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Best L-Theanine 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: 106 · Reference range: 75 – 250 mg (source) · Updated 2026-10-30
Dose fit 40 · Label transparency 20 · Data verification 15 · Company transparency 15 · Third-party test 10 — Methodology · L-Theanine →
| Rank | Product | Per day | Score | Breakdown | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 tie |
L-Theanine 200 mg Vitamin World · US NIH DSLD |
200 mg | 90.0 | Breakdown
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| 1 tie |
L-Theanine 200 mg Natural Mint Flavor Vitamin World · US NIH DSLD |
200 mg | 90.0 | Breakdown
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| 1 tie |
Suntheanine L-Theanine 100 mg Swanson · US NIH DSLD |
200 mg | 90.0 | Breakdown
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| 4 tie |
L-Theanine 100 mg The Vitamin Shoppe · US NIH DSLD |
100 mg | 88.0 | Breakdown
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| 4 tie |
L-Theanine 200 mg The Vitamin Shoppe · US NIH DSLD |
200 mg | 88.0 | Breakdown
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| 6 tie |
L-Theanine Douglas Laboratories · US NIH DSLD |
100 mg | 85.0 | Breakdown
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| 6 tie |
L-Theanine 100 mg Mint Flavored Country Life · US NIH DSLD |
100 mg | 85.0 | Breakdown
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| 6 tie |
L-Theanine 200 mg Country Life · US NIH DSLD |
200 mg | 85.0 | Breakdown
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| 6 tie |
L-Theanine 200 mg Puritan's Pride · US NIH DSLD |
200 mg | 85.0 | Breakdown
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| 6 tie |
L-Theanine With Suntheanine 150 mg Doctor's Best · US NIH DSLD |
150 mg | 85.0 | Breakdown
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| 11 tie |
GNC L-Theanine 200mg capsule GNC · Malaysia NPRA |
204 mg | 84.0 | Breakdown
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| 11 tie |
L-Theanine NutraChamps Inc. · Health Canada LNHPD |
200 mg | 84.0 | Breakdown
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| 11 tie |
NutraChamps L-Theanine NutraChamps Inc. · Health Canada LNHPD |
200 mg | 84.0 | Breakdown
|
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| 14 tie |
L-Theanine 150 mg Bluebonnet · US NIH DSLD |
150 mg | 83.0 | Breakdown
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| 14 tie |
L-Theanine Complex Solgar · US NIH DSLD |
240 mg | 83.0 | Breakdown
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| 16 | Theanine 100 Jarrow Formulas Inc. · Health Canada LNHPD |
100 mg | 79.0 | Breakdown
|
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| 17 tie |
Apigenin 50 mg with L-Theanine aSquared Nutrition · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine Higher Nature · US NIH DSLD |
100 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine Momentous · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine PureFormulas · US NIH DSLD |
100 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine Prescribed Choice · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine ProThera · US NIH DSLD |
100 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 100 mg Healthy Origins · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 100 mg California Gold Nutrition · US NIH DSLD |
100 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 100 mg Seeking Health · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg Woodstock Vitamins · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg Sports Research · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg DaVinci Laboratories · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg Evlution Nutrition · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg California Gold Nutrition · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Nutricost · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg NutraBio · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Nature's Lab · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg Advance Physician Formulas · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Good 'N Natural · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg AN Amazing Nutrition Amazing Formulas · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Double Wood Supplements · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Health Thru Nutrition · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Longevity Medical Clinic · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Nutralife · US NIH DSLD |
200 mg | 75.0 | Breakdown
|
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| 17 tie |
L-Theanine 200 mg Nature's Truth · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine 200 mg Plus Gaba 100 mg Dr. Mercola · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
L-Theanine Calm Caps Nature's Truth · US NIH DSLD |
200 mg | 75.0 | Breakdown
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| 17 tie |
Liposomal L-Theanine Natural Rhythm · US NIH DSLD |
100 mg | 75.0 | Breakdown
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| 17 tie |
PRO-Mood with l-theanine Hyperbiotics · US NIH DSLD |
100 mg | 75.0 | Breakdown
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| 17 tie |
Suntheanine Revive · US NIH DSLD |
100 mg | 75.0 | Breakdown
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| 47 tie |
L-Theanine Whole Foods · US NIH DSLD |
200 mg | 73.0 | Breakdown
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| 47 tie |
L-Theanine Metabolic Maintenance · US NIH DSLD |
200 mg | 73.0 | Breakdown
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| 47 tie |
L-Theanine 100 mg NOW · US NIH DSLD |
200 mg | 73.0 | Breakdown
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| 47 tie |
L-Theanine 100 mg PhysioLogics · US NIH DSLD |
100 mg | 73.0 | Breakdown
|
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| 47 tie |
L-Theanine 200 mg Amazon Elements · US NIH DSLD |
200 mg | 73.0 | Breakdown
|
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| 52 tie |
COLLAWELL® L-Theanine 100mg Capsule Collawell · Malaysia NPRA |
100 mg | 69.0 | Breakdown
|
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| 52 tie |
Calm-Pro Bioclinic Naturals Inc. · Health Canada LNHPD |
100 mg | 69.0 | Breakdown
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| 52 tie |
Focus L-Theanine SISU · Health Canada LNHPD |
250 mg | 69.0 | Breakdown
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| 52 tie |
L Theanine | 200 mg | 69.0 | Breakdown
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| 52 tie |
L-Theanine Sports Research · Health Canada LNHPD |
200 mg | 69.0 | Breakdown
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| 52 tie |
L-Theanine Designs for Health Ltd. · Health Canada LNHPD |
200 mg | 69.0 | Breakdown
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| 52 tie |
L-Theanine Rhema Health Products Limited · Health Canada LNHPD |
200 mg | 69.0 | Breakdown
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| 52 tie |
L-Theanine (Suntheanine®) 1123573 BC Ltd. · Health Canada LNHPD |
100 mg | 69.0 | Breakdown
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| 52 tie |
L-Theanine Gummies New Nordic Inc. · Health Canada LNHPD |
100 mg | 69.0 | Breakdown
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| 52 tie |
L-Théanine Les Entreprises Gamma Force Inc. · Health Canada LNHPD |
250 mg | 69.0 | Breakdown
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| 52 tie |
Nova L-Theanine 200mg Capsule Nova · Malaysia NPRA |
200 mg | 69.0 | Breakdown
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| 52 tie |
STRESSfree Shot ZAC Enterprise Marketing · Health Canada LNHPD |
200 mg | 69.0 | Breakdown
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| 52 tie |
Zen Theanine Advanced Orthomolecular Research Inc. · Health Canada LNHPD |
225 mg | 69.0 | Breakdown
|
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| 65 tie |
Serenelle With Pharmagaba, Sensoril, Relesse & L-Theanine Quality of Life Labs, LLC · Health Canada LNHPD |
100 mg | 65.0 | Breakdown
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| 65 tie |
Suntheanine Veggie Capsules Master Supplements · Brand website |
150 mg | 65.0 | Breakdown
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| 67 | L-Theanine with Green Tea Naka Herbs & Vitamins Ltd. · Health Canada LNHPD |
100 mg | 64.3 | Breakdown
|
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| 68 | L-Theanine, 200 mg, 60 Vegetable Capsules Advance Physician Formulas · Brand website |
200 mg | 64.0 | Breakdown
|
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| 69 tie |
NUTRILIVING L-THEANINE WITH MAGNESIUM GLYCINATE TABLET Nutriliving · Malaysia NPRA below_ref |
50 mg | 55.7 | Breakdown
|
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| 69 tie |
VITASEN Mg-L-Theanine Tablet Vitasen · Malaysia NPRA below_ref |
50 mg | 55.7 | Breakdown
|
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| 71 | L-Theanine XYMOGEN · US NIH DSLD above_upper |
800 mg | 47.0 | Breakdown
|
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| 72 | Theanine Thorne · US NIH DSLD above_upper |
600 mg | 45.0 | Breakdown
|
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| 73 | L-Theanine 150 mg Solgar · US NIH DSLD above_upper |
300 mg | 43.0 | Breakdown
|
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| 74 | L-Theanine Pure Encapsulations · US NIH DSLD above_upper |
1,200 mg | 42.0 | Breakdown
|
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| 75 tie |
Double Strength L-Theanine 200 mg NOW · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
|
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| 75 tie |
L-Theanine Dr. Berg · US NIH DSLD above_upper |
600 mg | 35.0 | Breakdown
|
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| 75 tie |
L-Theanine SuperiorLabs · US NIH DSLD above_upper |
500 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine NutraBio · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine NuMedica · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine Integrative Therapeutics · US NIH DSLD above_upper |
300 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine BRI Nutrition · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine SmarterVitamins · US NIH DSLD above_upper |
500 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine Ortho Molecular Products · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
|
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| 75 tie |
L-Theanine Hard Rhino · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine & Caffeine Nutriana · US NIH DSLD above_upper |
800 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine + Caffeine Sports Research · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine 100 mg Meijer · US NIH DSLD above_upper |
300 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine 200 mg Source Naturals Serene Science · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine 200 mg Best Naturals · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine 200 mg Capsules BulkSupplements.com · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine 200 mg Unflavored Nutricost · US NIH DSLD above_upper |
600 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine 250 mg Arazo Nutrition · US NIH DSLD above_upper |
500 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine Extra Strength BRI Nutrition · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 75 tie |
L-Theanine Liquid NuMedica · US NIH DSLD above_upper |
400 mg | 35.0 | Breakdown
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| 95 tie |
Chewable L-Theanine 100 mg NOW · US NIH DSLD above_upper |
300 mg | 33.0 | Breakdown
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| 95 tie |
L-Theanine Enzymatic Therapy · US NIH DSLD above_upper |
300 mg | 33.0 | Breakdown
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| 95 tie |
L-Theanine 200 mg Protocol for Life Balance · US NIH DSLD above_upper |
400 mg | 33.0 | Breakdown
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| 95 tie |
L-Theanine 200 mg Source Naturals · US NIH DSLD above_upper |
400 mg | 33.0 | Breakdown
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| 99 tie |
L-Theanine NOW · US NIH DSLD above_upper |
285 mg | 32.0 | Breakdown
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| 99 tie |
L-Theanine Pure · US NIH DSLD above_upper |
355 mg | 32.0 | Breakdown
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For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.