Vitamin B9
What the European Food Safety Authority and the United States National Institutes of Health have published about vitamin B9 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 B9 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.
European Union — EFSA
Applies to one chemical form only: DFE: ug DFE = ug food folate + (1.7 x ug folic acid) EFSA →
Applies to one chemical form only: folic acid and authorised 5-MTHF salts; not natural food folate EFSA →
United States — NIH ODS / IOM
Applies to one chemical form only: DFE (dietary folate equivalents) NIH ODS / IOM-DRI (NASEM) →
Applies to one chemical form only: synthetic folic acid only NIH ODS / IOM-DRI (NASEM) →
Products in Stacky’s catalogue containing Vitamin B9
7 products whose label declares vitamin B9, 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.
Recorded interactions
What a named source says about vitamin B9 taken alongside another substance: absorption and nutrient status only. Each row links to its source. 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 B9 stays in the app. None of these says whether a combination is good or bad.
| Relationship | What the source says | Source |
|---|---|---|
| Documented relationship with Vitamin B2 | Riboflavin is the precursor of FAD, the cofactor for MTHFR, the enzyme that produces the active circulating form of folate. The link is described as strongest in people carrying two copies of the common MTHFR c.677C>T variant, who typically show low folate status. Scope the source gave: effect is largest in people homozygous for the MTHFR c.677C>T variant. |
Linus Pauling Institute Checked 6 Aug 2026 |
| Documented relationship with Zinc | The bioavailability of dietary folate depends on a zinc-dependent enzyme, and some studies found that low zinc intake decreased folate absorption. The reverse effect of folic acid on zinc has been suggested but was not seen in a study giving 800 mcg a day of folic acid to people on a low-zinc diet. | Linus Pauling Institute Checked 6 Aug 2026 |
Indexed studies
Stacky has 5 papers indexed against vitamin B9, and none of them is published here. A study reaches this page only if its own title names Vitamin B9 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 B9 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.