Vitamin B3 (niacin)
Full ranking Dose tool Products (4,910)
Key facts
Sources: https://ods.od.nih.gov/factsheets/Niacin-HealthProfessional/ · FDA DV 16 mg (https://www.fda.gov/food/nutrition-facts-label/daily-value-nutrition-and-supplement-facts-labels); pre-2016 DV [20] (https://www.federalregister.gov/documents/2016/05/27/2016-11867/food-labeling-revision-of-the-nutrition-and-supplement-facts-labels); adult UL 35 mg
Daily dose across products (mg/day)
Label data from official national databases and brand websites, as declared; not lab-verified.
Common forms
| Form | Products | Median | P5–P95 | Elemental fraction |
|---|---|---|---|---|
| Niacinamide (nicotinamide) | 3305 | 20 mg | 5 – 150 | — |
| Nicotinic acid | 315 | 25 mg | 3.75 – 500 | — |
| Inositol hexanicotinate | 186 | 100 mg | 0.8 – 640 | — |
Common questions
What is the Daily Value for Vitamin B3 (niacin)?
The US FDA Daily Value for adults and children aged 4 and over is 16 mg. It is a labelling reference, not a personal recommendation. [source]
Is there an upper limit for Vitamin B3 (niacin)?
The adult Tolerable Upper Intake Level (UL) is 35 mg per day. Going above it long term raises the risk of adverse effects. See the linked source. [source]
How much Vitamin B3 (niacin) do products usually contain per day?
As of 2026-11-01, 4,910 products list a comparable daily dose (5,443 dose records; one product can have several). The median is 20 mg per day, and 90% of records fall between 3.3 and 200 mg. Figures come from labels and are not lab-tested. [source]
What are the side effects of Vitamin B3 (niacin)?
Niacin in food is safe. Supplements with 30 mg or more of nicotinic acid can make the skin on the face, arms and chest turn red and burn, tingle and itch (flushing), and can cause headaches, rashes and dizziness. Nicotinamide has fewer side effects than nicotinic acid. (Source: NIH ODS) [source]
What happens if you take too much Vitamin B3 (niacin)?
The adult UL from supplements is 35 mg a day. Nicotinic acid at 1,000 mg a day or more can cause low blood pressure, extreme tiredness, high blood sugar, nausea and abdominal pain, and vision problems; long-term use, especially extended-release forms, can damage the liver. Nicotinamide at 500 mg a day or more can cause diarrhea and easy bruising, and 3,000 mg or more can damage the liver. (Source: NIH ODS) [source]
Is Vitamin B3 (niacin) safe during pregnancy and breastfeeding?
The recommended amount is 18 mg NE a day in pregnancy and 17 mg NE while breastfeeding. (Source: NIH ODS) [source]
Does Vitamin B3 (niacin) interact with medications or other supplements?
Tuberculosis drugs such as isoniazid and pyrazinamide block conversion of tryptophan to niacin and can lower niacin levels. Nicotinic acid at 1,500 mg a day or more can raise blood sugar and interfere with diabetes drugs. Experts do not recommend high-dose nicotinic acid for people taking a statin. (Source: NIH ODS) [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Capwork Health Inc. | Total Natural Niacin | 10 mg | 60.0 |
| 1 | Prestige Nutrition Inc. | Vitamin B3 | 10 mg | 60.0 |
| 3 | Solaray | Niacin 100 mg | 100 mg | 50.0 |
| 4 | Nature's Way | Niacin 100 mg | 100 mg | 46.7 |
| 4 | Bluebonnet | Niacin 100 mg | 100 mg | 46.7 |