Vitamin D3
What the European Food Safety Authority and the United States National Institutes of Health have published about vitamin D3 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 D3 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 = 40 IU EUEFSA
Unit: µg vitamin D equivalents (VDE); 1 µg VDE = 1 µg cholecalciferol (D3) = 40 IU EUEFSA
USUnited States — NIH ODS / IOM
Unit: as cholecalciferol; 1 µg = 40 IU USNIH ODS
Unit: as cholecalciferol; 1 µg = 40 IU USNIH ODS
Unit: 1 µg = 40 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-d3, 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 D3
30 products whose label declares vitamin D3, 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.
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 vitamin D3 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 D3 stays in the app. None of these says whether a combination is good or bad.
| Stacky’s category | Summary, in Stacky’s words | Source |
|---|---|---|
| Increases absorption or status of Calcium | Vitamin D promotes the absorption of calcium in the gut and helps maintain serum calcium concentrations. The two are commonly formulated together in bone-health products. | NIH ODS Checked 6 Aug 2026 |
| Documented relationship with Magnesium | Magnesium influences the concentration of the active form of vitamin D as well as parathyroid hormone. Low magnesium status is described alongside resistance to some of the effects of vitamin D. | NIH ODS Checked 6 Aug 2026 |
| Increases absorption or status of Phosphorus | Vitamin D helps maintain adequate serum phosphate concentrations, which is part of how it enables normal bone mineralisation. Vitamin D and parathyroid hormone jointly regulate phosphorus metabolism. | NIH ODS Checked 6 Aug 2026 |
| Documented relationship with Vitamin D2 | Both forms raise serum 25(OH)D, but vitamin D3 raises it more than vitamin D2 and maintains the higher level for longer. Most steps in the metabolism and actions of the two forms are otherwise identical. | NIH ODS Checked 6 Aug 2026 |
Indexed studies
A study reaches this page only if its own title names Vitamin D3 or one of its recorded alternative names, and does not name a disease or clinical condition. The second rule removes papers that are about vitamin D3; a title naming a condition beside a substance reads as a claim, and this page makes none. Titles are the studies’ own words, newest first. A study being listed is not a statement that vitamin D3 does what it set out to test. How this list is built →
| Title | Journal | Year | Reference |
|---|---|---|---|
| Vitamin D(3) and marine ω-3 fatty acids supplementation and leukocyte telomere length: 4-year findings from the VITamin D and OmegA-3 TriaL (VITAL) randomized controlled trial. | Am J Clin Nutr | 2025 | PubMed 40409468 |
| Vitamin D Supplementation: A Review of the Evidence Arguing for a Daily Dose of 2000 International Units (50 µg) of Vitamin D for Adults in the General Population. | Nutrients | 2024 | PubMed 38337676 |
| Comparison of vitamin D2 and vitamin D3 supplementation in raising serum 25-hydroxyvitamin D status: a systematic review and meta-analysis. | Am J Clin Nutr | 2012 | PubMed 22552031 |
Showing 3 of the 5 papers indexed against vitamin D3 in Stacky.
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 D3 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.