PlainVitamins

L-Glutamine + FOS Powder

by Douglas Laboratories · powder · 250 grams

  • On the market (NIH)
  • UPC 3 10539 01860 6
  • DSLD label 30650
  • Serving 1 tsp (approx. 4 grams)
  • 62 servings

L-Glutamine + FOS Powder by Douglas Laboratories lists 2 ingredients, 2 with an amount per serving of 1 tsp, such as 2.5 g of L-glutamine and 1.5 g of fos, beside 1 Nutrition Facts row (calories, fat and the like). Its current label entered the NIH Dietary Supplement Label Database on February 26, 2014.

What is in L-Glutamine + FOS Powder?

Each row as the label prints it, per serving of 1 tsp. 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).

L-Glutamine + FOS Powder: Supplement Facts rows against the market (DSLD label 30650, January 2026 release)
IngredientAmount% DVAmong products listing it
Total Carbohydrates1.5 g1%Carbohydrate in L-Glutamine + FOS Powder against 21,979 products1.5 g per serving; the middle half of products list 1 g to 6 g, the median 3 g.1.5 g

73% of 21,979 products listing carbohydrate give more (median 3 g). Per day at the most servings: 3 g.

L-Glutamine2.5 gGlutamine in L-Glutamine + FOS Powder against 1,850 products2.5 g per serving; the middle half of products list 0.356 g to 3 g, the median 1 g.2.5 g

Higher than 62% of 1,850 products listing glutamine (median 1 g). Per day at the most servings: 5 g.

Fos1.5 gFructo-Oligosaccharides in L-Glutamine + FOS Powder against 526 products1,500 mg per serving; the middle half of products list 75 mg to 500 mg, the median 185 mg.1,500 mg

Higher than 89% of 526 products listing fructo-oligosaccharides (median 185 mg). Per day at the most servings: 3,000 mg.

Source: NIH ODS Dietary Supplement Label Database, label 30650 (entered February 26, 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 2 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 L-Glutamine + FOS Powder'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 mix 1 teaspoon (approx. 4 grams) in water or juice, twice daily or as directed by physician.
Warnings
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, 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 30650.

How many labels does L-Glutamine + FOS Powder 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 30650 (current) Entered February 26, 2014 · on the market · 250 grams · UPC 3 10539 01860 6
  2. Label 9903 Entered June 25, 2012 · off the market July 31, 2013 · 250 grams · UPC 3 10539 01860 6
  3. Label 5366 Entered February 23, 2012 · off the market January 20, 2012 · 250 g · UPC 3 10539 01860 6

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?