government fact sheet NIH Office of Dietary Supplements (ODS)

RDA 11 mg/day men, 8 mg/day women; UL 40 mg/day for adults. States doses of 50 mg or more over weeks can inhibit copper absorption, reduce immune function, and lower HDL. Notes absorption ~61% for citrate/gluconate vs ~50% for oxide; zinc may reduce cold duration but not severity.

Scientific Opinion on Dietary Reference Values for zinc (EFSA NDA Panel) verified
Regulatory scientific opinion EFSA Journal, 2014

EFSA sets zinc Population Reference Intakes that scale with dietary phytate (300-1200 mg/day): roughly 7.5-12.7 mg/day for women and 9.4-16.3 mg/day for men. Phytate is the key inhibitor of zinc bioavailability.

Zinc for prevention and treatment of the common cold (2024 Cochrane Review; Nault et al.) verified
Cochrane systematic review Cochrane Database of Systematic Reviews, 2024

34 trials. Low-certainty evidence that zinc may reduce cold duration by ~2 days; no clear evidence for preventing colds or reducing severity. Authors call the evidence inconclusive due to heterogeneity in zinc type, dose, and outcome measurement.

Hemila — Zinc lozenges and the common cold: meta-analysis (acetate vs gluconate, dosage) verified
Meta-analysis JRSM Open, 2017

Seven RCTs (575 participants): zinc lozenges reduced cold duration by 33% (95% CI 21-45%). Acetate 40% vs gluconate 28% (difference not significant). Doses above ~100 mg/day showed no added benefit.

Hemila et al. — Zinc Acetate Lozenges May Improve Recovery Rate: Individual Patient Data Meta-Analysis verified
Individual patient data meta-analysis Open Forum Infectious Diseases, 2017

Pooled 3 double-blind placebo-controlled trials (199 patients). Zinc acetate lozenges (80-92 mg/day) sped recovery, rate ratio 3.1 (95% CI 2.1-4.7); by day 5, 70% of zinc vs 27% of placebo patients recovered (NNT 2.3).

Devarshi et al. — Comparative Absorption and Bioavailability of Various Chemical Forms of Zinc verified
Narrative review (open access) Nutrients, 2024

Concludes zinc glycinate and gluconate are better absorbed than other forms; oxide and sulfate rank lower; picolinate evidence mixed. Emphasizes heterogeneous designs and small samples limit definitive rankings.

info

Opposing / Critical Views

2024 Cochrane Review — cold-duration benefit rated low-certainty, prevention benefit absent verified
Cochrane systematic review Cochrane Database of Systematic Reviews, 2024

Counterweight to positive lozenge meta-analyses: rates the cold-duration benefit as low-certainty, finds no prevention benefit. Note an earlier 2011/2013 Cochrane review (Singh & Das) was withdrawn in 2015 over data-integrity concerns.

picture_as_pdf

Full-text & official documents

Educational summary of published research — not medical advice. Consult a qualified professional before supplementing.

groups

Have You Tried This?

Join our collective laboratory. Share your experience level with this topic and help others gauge the journey.

Based on .

No one has shared yet. Be the first to place a pin on the map.

check_circle You marked yourself as .

Status: In Your Stack Status: Not in Stack