Vitamin K2
What the European Food Safety Authority and the United States National Institutes of Health have published about vitamin K2 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 vitamin K2 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
Applies to one chemical form only: EFSA's vitamin K AI is based on phylloquinone (vitamin K1) ONLY; no separate reference value exists for menaquinones (vitamin K2) EUEFSA
USUnited States — NIH ODS / IOM
Applies to one chemical form only: IOM/NASEM vitamin K AI is based on phylloquinone (K1); no separate value for K2 USNIH ODS
Applies to one chemical form only: IOM/NASEM vitamin K AI is based on phylloquinone (K1); no separate value for K2 USNIH ODS
“None established” means that authority examined vitamin K2 and set no figure. A substance for which Stacky holds no published reference has no row here, and no page.
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/vitamin-k2, retrieved 13 November 2026. Every card has its own address: add #eu-ai-1 to the page URL for the first one.
Products in Stacky’s catalogue containing Vitamin K2
10 products whose label declares vitamin K2, 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 food note in the app: with food.
Recorded interactions
How Stacky summarises what a named source says about vitamin K2 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: 1 such row for Vitamin K2 stays in the app. None of these says whether a combination is good or bad.
| Stacky’s category | Summary, in Stacky’s words | Source |
|---|---|---|
| Documented relationship with Vitamin A | Large doses of vitamin A have been found to antagonise vitamin K, apparently by interfering with vitamin K absorption. Scope the source gave: large doses of vitamin A. |
Linus Pauling Institute Checked 6 Aug 2026 |
| Documented relationship with Vitamin E | Large doses of vitamin E antagonise vitamin K, apparently by inhibiting vitamin K-dependent carboxylase activity. In adults with normal coagulation status, 1,000 IU a day of vitamin E for 12 weeks decreased carboxylation of prothrombin, a vitamin K-dependent protein. Scope the source gave: large doses of vitamin E; one study used 1,000 IU a day for 12 weeks. |
Linus Pauling Institute Checked 6 Aug 2026 |
Indexed studies
Stacky has 5 papers indexed against vitamin K2, and none of them is published here. A study reaches this page only if its own title names Vitamin K2 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 vitamin K2 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.