PlainVitamins

Glr-6

by IF Intestinal Fortitude · capsule · 120 capsules

  • On the market (NIH)
  • UPC 7 18598 79224 4
  • DSLD label 229801
  • Serving 4 vegetarian capsules
  • 30 servings

Glr-6 by IF Intestinal Fortitude lists 6 ingredients, 6 with an amount per serving of 4 vegetarian capsules, such as 800 mg of L-glutamine, 800 mg of N-acetyl-D-glucosamine, 300 mg of slippery elm powder and 300 mg of marshmallow extract. Its current label entered the NIH Dietary Supplement Label Database on July 23, 2020.

What is in Glr-6?

Each row as the label prints it, per serving of 4 vegetarian 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).

Glr-6: Supplement Facts rows against the market (DSLD label 229801, January 2026 release)
IngredientAmount% DVAmong products listing it
L-Glutamine800 mgGlutamine in GLR-6 against 1,850 products0.8 g per serving; the middle half of products list 0.356 g to 3 g, the median 1 g.0.8 g

60% of 1,850 products listing glutamine give more (median 1 g).

N-Acetyl-D-Glucosamine800 mgN-Acetyl Glucosamine in GLR-6 against 148 products800 mg per serving; the middle half of products list 79 mg to 500 mg, the median 250 mg.800 mg

Higher than 89% of 148 products listing N-acetyl glucosamine (median 250 mg).

Slippery Elm powder300 mgSlippery Elm in GLR-6 against 232 products300 mg per serving; the middle half of products list 50 mg to 300 mg, the median 150 mg.300 mg

Higher than 74% of 232 products listing slippery elm (median 150 mg).

Marshmallow extract300 mgMarshmallow in GLR-6 against 290 products300 mg per serving; the middle half of products list 50 mg to 224 mg, the median 100 mg.300 mg

Higher than 78% of 290 products listing marshmallow (median 100 mg).

Licoriceas Glycyrrhizic AcidsLicorice (Form: deglycyrrhizinated less than 1% Glycyrrhizic Acids) PlantPart: root Genus: Glycyrrhiza Species: glabra300 mgLicorice in GLR-6 against 888 products300 mg per serving; the middle half of products list 42 mg to 300 mg, the median 100 mg.300 mg

Higher than 74% of 888 products listing licorice (median 100 mg).

Fenugreekas SaponinsFenugreek (Form: standardized to 50% Saponins) PlantPart: seed Genus: Trigonella Species: foenum-graecum250 mgFenugreek in GLR-6 against 628 products250 mg per serving; the middle half of products list 100 mg to 600 mg, the median 300 mg.250 mg

56% of 628 products listing fenugreek give more (median 300 mg).

Source: NIH ODS Dietary Supplement Label Database, label 229801 (entered July 23, 2020), 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 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 Glr-6'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: Take 4 capsules daily.
Allergens and what it does not contain
No Gluten Dairy Soy Wheat GMO Tree nuts Peanuts Eggs Fish Colorings Preservatives Animal derivatives
Storage
Store in a cool dry place with lid closed tightly.

Source: label statements in DSLD label 229801.

What else is on the label?

Other ingredients: Hypromellose, organic Rice, Vitamin C.

How many labels does Glr-6 have?

One label is on file, entered on July 23, 2020.

  1. Label 229801 (current) Entered July 23, 2020 · on the market · 120 capsules · UPC 7 18598 79224 4

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

Who makes it?

The label names Intestinal Fortitude Inc., (manufacturer, distributor), Williamsburg, Virginia. All IF Intestinal Fortitude products.

Where next?