Key Takeaways
What Does Zinc Do in the Body?
Zinc is an essential mineral involved in hundreds of enzyme reactions. It contributes to the immune system, protein and DNA synthesis, wound healing, cell signalling, cell division, growth and development, and the sense of taste.
For most people, food should be the primary source. A supplement becomes more relevant when dietary intake is consistently low, absorption is reduced or a healthcare professional identifies an increased need.
5 Important Roles of Zinc
Normal Immune Function
Zinc contributes to normal immune processes. Extra zinc does not make immunity progressively “stronger”; maintaining adequate zinc status is the key.
Wound Healing & Skin
Zinc supports processes involved in cell division and protein synthesis. Deficiency can affect skin and delay wound healing.
Protein & DNA Synthesis
Zinc contributes to protein production, DNA synthesis and normal cell division. Adequate zinc supports these functions, but extra zinc does not automatically build more muscle.
Growth & Development
Zinc is particularly important during pregnancy, infancy, childhood and adolescence because of its role in normal growth.
Normal Taste
Zinc contributes to the normal sense of taste. Changes in taste or smell can have many causes, so they do not automatically confirm zinc deficiency.
How Much Zinc Do Adults Need?
Individual requirements can vary. During pregnancy or other periods of increased nutritional demand, supplementation should be discussed with a healthcare professional rather than automatically adding a high-dose zinc product.
Does Zinc Help With the Common Cold?
Research suggests that some oral zinc lozenges or syrups, when started soon after cold symptoms begin, may reduce how long symptoms last.
Who May Be More Likely to Need Zinc?
Which Foods Are High in Zinc?
Before reaching for a supplement, look at your diet. Oysters are particularly concentrated in zinc, while several animal and plant foods can contribute meaningful amounts.
How Much Zinc Is Too Much?
“The goal of zinc supplementation is to correct a gap—not to take the highest possible dose.”
Where Can a Zinc Supplement Fit?
If your diet or circumstances make targeted supplementation appropriate, check the label for the amount of elemental zinc, not simply the weight of the zinc compound.
QNT Zinc
QNT Zinc currently provides 22.3 mg of zinc per capsule as zinc bisglycinate, with a labelled use of one capsule per day with a meal.
Because 22.3 mg exceeds the adult RDA while remaining below the adult upper intake level, consider zinc coming from food, multivitamins and other mineral supplements before combining products.
View QNT ZincFrequently Asked Questions
What are the benefits of taking zinc supplements?
Zinc supplements can help maintain adequate zinc intake and support normal immune function, wound healing, protein and DNA synthesis, cell division, growth and taste. The benefit is most meaningful when dietary intake or zinc status is inadequate.
Is it good to take zinc every day?
Daily zinc can be appropriate when the amount fits your nutritional needs, but not everyone needs a zinc supplement. Adult requirements are around 11 mg per day for men and 8 mg per day for women, while the adult upper intake level is 40 mg per day.
What are the signs of zinc deficiency?
Possible signs can include loss of appetite, impaired growth in children, frequent infections, hair loss, changes in taste or smell, skin problems and delayed wound healing. These symptoms are not specific to zinc deficiency and should not be used for self-diagnosis.
Does zinc help you avoid getting sick?
Adequate zinc is important for normal immune function, but taking extra zinc does not guarantee that you will avoid infections. Some oral zinc lozenges may shorten an existing cold when started early, while evidence that zinc prevents colds is weak.
Can too much zinc be harmful?
Yes. Excessive zinc can cause nausea, vomiting, headaches and gastrointestinal symptoms. Long-term high intake can interfere with copper absorption and may impair immune function. The adult tolerable upper intake level is 40 mg per day unless a healthcare professional is supervising a different intake.
The Bottom Line
Zinc supplements are useful for helping maintain adequate zinc intake when food alone does not provide enough. Zinc itself is essential for immune function, wound healing, protein and DNA synthesis, cell division, growth and taste.
Start with zinc-rich foods, check whether your diet or health circumstances increase your risk of inadequate intake, and review all supplements before adding another zinc source. If you suspect deficiency, take medications that may interact with zinc, are pregnant or are considering higher doses, speak with a healthcare professional.
Sources & References
- NIH Office of Dietary Supplements — Zinc Health Professional Fact Sheet
- NIH Office of Dietary Supplements — Immune Function and Micronutrients
- NIH Office of Dietary Supplements — Pregnancy and Zinc Guidance
- Cochrane Review — Zinc for Prevention and Treatment of the Common Cold, 2024
- National Center for Complementary and Integrative Health — Zinc and the Common Cold
- QNT Sport — Zinc product information
