PlainVitamins

Gluco-Flex Forte

by Douglas Laboratories · capsule · 90 capsules

  • On the market (NIH)
  • UPC 3 10539 01419 6
  • DSLD label 57347
  • Serving 1 capsule
  • 90 servings

Gluco-Flex Forte by Douglas Laboratories lists 3 ingredients, 3 with an amount per serving of 1 capsule, such as 250 mg of N-acetyl glucosamine, 250 mg of glucosamine sulfate and 100 mg of bovine cartilage. Its current label entered the NIH Dietary Supplement Label Database on April 22, 2016.

What is in Gluco-Flex Forte?

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).

Gluco-Flex Forte: Supplement Facts rows against the market (DSLD label 57347, January 2026 release)
IngredientAmount% DVAmong products listing it
N-Acetyl Glucosamine250 mgN-Acetyl Glucosamine in Gluco-Flex Forte against 148 products250 mg per serving; the middle half of products list 79 mg to 500 mg, the median 250 mg.250 mg

46% of 148 products listing N-acetyl glucosamine give more (median 250 mg).

Glucosamine Sulfateas Crab, ShrimpGlucosamine Sulfate (Form: from Crab, and Shrimp)250 mgGlucosamine Sulfate in Gluco-Flex Forte against 875 products0.25 g per serving; the middle half of products list 0.5 g to 1.5 g, the median 1 g.0.25 g

89% of 875 products listing glucosamine sulfate give more (median 1 g).

Bovine Cartilage100 mgCartilage in Gluco-Flex Forte against 199 products100 mg per serving; the middle half of products list 40 mg to 750 mg, the median 100 mg.100 mg

47% of 199 products listing cartilage give more (median 100 mg).

Source: NIH ODS Dietary Supplement Label Database, label 57347 (entered April 22, 2016), 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:

  • 89% of the 875 products that print an amount of glucosamine sulfate list more than its 0.25 g of glucosamine sulfate (median 1 g).

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 Gluco-Flex Forte's, rare ingredients counting for more.

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: As a dietary supplement, adults take 1 capsule daily or as directed by your healthcare professional.
Warnings
Warning: If you have an allergy to shellfish, (including crab and shrimp) you should not use this product.
KEEP OUT OF REACH OF CHILDREN.
Tamper resistant package, do not use if outer seal is missing.
Allergens and what it does not contain
This product contains NO yeast, wheat, gluten, soy protein, milk/dairy, corn, sodium, sugar, starch, artificial coloring, preservatives or flavoring.
Storage
For optimal storage conditions, store in a cool, dry place. (59(0)-77(0)F/15(0)-25(0)C) (35-65% relative humidity)

Source: label statements in DSLD label 57347.

What else is on the label?

Other ingredients: Cellulose, Gelatin, Dicalcium Phosphate, Magnesium Silicate, Vegetable Stearate.

How many labels does Gluco-Flex Forte have?

3 labels are on file under this name since February 23, 2012: other sizes, label designs and reformulations. The current one leads this page.

  1. Label 57347 (current) Entered April 22, 2016 · on the market · 90 capsules · UPC 3 10539 01419 6
  2. Label 9896 Entered June 1, 2012 · on the market · 90 capsules · UPC 3 10539 00722 8
  3. Label 6246 Entered February 23, 2012 · off the market January 20, 2012 · 60 capsules

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

Who makes it?

The label names Douglas Laboratories (manufacturer), Pittsburgh, PA. All Douglas Laboratories products.

Where next?