Which zinc is right for you?

What is zinc?

Zinc (Zn) is an essential trace element. The body cannot produce zinc itself and must obtain it from food or supplements. Zinc is a cofactor in 300+ enzymes and plays a role in immune function, DNA and protein synthesis, cell division, skin, and hormone regulation.

Although the body contains only about 2-3 grams of zinc (distributed throughout all tissues), the mineral is involved in an astonishingly wide range of processes. Zinc fingers — protein structures in which zinc plays a central role — are essential for reading and replicating DNA. In addition, zinc is a component of, for example, superoxide dismutase (an important antioxidant enzyme) and plays a role in the production and storage of various hormones, including insulin and testosterone.

In food, oysters are the densest source (up to 39 mg per 100 grams), followed by meat, legumes, nuts, seeds, and whole grains. Plant-based sources contain phytates which can reduce zinc absorption — this is a point of attention for vegetarians and vegans. Soaking, sprouting, and fermenting beans, grains, and seeds reduces the phytate content and improves absorption.

An important nuance in zinc supplementation: high zinc intake over a longer period (>15 mg/day for months) can lower copper status because zinc and copper compete for absorption. Premium zinc supplements therefore often add a small amount of copper (1-2 mg) to maintain balance. Also, check out our multivitamin category where this mineral balance has been systematically considered.

Zinc and EFSA — what is scientifically recognized?

Zinc has an extensive range of recognized EFSA claims, included in EU Regulation 432/2012. The following formulations may be used literally — provided the threshold is met:

"Zinc contributes to the normal functioning of the immune system."

"Zinc contributes to the maintenance of normal hair."

"Zinc contributes to the maintenance of normal nails."

"Zinc contributes to the maintenance of normal skin."

"Zinc contributes to normal DNA synthesis."

"Zinc contributes to normal protein synthesis."

"Zinc plays a role in the process of cell division."

"Zinc contributes to the maintenance of normal testosterone levels in the blood."

"Zinc contributes to normal fertility and reproduction."

"Zinc contributes to the maintenance of normal bones."

"Zinc contributes to normal vitamin A metabolism."

"Zinc contributes to the protection of cells from oxidative stress."

Threshold: claims apply with a daily intake of at least 15% of the RI — which is 1.5 mg of zinc per serving. Our products generally provide 10-25 mg per serving — well above the threshold, within the EFSA upper limit of 25 mg/day.

The zinc-copper balance — why this is important

Zinc and copper compete for absorption in the gut — a high zinc intake inhibits copper absorption, and vice versa. At common dosages (10-15 mg zinc per day), this is usually not a problem for most people, as copper is sufficiently supplied by diet.

At higher zinc dosages (>15 mg/day) over an extended period (months to years), a functional copper deficiency can occur. This can manifest as anemia, fatigue, and reduced immune function — paradoxically, the same signals some initially wanted to improve with zinc.

General guideline: for long-term zinc intake above 15 mg/day, 1-2 mg of copper per day is recommended. Many premium zinc supplements offer this combination as standard. For maintenance (10 mg), a separate copper supplement is usually not necessary. See our copper category for individual supplementation.

The forms of zinc at Plenthera

Zinc bisglycinate

Zinc bound to two glycine molecules — a chelate. High bioavailability, gentle on the stomach, and little metallic taste. An excellent choice for daily use and for people with a sensitive stomach.

Zinc picolinate

Zinc bound to picolinic acid (a natural metabolite of tryptophan). High absorption in studies, often chosen for immune and skin purposes. Is perceived by many as a fast-acting form.

Zinc gluconate

The classic form, widely studied in immune research. Good absorption, common in lozenges for local action in the throat. Cost-effective.

Zinc citrate

Zinc bound to citric acid. Good absorption, mildly laxative at higher doses. Sometimes combined with magnesium citrate in mineral formulas.

Zinc + copper (combined)

For those supplementing zinc long-term (>15 mg/day), the combined formula with 1-2 mg of copper is the logical choice. Maintains mineral balance in the long term.

How to use zinc?

Simple basic approach for zinc:

1. Determine your goal: maintenance (10 mg/day) or more intensive use (15-25 mg/day).
2. Choose the form: bisglycinate / picolinate for general use, gluconate for lozenges, combined with copper for long-term use.
3. Take zinc on an empty stomach or between meals for optimal absorption.
4. Do not take simultaneously with calcium, iron, or large amounts of coffee/tea — these can inhibit absorption.
5. For long-term use (>15 mg/day, longer than 8 weeks): ensure copper supplementation of 1-2 mg/day.
6. For stomach discomfort: take zinc with a light meal or choose bisglycinate.

Myths and misconceptions about zinc

Myth 1: "The more zinc, the stronger your immune system."

Above the recommended dosage (10 mg/day), extra zinc does not provide a proportionally stronger immune effect. Higher dosages (>25 mg/day long-term) can actually be counterproductive due to copper deficiency and/or negative effects on other minerals.

Myth 2: "Zinc and vitamin C together always work better."

Both are relevant for the immune system and are often combined, but there is no specific synergy where 1+1=3. Both contribute independently. The combination is practical and logical, not miracle-synergistic.

Myth 3: "Zinc in cosmetics works just as well as oral."

For local application on the skin (zinc ointment for wounds, zinc oxide against UV), zinc has a specific function. For systemic support of the immune system, skin, or hormone balance, oral intake is the proven route.

Myth 4: "Vegans get enough zinc from legumes and nuts."

In absolute quantities, this is sometimes true — but phytates in plant-based sources reduce absorption by 20-50%. For vegans, consciously choosing soaking/sprouting/fermenting and possibly a supplement is a logical strategy.

Combining zinc with other supplements

Zinc works within a broader mineral network. Common combinations:

• Vitamin C: classic immune combination. Both play a role in immune function and are often combined in winter formulas.
• Copper: essential for maintaining mineral balance with long-term zinc intake above 15 mg/day.
• Vitamin A: zinc supports vitamin A metabolism (EFSA claim) — both work together on skin and immunity.
• Vitamin D: for broad immune support, zinc + vitamin D is a logical duo.
• Magnesium: for general mineral balance, zinc and magnesium go well together, provided not in the same dosage (competing absorption at high mg doses).

Frequently asked questions

What is zinc?

Zinc (Zn) is an essential trace element and cofactor in 300+ enzymes. It contributes to immune function, DNA synthesis, cell division, skin, and hormone regulation.

Which zinc is best?

For absorption: bisglycinate and picolinate. For lozenges: gluconate. Oxide has low absorption and is less suitable for targeted use.

What is the difference between bisglycinate and picolinate?

Bisglycinate is bound to glycine — gentle on the stomach, high absorption. Picolinate is bound to picolinic acid — comparably high absorption, often chosen for immune/skin.

How much zinc per day?

EU-RI: 10 mg/day. For broad daily support: 10-15 mg. EFSA upper limit: 25 mg/day for adults.

When to take zinc?

On an empty stomach or between meals for optimal absorption. Do not take with calcium or iron (competing absorption).

Does zinc help with acne?

Zinc contributes to the maintenance of normal skin (EFSA claim). Clinical studies show positive effects in some forms of acne — consult a dermatologist if in doubt.

Does zinc help for hair and nails?

Zinc contributes to the maintenance of normal hair and normal nails (EFSA claims). In cases of reduced hair/nail quality due to deficiencies, supplementation can be supportive.

What are zinc deficiency symptoms?

Possible signs: frequent colds, poor wound healing, thinning hair, white spots on nails, reduced taste/smell, dry skin. No single symptom is conclusive.

Can you take zinc and copper together?

For long-term use (>15 mg zinc/day), a copper supplement (1-2 mg) is recommended to maintain balance. Many premium zinc supplements offer this combination as standard.

Can you use zinc for a long time?

Below 15 mg/day, long-term use is generally safe. Above that dosage: consider copper supplementation. If in doubt: have 25(OH)D, ferritin, and zinc/copper status measured and discuss with a therapist.

Sources

• EFSA Regulation (EU) 432/2012 — zinc claims.
• EFSA NDA Panel — Scientific Opinion on Tolerable Upper Intake Level for zinc (2014).
• Wessels I. et al., "Zinc as a Gatekeeper of Immune Function", Nutrients (2017).
• Solomons NW., "Update on zinc biology", Ann Nutr Metab (2013).
• USDA FoodData Central — zinc content food database.
• WHO/FAO — Vitamin and Mineral Requirements in Human Nutrition (2nd ed., 2004).