Best L-Glutamine products by transparent scoring (2026)
Single-ingredient products scored by public rules: dose fit, label transparency, data verification, company transparency, third-party testing. Not a measure of efficacy or safety. No paid placement.
Products ranked: 150 · Reference range: 500 – 9,000 mg (source) · Updated 2026-11-01
Reference range: derived from the cited reference values; see the methodology.
Single-ingredient products only.
Left out of this list: combination products (a single-ingredient list exists) (7)
Dose fit 40 · Label transparency 20 · Data verification 15 · Company transparency 15 · Third-party test 10 (No data (not scored); the other four parts are rescaled from 90 to 100) — Methodology · L-Glutamine →
| Rank | Product | Per day | Score | Breakdown | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 tie |
L-Glutamine Twinlab · US NIH DSLD |
500 mg | 100.0 | Breakdown
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| 1 tie |
L-Glutamine XYMOGEN · US NIH DSLD |
4,000 mg | 100.0 | Breakdown
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| 1 tie |
L-Glutamine Nature's Sunshine · US NIH DSLD |
1,000 mg | 100.0 | Breakdown
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| 1 tie |
L-Glutamine 1000 MET-Rx · US NIH DSLD |
4,000 mg | 100.0 | Breakdown
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| 1 tie |
L-Glutamine 500 mg Spring Valley · US NIH DSLD |
4,000 mg | 100.0 | Breakdown
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| 1 tie |
L-Glutamine Powder MET-Rx · US NIH DSLD |
6,000 mg | 100.0 | Breakdown
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| 1 tie |
L-Glutamine Powder 4500 mg The Vitamin Shoppe · US NIH DSLD |
4,500 mg | 100.0 | Breakdown
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| 8 | L-Glutamine 500 mg Vitamin World · US NIH DSLD |
1,000 mg | 97.8 | Breakdown
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| 9 tie |
L-Glutamine 1000 mg Solgar · US NIH DSLD |
4,000 mg | 94.4 | Breakdown
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| 9 tie |
L-Glutamine 500 mg Solgar · US NIH DSLD |
4,500 mg | 94.4 | Breakdown
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| 9 tie |
L-Glutamine 500 mg Puritan's Pride · US NIH DSLD |
4,000 mg | 94.4 | Breakdown
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| 9 tie |
L-Glutamine Powder Bluebonnet · US NIH DSLD |
5,000 mg | 94.4 | Breakdown
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| 9 tie |
L-Glutamine Powder Carlson · US NIH DSLD |
3,000 mg | 94.4 | Breakdown
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| 9 tie |
L-Glutamine Powder Jarrow Formulas · US NIH DSLD |
2,000 mg | 94.4 | Breakdown
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| 15 tie |
GLUTAMINE Empire Health Distribution Inc. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
GLUTAPURE Empire Health Distribution Inc. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
GNC L-Glutamine 1000 Tablet GNC · Malaysia NPRA |
1,000 mg | 93.3 | Breakdown
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| 15 tie |
Glutamine Powder Healthy Body Services Inc. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
L-Glutamine Prairie Naturals Health Products Inc. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
L-Glutamine Designs for Health · Health Canada LNHPD |
850 mg | 93.3 | Breakdown
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| 15 tie |
L-Glutamine Platinum Naturals Ltd. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
L-Glutamine GFR Pharma Ltd. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
L-Glutamine New Roots Herbal Inc. · Health Canada LNHPD |
500 mg | 93.3 | Breakdown
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| 15 tie |
L-Glutamine Powder Designs for Health · Health Canada LNHPD |
3,000 mg | 93.3 | Breakdown
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| 15 tie |
LABRADA CREALEAN Empire Health Distribution Inc. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 15 tie |
NOW L-Glutamine 1000 mg NOW Health Group, Inc. · Health Canada LNHPD |
1,000 mg | 93.3 | Breakdown
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| 15 tie |
Now L-Glutamine Powder NOW Health Group, Inc. · Health Canada LNHPD |
3,000 mg | 93.3 | Breakdown
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| 15 tie |
Platinum Naturals L- Glutamine Platinum Naturals Ltd. · Health Canada LNHPD |
500 mg | 93.3 | Breakdown
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| 15 tie |
Prairie Naturals L-Glutamine Prairie Naturals Health Products Inc. · Health Canada LNHPD |
500 mg | 93.3 | Breakdown
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| 15 tie |
Prairie Naturals L-Glutamine Powder Prairie Naturals Health Products Inc. · Health Canada LNHPD |
5,000 mg | 93.3 | Breakdown
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| 31 tie |
L-Glutamine Carlson · US NIH DSLD |
3,000 mg | 92.2 | Breakdown
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| 31 tie |
L-Glutamine 500 mg Bluebonnet · US NIH DSLD |
500 mg | 92.2 | Breakdown
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| 33 tie |
L-Glutamine Jarrow Formulas Inc. · Health Canada LNHPD |
2,000 mg | 87.8 | Breakdown
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| 33 tie |
L-Glutamine Thorne Research, Inc. · Health Canada LNHPD |
500 mg | 87.8 | Breakdown
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| 33 tie |
L-Glutamine 1000 Jarrow Formulas Inc. · Health Canada LNHPD |
1,000 mg | 87.8 | Breakdown
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| 36 tie |
100% Pure L-Glutamine 5000 ANSI Pro-Series · US NIH DSLD |
5,000 mg | 83.3 | Breakdown
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| 36 tie |
GAKG NutraBio · US NIH DSLD |
6,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine Klaire Labs · US NIH DSLD |
500 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine NutriCology · US NIH DSLD |
3,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine SuperSmart · US NIH DSLD |
3,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine Momentous · US NIH DSLD |
5,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine Pure · US NIH DSLD |
970 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine AN Amazing Nutrition Amazing Formulas · US NIH DSLD |
1,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine BulkSupplements.com · US NIH DSLD |
5,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine Source Naturals · US NIH DSLD |
2,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine GNC Pro Performance · US NIH DSLD |
1,500 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine 1000 MRM · US NIH DSLD |
3,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine 1000 mg NusaPure · US NIH DSLD |
1,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine 1500 mg NOW Sports · US NIH DSLD |
6,000 mg | 83.3 | Breakdown
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| 36 tie |
L-Glutamine 5 grams GNC Beyond Raw Chemistry Labs · US NIH DSLD |
5,000 mg | 83.3 | Breakdown
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100 products were scored; the top 50 are listed here. See the rest in the product list.
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.