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ingestible · for immune support

Zinc (supplemental, immune-support dose)

Reviewed by the Nimbera editorial team · Last updated May 2026

Wessels, Maywald & Rink (2017, Nutrients, PMID 29186856) reviewed how zinc ions regulate intracellular signalling in both innate and adaptive immune cells via Toll-like receptor and T-cell receptor pathways. Gombart, Pierre & Maggini (2020, Nutrients, PMID 31963293) identified zinc among the micronutrients with the strongest evidence for immune support, noting that adequate intake is essential at every stage of the immune response.$6-$18 for a 3-month supply at 15 mg/day.

How to use

Take 8-11 mg of zinc daily (the RDA) from diet or a standard multivitamin. If supplementing separately, 15-25 mg elemental zinc daily is commonly used for immune support. Take with food to reduce stomach upset. Do not exceed 40 mg/day (the adult tolerable upper intake level).

How it works

Zinc is required for the development and function of neutrophils, natural killer cells, and T-lymphocytes. It acts as a structural cofactor for hundreds of enzymes and controls inflammatory signalling pathways. Deficiency impairs immune cell maturation and increases susceptibility to infection.

Where to buy

Pharmacies and health food stores. Zinc gluconate, zinc citrate, and zinc picolinate forms are generally well tolerated. Zinc oxide has lower bioavailability.

Typical cost: $6-$18 for a 3-month supply at 15 mg/day.

Safety notes

Long-term supplementation above 40 mg/day can inhibit copper absorption, reduce HDL cholesterol, and paradoxically impair immune function. Do not combine high-dose zinc with zinc-containing lozenges or other zinc supplements on the same day. Zinc can interact with certain antibiotics (quinolones, tetracyclines) and reduce their absorption.

Drug & supplement interactions

  • Always tell your doctor or pharmacist about any supplements you take.
  • Interactions can occur with prescription medications, blood thinners, and immunosuppressants.
  • Herbal remedies can affect how the body absorbs or metabolises drugs.
  • Check drugs.com interactions checker before starting.

Clinical source

Wessels I, Maywald M & Rink L, Zinc as a Gatekeeper of Immune Function, Nutrients, 2017

This information is compiled from primary clinical literature and is for informational purposes only. It is not a substitute for professional medical advice. Read our full disclaimer.