PlainVitamins

Quercetin 500 Plus

by Vitamin Discount Center · tablet or pill · 100 tablets

  • Off the market since November 2023 (NIH)
  • DSLD label 297909
  • Serving 1 tablet
  • 100 servings

Quercetin 500 Plus by Vitamin Discount Center lists 6 ingredients, 6 with an amount per serving of 1 tablet, such as 250 mg of vitamin C, 10 mg of manganese, 500 mg of quercetin and 50 mg of bromelain. Its current label entered the NIH Dietary Supplement Label Database on October 24, 2023.

What is in Quercetin 500 Plus?

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).

Quercetin 500 Plus: Supplement Facts rows against the market (DSLD label 297909, January 2026 release)
IngredientAmount% DVAmong products listing it
Vitamin Cas Ascorbic Acid250 mg278%Vitamin C in Quercetin 500 Plus against 18,583 products250 mg per serving; the middle half of products list 60 mg to 270 mg, the median 100 mg.DV 90 mgUL 2,000 mg250 mg

Higher than 68% of 18,583 products listing vitamin C (median 100 mg). Per day at the most servings: 500 mg.

Manganeseas Manganese Amino Acid Chelate10 mg435%Manganese in Quercetin 500 Plus against 7,016 products10 mg per serving; the middle half of products list 1 mg to 3.92 mg, the median 2 mg.DV 2.3 mgUL 11 mg10 mg

Higher than 93% of 7,016 products listing manganese (median 2 mg). Per day at the most servings: 20 mg. 1.8 times the adult UL a day.

Quercetin500 mgQuercetin in Quercetin 500 Plus against 1,548 products500 mg per serving; the middle half of products list 26.5 mg to 250 mg, the median 100 mg.500 mg

Higher than 84% of 1,548 products listing quercetin (median 100 mg). Per day at the most servings: 1,000 mg.

Bromelainas Ananas comosus Fruit Extractstandardized to 1800 GDU/g50 mgBromelain in Quercetin 500 Plus against 1,337 products50 mg per serving; the middle half of products list 25 mg to 200 mg, the median 50 mg.50 mg

50% of 1,337 products listing bromelain give more (median 50 mg). Per day at the most servings: 100 mg.

Turmeric Rhizome Extractas Curcuminstandardized to 95% curcumin50 mgTurmeric in Quercetin 500 Plus against 2,369 products50 mg per serving; the middle half of products list 50 mg to 500 mg, the median 150 mg.50 mg

71% of 2,369 products listing turmeric give more (median 150 mg). Per day at the most servings: 100 mg.

Citrus Bioflavonoids100 mgFlavonoid in Quercetin 500 Plus against 2,343 products100 mg per serving; the middle half of products list 25 mg to 100 mg, the median 50 mg.100 mg

Higher than 62% of 2,343 products listing flavonoid (median 50 mg). Per day at the most servings: 200 mg.

Source: NIH ODS Dietary Supplement Label Database, label 297909 (entered October 24, 2023), 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 2 servings a day, the most its directions give, the label lists 20 mg of manganese, 1.8 times the adult Tolerable Upper Intake Level.

The NIH database records 2 servings 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?

4 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
Suggested use: as a dietary supplement, adults take one (1) tablet, two (2) times daily with meals, or as directed by a health care professional.
Warnings
Keep out of reach of children.
Allergens and what it does not contain
Contains no sugar, salt, dairy, yeast, wheat, gluten, corn, preservatives, artificial colors or flavors.
Storage
Store in a cool, dry place and away from direct light.

Source: label statements in DSLD label 297909.

What else is on the label?

Other ingredients: Cellulose, Cellulose Gum, Silica, Food Glaze, Vegetable Stearin, Magnesium Stearate, Calcium Silicate, Modified Cellulose.

How many labels does Quercetin 500 Plus have?

One label is on file, entered on October 24, 2023.

  1. Label 297909 (current) Entered October 24, 2023 · off the market November 17, 2023 · 100 tablets

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

Who makes it?

The label names Vitamin Discount Center, LLC (distributor), Tampa, Florida. All Vitamin Discount Center products.

Where next?