PlainVitamins

Niacinamide 500 mg

by 21st Century · tablet or pill · 110 tablets

  • On the market (NIH)
  • UPC 7 40985 22550 9
  • DSLD label 326336
  • Serving 1 tablet
  • 110 servings

Niacinamide 500 mg by 21st Century lists 2 ingredients, 2 with an amount per serving of 1 tablet, such as 500 mg of niacinamide and 160 mg of calcium. Its current label entered the NIH Dietary Supplement Label Database on March 25, 2025.

What is in Niacinamide 500 mg?

Each row as the label prints it, per serving of 1 tablet. The capsule beside an amount places it among every product in the NIH database that lists the same ingredient: the bar is the middle half of their amounts, the line in it the median, the whiskers the 10th and 90th percentiles; the green tick is the FDA Daily Value and the red dashed tick the adult upper limit (IOM).

Niacinamide 500 mg: Supplement Facts rows against the market (DSLD label 326336, January 2026 release)
IngredientAmount% DVAmong products listing it
Niacinamide500 mg3,125%Niacin in Niacinamide 500 mg against 12,413 products500 mg per serving; the middle half of products list 13.2 mg to 48 mg, the median 20 mg.DV 16 mgUL 35 mg500 mg

Higher than 98% of 12,413 products listing niacin (median 20 mg). 14.3 times the adult UL a day.

Calciumas Calcium Carbonate160 mg12%Calcium in Niacinamide 500 mg against 17,831 products160 mg per serving; the middle half of products list 50 mg to 252 mg, the median 115 mg.DV 1,300 mgUL 2,500 mg160 mg

Higher than 60% of 17,831 products listing calcium (median 115 mg).

Source: NIH ODS Dietary Supplement Label Database, label 326336 (entered March 25, 2025), version 9.4.0. See the label on DSLD or its label image (PDF). Amounts are what the maker printed; DSLD does not test products. Daily Values: the FDA's Daily Value page.

Is that a lot?

The rows in the top or bottom tenth of the products that list the same ingredient, and any above the adult upper limit at the most servings a day the directions give:

  • At 1 serving a day, the most its directions give, the label lists 500 mg of niacin, 14.3 times the adult Tolerable Upper Intake Level.

The NIH database records one serving a day from the label's directions; its % Daily Values are for adults and children 4 or more years of age. The directions as printed are further down this page.

The Tolerable Upper Intake Level is the most of a nutrient per day, from food, water and supplements together, that is likely to pose no risk for almost all adults (Institute of Medicine, 2011). It does not apply under medical supervision. This page compares labels; it is not medical advice.

Sources: amounts from the DSLD label; Daily Values from 21 CFR 101.9(c)(8)(iv); adult upper limits from the Institute of Medicine's DRI summary tables (2011). How positions are computed.

Which products have the closest formulas?

6 products list the very same ingredients; the nearest amounts come first.

Source: ingredient lists of every product's current label in DSLD (version 9.4.0); similarity weights each shared ingredient by how rare it is.

What does the label say about taking it?

Quoted from the label as DSLD transcribed it: the maker's words, including any claim about what the product does, which the FDA has not evaluated and PlainVitamins does not endorse.

Directions
Directions: As a vitamin supplement, adults take one (1) tablet daily with any meal or as directed by a healthcare provider.
Warnings
Do not exceed recommended dosage. Individual results may vary. Stop use and contact a physician if adverse reactions occur. Do not use if product appears to be tampered with or seal is broken.
Warning: Consult a healthcare provider prior to use if pregnant, nursing, on medications, have a medical condition or are planning a medical procedure.
Keep out of reach of children.
Allergens and what it does not contain
Gluten free Non-GMO
No added sugar, salt, yeast, preservatives, artificial flavors or colors.
Storage
Store at room temperature.

Source: label statements in DSLD label 326336.

What else is on the label?

Other ingredients: Cellulose, Hydroxypropyl Methylcellulose, Stearic Acid, Gum Acacia, Magnesium Silicate, Magnesium Stearate, Polyethylene Glycol, Polysorbate, Polyvinyl Alcohol, Silicon Dioxide.

How many labels does Niacinamide 500 mg have?

4 labels are on file under this name since July 25, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 326336 (current) Entered March 25, 2025 · on the market · 110 tablets · UPC 7 40985 22550 9
  2. Label 258480 Entered January 22, 2022 · off the market July 18, 2023 · 110 tablets · UPC 7 40985 22550 9
  3. Label 205952 Entered August 23, 2019 · off the market August 6, 2021 · 110 tablets · UPC 7 40985 22550 9
  4. Label 11485 Entered July 25, 2012 · off the market June 28, 2019 · 110 tablets · UPC 7 40985 22550 9

Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).

Who makes it?

The label names 21st Century HealthCare, Inc. (manufacturer), Tempe, AZ. All 21st Century products.

Where next?