Zinc
What the European Food Safety Authority and the United States National Institutes of Health have published about zinc intake, and what the catalogue records. Reference figures and citations only.
Stacky is an organisational tool, not a medical device. It does not provide medical advice, and nothing on this page says what zinc does. Talk to a doctor or pharmacist before starting, stopping or changing what you take.
Published intake references
Each figure is one authority’s published value, with the kind of figure and the people it applies to as that authority stated them. Where the EU and the US differ, both are shown and neither is averaged or converted. Only a tolerable upper intake level sets a ceiling. A recommended or adequate intake is context, not a limit.
European Union — EFSA
United States — NIH ODS / IOM
Forms of zinc with their own page
The figures above are set on zinc, the element. A supplement label may declare the element or the whole salt, and the element is a different fraction of each salt’s weight. Each form’s page shows that fraction and reads the label conventions.
Products in Stacky’s catalogue containing Zinc
23 products whose label declares zinc, listed by brand and drawn as the app draws them. Amounts are the manufacturer’s printed figures; Stacky has measured nothing and ranks nothing.
How it is recorded
What the app records so it can schedule a dose. None of it is advice.
Forms recorded: Capsule.
Food: the app records zinc as taken with food.
Recorded interactions
What a named source says about zinc taken alongside another substance: absorption and nutrient status only. Each row links to its source. A row without one is not published, and neither is one whose source description names a disease or clinical condition: 1 such row for Zinc stays in the app. None of these says whether a combination is good or bad.
| Relationship | What the source says | Source |
|---|---|---|
| Reduces absorption or status of Copper | Zinc at 50 mg a day or more, taken over weeks, interferes with copper absorption and can lower copper status. Reductions in a marker of copper status have been reported at intakes of about 60 mg a day for up to 10 weeks. Scope the source gave: 50 mg a day or more, taken over a period of weeks. |
NIH ODS Checked 6 Aug 2026 |
| Documented relationship with Iron | Supplements containing 25 mg or more of elemental iron taken at the same time as zinc can reduce zinc absorption and plasma zinc concentrations. Iron used to fortify foods does not significantly interfere with zinc absorption. Scope the source gave: supplements containing 25 mg elemental iron or more, taken at the same time as zinc; iron added to fortified foods does not have this effect. |
NIH ODS Checked 6 Aug 2026 |
| Reduces absorption or status of Magnesium | One study found that zinc supplements at 142 mg a day interfered with magnesium absorption and disrupted magnesium balance. That intake is well above the tolerable upper intake level for zinc. Scope the source gave: 142 mg a day of supplemental zinc (single study in healthy adult males). |
NIH ODS Checked 6 Aug 2026 |
| Increases absorption or status of Vitamin B9 | The bioavailability of dietary folate depends on a zinc-dependent enzyme, and some studies found that low zinc intake decreased folate absorption. The reverse effect of folic acid on zinc has been suggested but was not seen in a study giving 800 mcg a day of folic acid to people on a low-zinc diet. | Linus Pauling Institute Checked 6 Aug 2026 |
Indexed studies
Stacky has 5 papers indexed against zinc, and none of them is published here. A study reaches this page only if its own title names Zinc and does not name a disease or clinical condition. None of the 5 passes that rule. They remain in the app. How this list is built →
About this page
Stacky is a supplement tracking app. It renders what you take and what published sources say about it; it does not tell you what to take. Every figure on this page names the authority that published it and links to that authority’s own page.
Not on this page: a dose of our own, a grade, a verdict on whether zinc works, or any statement that it treats, prevents or improves a condition. How these pages are built →
Figures are read from the authorities’ published tables and can go out of date when those tables are revised. If one here is wrong, tell us at support@stacky-app.com and we will check it against the source.