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Vitamin · Supplement ingredient

Vitamin B3

Vitamin B3 is listed on 17 U.S. supplement product labels in the NIH DSLD, #1,665 of 4,614 by label frequency.

17
Products
#1,665 of 4,614
By frequency
NIH
Dosing fact sheet
Verify with NIH DSLD → · FDA Daily Value reference →

Vitamin B3 (Niacin) dosing reference

NIH ODS Fact Sheet →
Recommended Dietary Allowance (RDA / AI)
16 mg NE for adult men, 14 mg NE for adult women
Tolerable Upper Intake Level (UL)
35 mg per day for adults (applies to nicotinic acid and nicotinamide forms in supplements/fortification)
Unit conversion
1 mg NE (Niacin Equivalent) = 1 mg niacin = 60 mg dietary tryptophan.
Drug interactions
High doses of nicotinic acid (1,000+ mg) used to treat dyslipidemia can cause flushing, liver toxicity, and interact with statins.
Pregnancy & lactation
RDA during pregnancy is 18 mg NE; lactation 17 mg NE.

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/Niacin-HealthProfessional/

How common is Vitamin B3?

Number of supplement labels listing Vitamin B3 vs nearby vitamin ingredients

products
Source NIH Dietary Supplement Label Database (DSLD) As of 2026

Products containing Vitamin B3

B Vitamin & Ginseng Complex
Higher Nature
30 ingredients · Botanical with Nutrients
On Market
Cardio Complete
Carlson
43 ingredients · Other Combinations
On Market
Niacin 100 mg
Exchange Select X
6 ingredients · Vitamin
On Market
Spectrum Support One Part A Lemon Lime Flavor
Brainchild Nutritionals
35 ingredients · Other Combinations
On Market
Spectrum Support Pak Part A Lemon Lime Flavor
Brainchild Nutritionals
37 ingredients · Other Combinations
On Market
Spectrum Support Three Lemon Lime Flavor
Brainchild Nutritionals
33 ingredients · Other Combinations
On Market
Spectrum Support Three Part A
Brainchild Nutritionals
36 ingredients · Other Combinations
On Market
Spectrum Support Two Part A
Brainchild Nutritionals
36 ingredients · Other Combinations
On Market
Niacin 250 mg
Exchange Select X
9 ingredients · Vitamin
Off Market

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.

Compare Vitamin B3 vs Vitamin C →

Vitamin C
19,514 products · Vitamin
Vitamin E
13,826 products · Vitamin
Vitamin D
13,343 products · Vitamin
Vitamin B12
11,614 products · Vitamin
Vitamin B6
10,881 products · Vitamin

Frequently asked about Vitamin B3

What is the Recommended Dietary Allowance (RDA) for Vitamin B3 (Niacin)? ▼
16 mg NE for adult men, 14 mg NE for adult women. The RDA is the average daily intake sufficient to meet the nutrient requirements of nearly all (97–98%) healthy people. Source: NIH Office of Dietary Supplements.
Is there an upper limit for Vitamin B3 (Niacin)? ▼
35 mg per day for adults (applies to nicotinic acid and nicotinamide forms in supplements/fortification) (Tolerable Upper Intake Level, UL, the maximum daily intake unlikely to cause adverse health effects in the general population).
How are Vitamin B3 (Niacin) units measured? ▼
1 mg NE (Niacin Equivalent) = 1 mg niacin = 60 mg dietary tryptophan.
Does Vitamin B3 (Niacin) interact with medications? ▼
High doses of nicotinic acid (1,000+ mg) used to treat dyslipidemia can cause flushing, liver toxicity, and interact with statins. This is a partial list, always discuss supplement use with a pharmacist or prescribing provider.
What about Vitamin B3 (Niacin) during pregnancy or breastfeeding? ▼
RDA during pregnancy is 18 mg NE; lactation 17 mg NE.
How many supplement products contain Vitamin B3? ▼
17 supplement product labels in the NIH DSLD currently lists Vitamin B3 as an ingredient. By label frequency it ranks #1,665 of 4,614 among ingredients PlainVitamins ranks (same sort as /rankings/most-common-ingredients). Browse them below.

Source: NIH Office of Dietary Supplements, Dietary Supplement Label Database (DSLD) · Dosing reference: NIH ODS Vitamin B3 (Niacin) 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.