Minerals

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.

By IngredientWiki Editorial Team
Fact-checked by IngredientWiki Editorial Team
Updated 2026-09-25
3 min read

In short

Zinc is an essential trace mineral required by hundreds of enzymes involved in immune function, protein synthesis, wound healing, and cell division. It is found in foods like oysters, beef, and beans, and in supplements as gluconate, picolinate, or citrate. In skincare, zinc appears in anti-acne and barrier-support formulas, while zinc oxide is the main physical sunscreen filter.

Required by hundreds of enzymes; cannot be stored long-term in the body
Richest food source: oysters; also in beef, poultry, beans, nuts
Recommended intake: 11 mg daily for men, 8 mg for women
Upper limit: 40 mg per day for adults

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.

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

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.

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.

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.

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.

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)

How it's used

In supplements

The RDA is 11 mg for men and 8 mg for women. Daily supplements typically provide 15–30 mg; the adult upper limit is 40 mg. Lozenges for colds are used short-term at 75–100 mg per day, split throughout the day.

In skincare

Topical zinc in skincare typically appears at 0.5–2% (zinc PCA, zinc sulfate) in anti-acne and soothing formulas. Zinc oxide sunscreens use 10–25% concentrations.

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).

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.

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.

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.

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.

The bottom line

Zinc is an essential mineral with real roles in immunity, skin, and wound healing. Daily supplements at 15–30 mg support adequate intake, lozenges can modestly shorten colds when used early, and topical zinc has a long history of use in acne and barrier skincare. Keep total intake below 40 mg per day unless directed otherwise.

References

Zinc — Health Professional Fact Sheet. NIH Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/Zinc-HealthProfessional/
Zinc — Consumer Fact Sheet. NIH Office of Dietary Supplements. https://ods.od.nih.gov/factsheets/Zinc-Consumer/
Zinc compound summary. PubChem (National Library of Medicine). https://pubchem.ncbi.nlm.nih.gov/compound/23994
Zinc for the common cold (Cochrane review). Cochrane Database of Systematic Reviews. https://pubmed.ncbi.nlm.nih.gov/28121579/