Quercetin
by Natrol · capsule · 50 capsules
- Off the market since June 2022 (NIH)
- UPC 0 47469 00908 3
- DSLD label 202922
- Serving 2 capsules
- 25 servings
Quercetin by Natrol lists 7 ingredients, 3 with an amount per serving of 2 capsules, such as 1,000 mg of vitamin C, 500 mg of quercetin and 66 mg of citrus bioflavonoid complex; 4 sit inside a blend without their own amounts. Its current label entered the NIH Dietary Supplement Label Database on May 28, 2019.
What is in Quercetin?
Each row as the label prints it, per serving of 2 capsules. 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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Vitamin Cas Ascorbic Acid | 1,000 mg | 1,110% | Higher than 91% of 18,583 products listing vitamin C (median 100 mg). |
| Quercetin | 500 mg | Higher than 84% of 1,548 products listing quercetin (median 100 mg). | |
| Citrus Bioflavonoid ComplexCitrus Bioflavonoid Complex Note: may be derived from | 66 mg | Higher than 59% of 2,343 products listing flavonoid (median 50 mg). | |
| Orange | no amount given | ||
| Lemon | no amount given | ||
| Lime | no amount given | ||
| Tangerine | no amount given |
Source: NIH ODS Dietary Supplement Label Database, label 202922 (entered May 28, 2019), 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:
- Its 1,000 mg of vitamin C is higher than 91% of the 18,583 vitamin C products that print an amount; 445 list more.
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?
The products whose ingredient lists overlap most with Quercetin's, rare ingredients counting for more.
- Quercetin 500 mgNatrol · off the market 6 shared, 71% alike
- Quercetin 250 mgNatrol · off the market 6 shared, 71% alike
- Vitamin C-1000OL Olympian Labs · off the market 6 shared, 67% alike
- Ester-C 1000 mg with Citrus BioflavonoidsPhysioLogics · off the market 6 shared, 66% alike
- Ester-C 1000 mg with Citrus BioflavonoidsAmerican Health 6 shared, 66% alike
- Ester-C with Citrus BioflavonoidsAmerican Health 6 shared, 66% alike
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: Take 2 capsules,one time daily, with a meal.
- Warnings
- Warning: Consult your healthcare professional prior to use if you have or suspect a medical condition, are taking prescription drugs, or are pregnant or lactating.
- Keep out of reach of children.
- Allergens and what it does not contain
- No: Milk, egg, fish, crustacean shellfish, tree nuts, peanuts, wheat, soybeans, yeast, artificial colors or flavors, added sugar or preservatives
- Storage
- Store in a cool, dry place.
Source: label statements in DSLD label 202922.
What else is on the label?
Other ingredients: Gelatin, Magnesium Stearate, Silicon Dioxide.
How many labels does Quercetin have?
One label is on file, entered on May 28, 2019.
- Label 202922 (current) Entered May 28, 2019 · off the market June 10, 2022 · 50 capsules · UPC 0 47469 00908 3
DSLD also links this label to: Quercetin 500 mg (image difference, same product), Quercetin 500 mg (image difference, same product), Quercetin 250 mg (image difference, same product), Quercetin Complex (image difference, same product).
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Natrol, LLC. (manufacturer), Chatsworth, CA. All Natrol products.