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Zinc

Also known as: Zn, Zinc picolinate, Zinc gluconate, Zinc oxide

An essential trace mineral for immunity, skin, and wound healing, found in supplement and skincare routines alike.

A zinc-bearing mineral specimen with salts and a plain tablet
Editorial illustration

Zinc is an essential mineral whose clearest benefit is correcting deficiency. Some lozenge regimens may shorten a cold and zinc may help selected acne outcomes, but form, dose, timing, and toxicity matter; long-term high-dose use can cause copper deficiency.1, 2

  • Required by hundreds of enzymes; cannot be stored long-term in the body1, 2
  • Richest food source: oysters; also in beef, poultry, beans, nuts1, 2
  • Recommended intake: 11 mg daily for men, 8 mg for women1, 2
  • Upper limit: 40 mg per day for adults1, 2

What is Zinc?

Zinc is the second most abundant trace mineral in the body after iron. It is a structural component of hundreds of proteins and a catalytic helper in many more, and it is essential for immune cell development, DNA synthesis, and skin repair. Because the body has no long-term zinc storage, a steady dietary supply matters. Mild deficiency affects immune function and skin healing, and zinc supplements are among the most widely used in the United States.1

Where it comes from

Natural sources

  • Oysters (by far the richest source)
  • Beef, pork, and poultry
  • Beans, nuts, and whole grains (phytates reduce absorption)
  • Fortified breakfast cereals

How it's made

Supplemental zinc is produced chemically and bound to carriers like gluconate, picolinate, or citrate.

What it does in products

  • Immune cell development and function
  • Wound healing and skin repair
  • Protein and DNA synthesis
  • Oil regulation and anti-inflammatory action in skincare
  • UV protection as zinc oxide in sunscreens

Benefits

Correcting deficiency

strong evidence

Zinc deficiency impairs immune function, appetite, and wound healing. Supplementation quickly restores zinc status in people with low intake — common in vegetarians and older adults.1

Zinc is essential and replacement corrects deficiency; routine high-dose supplementation in zinc-replete people is not the same intervention.

Shorter colds (lozenges)

moderate evidence

Zinc lozenges taken within 24 hours of cold symptoms shorten the average cold by roughly one to two days in meta-analyses, with doses of 75–100 mg per day used short-term during illness.2, 1

Some lozenge regimens shorten colds when started early, but dose, salt, formulation, outcome reporting, and adverse effects vary substantially.

Acne support

moderate evidence

Oral zinc (30–150 mg daily in trials, usually 30–45 mg) and topical zinc both show anti-inflammatory benefits in acne, though the effect is smaller than with standard prescription treatments.3

The meta-analysis found a signal for zinc treatment, but trials were heterogeneous and zinc is not established as a replacement for standard acne therapy.

Skin barrier and healing

strong evidence

Zinc is essential for skin repair and is included in barrier creams and diaper ointments; zinc oxide also protects and soothes irritated skin.1

Zinc has an established physiologic role in skin integrity and wound healing; benefits from extra zinc are clearest when intake or status is inadequate.

Evidence scope and limitations

The review separates correction of zinc deficiency, short-term zinc lozenges for colds, acne studies, and zinc's normal role in skin integrity.

  • Zinc salt, dose, lozenge composition, and timing make cold-trial results difficult to generalize.
  • Long-term high-dose zinc can cause copper deficiency; intranasal zinc is excluded because of smell-loss risk.

Evidence last checked: 2026-09-26

Side effects & safety

Nausea on an empty stomach (common)Taking zinc with food usually eliminates this.
Metallic taste (uncommon)Most common with zinc lozenges.
Copper deficiency with long-term high doses (rare)Doses above 40 mg daily over months can deplete copper; many formulas pair zinc with 1–2 mg copper.

Safety considerations

  • The pregnancy RDA is 11 mg daily. Zinc is a standard component of prenatal vitamins and is safe within recommended amounts.
  • Zinc competes with copper for absorption — long-term use above the 40 mg upper limit can cause copper deficiency.
  • Certain antibiotics (tetracyclines, quinolones) bind zinc; take them 2 hours apart.
  • High-dose zinc can reduce the absorption of iron.
  • Not for: Wilson disease (an inherited copper-handling disorder)
1, 2

Amounts studied & product use

These figures describe research or common product use, not a personal dose or treatment recommendation.

In supplement studies and products

The U.S. RDA is 11 mg daily for adult men and 8 mg for adult women; the adult upper limit is 40 mg. Cold-lozenge trials use short-term, formulation-specific elemental-zinc exposures that should not be converted into a long-term daily regimen.

In skincare studies and products

Topical zinc salts and zinc oxide sunscreens serve different functions and use different concentrations. Evidence for an oral lozenge, a zinc PCA cosmetic, and zinc oxide UV protection cannot be transferred between routes.

1, 2

Regulatory status

  • Dietary supplement under DSHEA. Zinc oxide is an FDA-approved OTC skin protectant and sunscreen active ingredient under the FDA OTC monograph system.
  • GRAS (generally recognized as safe) for food use.
  • INCI name on cosmetic labels: Zinc (as zinc oxide, zinc PCA, zinc sulfate, or zinc gluconate in cosmetics).
4

Zinc in supplements vs zinc in skincare

Zinc plays two different roles depending on the product. Orally, it supports immune and skin function from the inside. Topically, zinc compounds are used for their soothing, anti-inflammatory, and mildly astringent properties in acne serums and barrier creams. The two uses are complementary — oral zinc for systemic support, topical zinc for local oil control and protection — but topical zinc does not raise body zinc levels.

1

Frequently asked questions

What is the best zinc supplement form?

Picolinate, gluconate, and citrate are all well absorbed and gentler than oxide or sulfate. For most people, any of the well-absorbed forms at 15–30 mg daily is a good choice; oxide is fine in lozenges and cheaper products but is absorbed less efficiently.1, 2

Can I take zinc every day?

Yes, at doses within the 40 mg upper limit. If you take zinc long-term at the higher end of the range, choose a formula that includes copper or ensure copper from food, since high zinc intake can deplete copper.1, 2

Does zinc really shorten colds?

The evidence says yes, modestly: zinc lozenges started within 24 hours of the first symptoms shorten colds by roughly one to two days in pooled analyses. The effect depends on the form (zinc acetate or gluconate lozenges) and consistent dosing throughout the day.1, 2

The bottom line

Zinc is valuable when the indication and formulation are specific. Avoid converting short-term lozenge or deficiency evidence into a case for continuous high-dose supplementation.

References

  1. Zinc: Health Professional Fact Sheet. NIH Office of Dietary Supplements (2025) · government guidance
  2. Zinc for the common cold. Cochrane Database of Systematic Reviews (2017) · systematic review · PMID 28121579
  3. Serum zinc levels and efficacy of zinc treatment in acne vulgaris: a systematic review and meta-analysis. Dermatologic Therapy (2020) · meta analysis · PMID 32860489
  4. Dietary Supplements. U.S. Food and Drug Administration (2025) · government guidance

Revision history

  1. Replaced search-result citations with exact sources, mapped claims to evidence, and reassessed evidence strength.