Quercetin
by Natural Factors · capsule · 90 capsules
- On the market (NIH)
- UPC 0 68958 01387 9
- DSLD label 75019
- Serving 1 capsule
Quercetin by Natural Factors lists 5 ingredients, 5 with an amount per serving of 1 capsule, such as 235 mg of quercetin bioflavonoids extract, 45 mg of bromelain and 45 mg of rutin extract. Its current label entered the NIH Dietary Supplement Label Database on July 25, 2017.
What is in Quercetin?
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).
| Ingredient | Amount | % DV | Among products listing it |
|---|---|---|---|
| Quercetin Bioflavonoids extractQuercetin Bioflavonoids extract Note: 20:1 | 235 mg | Higher than 71% of 1,548 products listing quercetin (median 100 mg). Per day at the most servings: 705 mg. | |
| Japanese Pagoda | 4.7 g | ||
| Citrus Bioflavonoids extractas Citrus FruitsCitrus Bioflavonoids extract (Form: from Citrus Fruits (Form: Citrus limon PlantPart: fruit rind, Citrus sinensis PlantPart: fruit rind Genus: Citrus Species: sinensis, Citrus paradisi PlantPart: fruit rind Genus: Citrus Species: paradisi, Citrus reticulata PlantPart: fruit rind Genus: Citrus Species: reticulata, Citrus aurantifolia PlantPart: fruit rind Genus: Citrus Species: aurantifolia)) | 235 mg | ||
| Bromelainas PineappleBromelain (Form: Ananas comosus PlantPart: pineapple stem Genus: Ananas Species: comosus) Note: 1000 GDU/g | 45 mg | 61% of 1,337 products listing bromelain give more (median 50 mg). Per day at the most servings: 135 mg. | |
| Rutin extractRutin extract Note: 20:1 | 45 mg | Higher than 68% of 1,232 products listing rutin (median 25 mg). Per day at the most servings: 135 mg. | |
| Japanese Pagoda | 900 mg |
Source: NIH ODS Dietary Supplement Label Database, label 75019 (entered July 25, 2017), 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?
Every amount on this label with a position sits within the middle 80% of the products that list the same ingredient.
The NIH database records 1 to 3 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?
The products whose ingredient lists overlap most with Quercetin's, rare ingredients counting for more.
- Rutin 250 mgNatural Factors 2 shared, 56% alike
- TraumericOrtho Molecular Products 3 shared, 49% alike
- Quercetin Bioflavonoid ComplexNatural Factors · off the market 3 shared, 48% alike
- Mega QuercetinSolaray · off the market 3 shared, 40% alike
- Mega Quercetin 600 mgSolaray 3 shared, 40% alike
- Bromelain + QuercetinSurgery Vitamin · off the market 2 shared, 39% 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
- Suggested Usage: 1 capsule 1-3 times per day or as directed by a health professional.
- Warnings
- Cautions: As with any supplement, consult your health professional before use if you are pregnant, breastfeeding, or trying to conceive, or if you are taking medication, have a medical condition, or anticipate a surgery.
- Keep out of the reach of children.
- Sealed for your protection. Do not use if seal is broken.
- Allergens and what it does not contain
- Non-GMO
- Contains no artificial colors, preservatives or sweeteners; no dairy, sugar, wheat, gluten, yeast, soy, corn, egg, fish, shellfish, salt, tree nuts, or GMOs.
- Storage
- For freshness, store in a cool, dry place.
Source: label statements in DSLD label 75019.
What else is on the label?
Other ingredients: Gelatin Capsule, Rice powder, Magnesium Stearate, Silica.
Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): Purity & potency guaranteed.
How many labels does Quercetin have?
2 labels are on file under this name since June 23, 2017: other sizes, label designs and reformulations. The current one leads this page.
- Label 75019 (current) Entered July 25, 2017 · on the market · 90 capsules · UPC 0 68958 01387 9
- Label 75011 Entered June 23, 2017 · on the market · 60 capsules · UPC 0 68958 01386 2
Source: DSLD label entry and market events, version 9.4.0 (labels entered through September 25, 2025).
Who makes it?
The label names Natural Factors Canada (manufacturer). All Natural Factors products.