Flush-Free Niacin 500 mg

by Quest · capsule · 60 capsules

Off the market since October 2023 (NIH)
UPC 0 58371 21176 1
DSLD label 23989
Serving 1 capsule

Flush-Free Niacin 500 mg by Quest lists 2 ingredients, 2 with an amount per serving of 1 capsule, such as 500 mg of niacin and 143 mg of inositol. Its current label entered the NIH Dietary Supplement Label Database on July 25, 2013.

What is in Flush-Free Niacin 500 mg?

Each row as the label prints it, per serving of 1 capsule. 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).

Flush-Free Niacin 500 mg: Supplement Facts rows against the market (DSLD label 23989, January 2026 release)
Ingredient	Amount	% DV	Among products listing it
Niacinas Inositol Nicotinate	500 mg	3,125%*	Higher than 98% of 12,413 products listing niacin (median 20 mg). 14.3 times the adult UL a day.
Inositolas Inositol Nicotinate	143 mg		Higher than 87% of 4,042 products listing inositol (median 30 mg).

* % Daily Value computed from the printed amount and the FDA Daily Value (21 CFR 101.9); the label prints none for that row.

Source: NIH ODS Dietary Supplement Label Database, label 23989 (entered July 25, 2013), version 9.4.0. See the label on DSLD. 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.

Non-Flush Niacin 500 mgNature's Harmony same ingredients
No-Flush Niacin 500 mgSource Naturals same ingredients
Flush-Free Niacin Hexancotinate 320 mgNOW · off the market same ingredients
Flush-Free NiacinNew You Vitamins · off the market same ingredients
No-Flush Niacin 500 mgThe Vitamin Shoppe same ingredients
No Flush Niacin 500 mgThompson same ingredients

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: Recommended Use: Helps normal growth and development. Helps the body to metabolize carbohydrates, fats and proteins. Recommended Dose (Adults): Take 1 capsule daily with food.
Warnings: Do not exceed the recommended dose except on the advice of a health care practitioner.; Risk Information: Do not use if you are pregnant, taking prescription medications or if you have a bleeding disorder.; KEEP OUT OF REACH OF CHILDREN.; DO NOT USE IF SEAL UNDER CAP IS BROKEN.
Allergens and what it does not contain: This product does not contain corn, dairy, egg, gluten, shellfish, soy or sulfites.; No artificial colours, flavours or preservatives
Storage: STORE IN A COOL, DRY PLACE.

Source: label statements in DSLD label 23989.

What else is on the label?

Other ingredients: Microcrystalline Cellulose, Magnesium Stearate, Gelatin.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): {Recycle}; SunOpta A healthy products company; PREMIUM - QUALITY ASSURED.

How many labels does Flush-Free Niacin 500 mg have?

One label is on file, entered on July 25, 2013.

Label 23989 (current) Entered July 25, 2013 · off the market October 12, 2023 · 60 capsules · UPC 0 58371 21176 1

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

Who makes it?

The label names SunOpta Inc. (manufacturer), Acton, ON. All Quest products.