PlainVitamins

Quercenase

by Thorne Research · capsule · 60 vegetarian capsules

  • Off the market since February 2018 (NIH)
  • UPC 6 93749 33202 2
  • DSLD label 35437
  • Serving 1 capsule

Quercenase by Thorne Research lists 2 ingredients, 2 with an amount per serving of 1 capsule, such as 250 mg of quercetin phytosome and 100 mg of bromelain. Its current label entered the NIH Dietary Supplement Label Database on July 25, 2014.

What is in Quercenase?

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).

Quercenase: Supplement Facts rows against the market (DSLD label 35437, January 2026 release)
IngredientAmount% DVAmong products listing it
Quercetin Phytosome250 mgQuercetin in Quercenase against 1,548 products250 mg per serving; the middle half of products list 26.5 mg to 250 mg, the median 100 mg.250 mg

Higher than 71% of 1,548 products listing quercetin (median 100 mg). Per day at the most servings: 750 mg.

Bromelainas PineappleBromelain (Form: is derived from the Pineapple PlantPart: plant Genus: Ananas Species: comosus)100 mgBromelain in Quercenase against 1,337 products100 mg per serving; the middle half of products list 25 mg to 200 mg, the median 50 mg.100 mg

Higher than 55% of 1,337 products listing bromelain (median 50 mg). Per day at the most servings: 300 mg.

Source: NIH ODS Dietary Supplement Label Database, label 35437 (entered July 25, 2014), 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 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?

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
Suggested Use: Take 1 capsule three times daily or as recommended by your health-care practitioner.
Warnings
Tamper Evident: Use only if bottle is sealed.
If pregnant, consult your health-care practitioner before using this product.
Allergens and what it does not contain
This product is not diluted with lactose.
Storage
Store tightly sealed in a cool, dry place.

Source: label statements in DSLD label 35437.

What else is on the label?

Other ingredients: Hypromellose (derived from cellulose) capsule, Microcrystalline Cellulose, Silicon Dioxide, Leucine.

Seals and symbols as the label prints them (the maker's; a certifier's own list confirms a seal): {pulled apart capsule}(R).

How many labels does Quercenase have?

3 labels are on file under this name since November 21, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 35437 (current) Entered July 25, 2014 · off the market February 2, 2018 · 60 vegetarian capsules · UPC 6 93749 33202 2
  2. Label 28360 Entered December 24, 2013 · off the market June 26, 2014 · 60 vegetarian capsules · UPC 6 93749 33202 2
  3. Label 16002 Entered November 21, 2012 · off the market November 26, 2013 · 60 vegetarian capsules · UPC 6 93749 33202 2

DSLD also links this label to: Quercenase (image difference, same product), Quercenase (image difference, same product), Quercenase (image difference, same product), Quercetin Complex (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 Thorne Research, Inc. (manufacturer), Dover, Idaho. All Thorne Research products.

Where next?