Vitamin A
What the European Food Safety Authority and the United States National Institutes of Health have published about vitamin A 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 A 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
Unit: 1 µg RE = 1 µg retinol = 6 µg beta-carotene = 12 µg other provitamin A carotenoids. NOTE: EFSA's RE differs from the us rae system (which uses 12 µg beta-carotene = 1 µg RAE); EU and US vitamin A figures are not directly interchangeable. EUEFSA
Unit: 1 µg RE = 1 µg retinol = 6 µg beta-carotene = 12 µg other provitamin A carotenoids. NOTE: EFSA's RE differs from the us rae system (which uses 12 µg beta-carotene = 1 µg RAE); EU and US vitamin A figures are not directly interchangeable. EUEFSA
Unit: PREFORMED vitamin A only, i.e. retinol and retinyl esters; the UL does not apply to provitamin A carotenoids such as beta-carotene. Published in µg RE, not iu. Label conversion: 1 IU = 0.3 µg retinol, so the 3,000 µg UL equals 10,000 IU. EUEFSA
USUnited States — NIH ODS / IOM
Unit: RAE (retinol activity equivalents): 1 µg RAE = 1 µg retinol = 2 µg SUPPLEMENTAL beta-carotene = 12 µg DIETARY beta-carotene = 24 µg dietary alpha-carotene or beta-cryptoxanthin. Published in µg RAE, not iu; the label factor is 1 IU = 0.3 µg retinol. USNIH ODS
Unit: RAE (retinol activity equivalents): 1 µg RAE = 1 µg retinol = 2 µg SUPPLEMENTAL beta-carotene = 12 µg DIETARY beta-carotene = 24 µg dietary alpha-carotene or beta-cryptoxanthin. Published in µg RAE, not iu; the label factor is 1 IU = 0.3 µg retinol. USNIH ODS
Unit: as PREFORMED vitamin A only (retinol and retinyl esters); published in µg, not IU. Label conversion: 1 IU = 0.3 µg retinol, so the 3,000 µg UL equals 10,000 IU. USNIH ODS
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-a, retrieved 13 November 2026. Every card has its own address: add #eu-rda-2 to the page URL for the first one.
Products in Stacky’s catalogue containing Vitamin A
13 products whose label declares vitamin A, 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: Softgel, Capsule.
Default food note in the app: with food.
Recorded interactions
How Stacky summarises what a named source says about vitamin A 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: 3 such rows for Vitamin A stay in the app. 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 Vitamin K2 | 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 |
Indexed studies
Stacky has 5 papers indexed against vitamin A, and none of them is published here. A study reaches this page only if its own title names Vitamin A 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 A 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.