Vitamin C
What the European Food Safety Authority and the United States National Institutes of Health have published about vitamin C 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 C 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 vitamin C 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-c, retrieved 13 November 2026. Every card has its own address: add #eu-rda-3 to the page URL for the first one.
Products in Stacky’s catalogue containing Vitamin C
17 products whose label declares vitamin C, 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: Powder, Capsule.
Default time of day in the app: Morning. A person can move it; the app never changes a dose.
Recorded interactions
How Stacky summarises what a named source says about vitamin C 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 |
|---|---|---|
| Increases absorption or status of Chromium | Ascorbic acid increases chromium absorption. The supporting human observation is small: giving 100 mg of vitamin C together with chromium produced higher plasma chromium than chromium alone. Scope the source gave: taken at the same time; human evidence is a three-person study using 100 mg vitamin C with 1 mg chromium. |
NIH ODS Checked 6 Aug 2026 |
| Reduces absorption or status of Copper | Reduced copper levels are listed among the reported effects of high vitamin C intakes. Scope the source gave: high intakes of vitamin C. |
NIH ODS Checked 6 Aug 2026 |
| Increases absorption or status of Iron | Vitamin C improves the absorption of non-heme iron, the form found in plant foods and most iron supplements. The effect is described for vitamin C and iron consumed together. Scope the source gave: non-heme iron, when the two are consumed in the same meal. |
NIH ODS Checked 6 Aug 2026 |
| Increases absorption or status of Vitamin E | Vitamin C regenerates other antioxidants in the body, including alpha-tocopherol. In a trial in smokers and non-smokers, vitamin C supplementation reduced the rate of vitamin E loss from plasma. | NIH ODS Checked 6 Aug 2026 |
Indexed studies
A study reaches this page only if its own title names Vitamin C 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 C; 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 C does what it set out to test. How this list is built →
| Title | Journal | Year | Reference |
|---|---|---|---|
| The Effects of Dietary Supplementation with Collagen and Vitamin C and Their Combination with Hyaluronic Acid on Skin Density, Texture and Other Parameters: A Randomised, Double-Blind, Placebo-Controlled Trial. | Nutrients | 2024 | PubMed 38931263 |
| Vitamin C Supplementation and Athletic Performance: A Review. | Curr Sports Med Rep | 2023 | PubMed 37417662 |
Showing 2 of the 5 papers indexed against vitamin C 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 C 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.