Vitamin · Supplement ingredient
Vitamin C
Vitamin C is listed on 19,514 U.S. supplement product labels in the NIH DSLD, #8 of 4,614 by label frequency.
- 19,514
- Products
- #8 of 4,614
- By frequency
- NIH
- Dosing fact sheet
Vitamin C dosing reference
NIH ODS Fact Sheet →- Recommended Dietary Allowance (RDA / AI)
- 90 mg for adult men, 75 mg for adult women; smokers add 35 mg
- Tolerable Upper Intake Level (UL)
- 2,000 mg per day for adults
- Unit conversion
- Vitamin C is water-soluble; excess is excreted. Doses above 1,000 mg may cause diarrhea.
- Drug interactions
- May reduce effectiveness of chemotherapy and radiation therapy; may increase iron absorption. Discuss high-dose use with your provider.
- Pregnancy & lactation
- RDA during pregnancy is 85 mg; lactation 120 mg. UL remains 2,000 mg.
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/VitaminC-HealthProfessional/
How common is Vitamin C?
Number of supplement labels listing Vitamin C 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 A
Vitamin A
9,395 products
Products containing Vitamin C
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 C: closest on total DSLD label listings (19,514 here) and closest on distinct brands that list it (1,945 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.
Similar brand breadth
Nearest other ingredients by distinct brands listing them (floored at ≥100 brands), distinct from the label-frequency row.
Frequently asked about Vitamin C
What is the Recommended Dietary Allowance (RDA) for Vitamin C? ▼
Is there an upper limit for Vitamin C? ▼
How are Vitamin C units measured? ▼
Does Vitamin C interact with medications? ▼
What about Vitamin C during pregnancy or breastfeeding? ▼
How many supplement products contain Vitamin C? ▼
Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD) · Dosing reference: NIH ODS Vitamin C 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.