Green Tea Extract
What the European Food Safety Authority and the United States National Institutes of Health have published about green tea extract 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 green tea extract 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.
EUEuropean Union — EFSA
USUnited States — NIH ODS / IOM
“None established” means that authority examined green tea extract and set no upper limit. What it published instead is below, with its own label.
Also published, and not a limit
These are the authority’s own words for a figure that is not a tolerable upper intake level. The app never compares a dose against one; this page prints it because the authority did.
To cite a figure, cite the authority’s document linked on its card, and this page as where you read it: stacky-app.com/substances/green-tea-extract, retrieved 13 November 2026. Every card has its own address: add #eu-none_established-1 to the page URL for the first one.
Products in Stacky’s catalogue containing Green Tea Extract
1 product whose label declares green tea extract, 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.
Default time of day in the app: Morning. A person can move it; the app never changes a dose.
Default food note in the app: with food.
Recorded interactions
How Stacky summarises what a named source says about green tea extract taken alongside another substance: absorption and nutrient status only. The category and the summary are Stacky’s words; each row links to the source, and the source’s own wording governs. A row without one is not published, and neither is one whose source description names a disease or clinical condition. None of these says whether a combination is good or bad.
| Stacky’s category | Summary, in Stacky’s words | Source |
|---|---|---|
| Reduces absorption or status of Iron | Flavonoids from tea bind non-heme iron and inhibit its intestinal absorption, and can also inhibit heme iron absorption. Vitamin C greatly enhances iron absorption and can counteract this effect of flavonoids. Scope the source gave: tea flavonoids consumed with a meal or with iron; one cup of tea with a meal decreased non-heme iron absorption from that meal by about 70%. |
Linus Pauling Institute Checked 6 Aug 2026 |
Indexed studies
Stacky has 5 papers indexed against green tea extract, and none of them is published here. A study reaches this page only if its own title names Green Tea Extract 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 green tea extract 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.