Vitamin · Supplement ingredient
Vitamin B9
Vitamin B9 is listed on 126 U.S. supplement product labels in the NIH DSLD, #731 of 4,614 by label frequency.
- 126
- Products
- #731 of 4,614
- By frequency
- NIH
- Dosing fact sheet
Folate (Vitamin B9) dosing reference
NIH ODS Fact Sheet →- Recommended Dietary Allowance (RDA / AI)
- 400 mcg DFE for adults
- Tolerable Upper Intake Level (UL)
- 1,000 mcg per day from fortified foods or supplements (no UL on natural folate)
- Unit conversion
- 1 mcg DFE (Dietary Folate Equivalent) = 1 mcg food folate = 0.6 mcg folic acid from fortified food = 0.5 mcg folic acid supplement on empty stomach.
- Drug interactions
- Interacts with anticonvulsants (phenytoin), methotrexate, sulfasalazine. May mask vitamin B12 deficiency at high doses.
- Pregnancy & lactation
- CRITICAL: 600 mcg DFE during pregnancy; 500 mcg lactation. Pre-conception folate (400 mcg/day) reduces neural tube defect risk by ~50–70%.
Statement required by FDA: These statements have not been evaluated by the Food and Drug Administration. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Consult a licensed healthcare provider before starting, stopping, or combining any supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.
Source: https://ods.od.nih.gov/factsheets/Folate-HealthProfessional/
How common is Vitamin B9?
Number of supplement labels listing Vitamin B9 vs nearby vitamin ingredients
- Vitamin C
Vitamin C
19,514 products
- Vitamin E
Vitamin E
13,826 products
- Vitamin D
Vitamin D
13,343 products
- Vitamin B12
Vitamin B12
11,614 products
- Vitamin B6
Vitamin B6
10,881 products
- Vitamin B9 126
Vitamin B9
126 products
Products containing Vitamin B9
Nearby Ingredients in Vitamin
Other ingredients in the Vitamin category cataloged in the NIH DSLD. Useful for comparing how common different nutrients are across the US supplement market.
Nationwide ingredients with similar DSLD presence
Two peer sets for Vitamin B9: closest on total DSLD label listings (126 here) and closest on distinct brands that list it (55 here). Peers exclude the same DSLD category, and rows stay link-disjoint so each axis is a distinct neighborhood.
Similar label frequency
Nearest other ingredients by distinct DSLD product labels (floored at ≥50), outside this category.
Frequently asked about Vitamin B9
What is the Recommended Dietary Allowance (RDA) for Folate (Vitamin B9)? ▼
Is there an upper limit for Folate (Vitamin B9)? ▼
How are Folate (Vitamin B9) units measured? ▼
Does Folate (Vitamin B9) interact with medications? ▼
What about Folate (Vitamin B9) during pregnancy or breastfeeding? ▼
How many supplement products contain Vitamin B9? ▼
Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD) · Dosing reference: NIH ODS Folate (Vitamin B9) Health Professional Fact Sheet. Regulatory reference: Source: Dietary Supplement Health and Education Act (DSHEA), 1994, 21 U.S.C. § 321(ff).
Disclaimer, Not Medical Advice: Information on this page is based on manufacturer-declared label data and is provided for educational and reference purposes only. It does not constitute medical, nutritional, or health advice. Consult a licensed healthcare provider before starting, stopping, or combining any supplement, especially if you are pregnant, nursing, take prescription medication, or have a medical condition.
Read our methodology , how this data is sourced, computed, and verified.
Every figure on PlainVitamins is rendered directly from the NIH Dietary Supplement Label Database (DSLD), no number is typed in by an editor. Ingredient figures are computed directly from the NIH DSLD, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.