NutraBio · L-glutamine · Powder
Is NutraBio Glutamine underdosed?
1 serving = 1 scoop (5 g)Directions: 2–3 servings a dayLabel as of 24 Apr 2025 · NIH DSLD
Verdict
10–15 g a dayas the label directs
Not gradedContains 15 g. Not graded: the ISSN's 2018 review lists glutamine among supplements with little to no evidence of working, for building muscle and for performance.
One serving gives 5 g.
What the label says
- L-Glutamine per serving
- 5 g in 1 scoop (5 g)
- Servings a day
- 2–3 servings a day
- L-Glutamine a day, as directed
- 10–15 g
- Research dose
- Not graded Evidence: Not graded
Suggested use: Take 1 level scoop (5 g) mixed with your favorite beverage 2 to 3 times daily. On training days take first serving 20 minutes prior to workout, second serving immediately following workout, second serving immediately following workout, and an optional third serving before sleep. On non-training days, space your servings evenly throughout the day with your last serving before sleep. For optimum results take in conjunction with NutraBio Creatine and Whey Protein Isolate.
More about l-glutamine: forms, timing and the studies behind the dose.
Same category, compared
All 17 L-glutamine supplements we checked, ranked by dose (commission never changes the order).
| Product | Per serving | Form |
|---|---|---|
| BulkSupplements.com L-Glutamine Powder | 5 g | Powders |
| Doctor's Best Pure L-Glutamine Powder | 5 g | Powders |
| Jarrow Formulas L-Glutamine 1000 mg | 1 g | Tablets |
| Kaged Glutamine | 5 g | Powders |
| Klean Athlete Klean Glutamine | 5 g | Powders |
| Micro Ingredients Glutamine Powder | 3 g | Powders |
| Momentous L-Glutamine | 5 g | Powders |
| MuscleTech Platinum 100% Glutamine | 5 g | Powders |
| NOW Sports L-Glutamine Powder | 5 g | Powders |
| NutraBio Glutamine (this product) | 5 g | Powders |
| Nutricost L-Glutamine 800 mg | 800 mg | Capsules |
| Nutricost L-Glutamine Powder | 5 g | Powders |
| Optimum Nutrition Glutamine Powder | 5 g | Powders |
| Pure Encapsulations L-Glutamine Powder | 3 g | Powders |
| Sports Research L-Glutamine | 5 g | Powders |
| Swanson L-Glutamine 500 mg | 500 mg | Capsules |
| Thorne L-Glutamine | 500 mg | Capsules |
Where the reference doses come from
- L-Glutamine, : .
- Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 329377, including its servings a day.
For a supplement taken every day we judge the most the label's directions give in a day, and show the least. Read the full methodology or the corrections log.