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: 75 · Reference range: 75 – 250 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) (31)
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-Theanine →
| Rank | Product | Per day | Score | Breakdown | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 tie |
L-Theanine 200 mg Vitamin World · US NIH DSLD |
200 mg | 100.0 | Breakdown
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| 1 tie |
Suntheanine L-Theanine 100 mg Swanson · US NIH DSLD |
200 mg | 100.0 | Breakdown
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| 3 tie |
L-Theanine 100 mg The Vitamin Shoppe · US NIH DSLD |
100 mg | 97.8 | Breakdown
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| 3 tie |
L-Theanine 200 mg The Vitamin Shoppe · US NIH DSLD |
200 mg | 97.8 | Breakdown
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| 5 tie |
L-Theanine Douglas Laboratories · US NIH DSLD |
100 mg | 94.4 | Breakdown
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| 5 tie |
L-Theanine 200 mg Puritan's Pride · US NIH DSLD |
200 mg | 94.4 | Breakdown
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| 5 tie |
L-Theanine With Suntheanine 150 mg Doctor's Best · US NIH DSLD |
150 mg | 94.4 | Breakdown
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| 8 | GNC L-Theanine 200mg capsule GNC · Malaysia NPRA |
204 mg | 93.3 | Breakdown
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| 9 | L-Theanine 150 mg Bluebonnet · US NIH DSLD |
150 mg | 92.2 | Breakdown
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| 10 | Theanine 100 Jarrow Formulas Inc. · Health Canada LNHPD |
100 mg | 87.8 | Breakdown
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| 11 tie |
L-Theanine Higher Nature · US NIH DSLD |
100 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine Momentous · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine PureFormulas · US NIH DSLD |
100 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine Prescribed Choice · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine ProThera · US NIH DSLD |
100 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 100 mg Healthy Origins · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 100 mg California Gold Nutrition · US NIH DSLD |
100 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 100 mg Seeking Health · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Woodstock Vitamins · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Sports Research · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg DaVinci Laboratories · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Evlution Nutrition · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg California Gold Nutrition · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Nutricost · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg NutraBio · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Nature's Lab · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Advance Physician Formulas · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Good 'N Natural · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg AN Amazing Nutrition Amazing Formulas · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Double Wood Supplements · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Health Thru Nutrition · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Nutralife · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
L-Theanine 200 mg Nature's Truth · US NIH DSLD |
200 mg | 83.3 | Breakdown
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| 11 tie |
Suntheanine Revive · US NIH DSLD |
100 mg | 83.3 | Breakdown
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| 35 tie |
L-Theanine Whole Foods · US NIH DSLD |
200 mg | 81.1 | Breakdown
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| 35 tie |
L-Theanine Metabolic Maintenance · US NIH DSLD |
200 mg | 81.1 | Breakdown
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| 35 tie |
L-Theanine 100 mg PhysioLogics · US NIH DSLD |
100 mg | 81.1 | Breakdown
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| 35 tie |
L-Theanine 200 mg Amazon Elements · US NIH DSLD |
200 mg | 81.1 | Breakdown
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| 39 tie |
COLLAWELL® L-Theanine 100mg Capsule Collawell · Malaysia NPRA |
100 mg | 76.7 | Breakdown
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| 39 tie |
Calm-Pro Bioclinic Naturals Inc. · Health Canada LNHPD |
100 mg | 76.7 | Breakdown
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| 39 tie |
Focus L-Theanine SISU · Health Canada LNHPD |
250 mg | 76.7 | Breakdown
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| 39 tie |
L Theanine | 200 mg | 76.7 | Breakdown
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| 39 tie |
L-Theanine Sports Research · Health Canada LNHPD |
200 mg | 76.7 | Breakdown
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| 39 tie |
L-Theanine Designs for Health Ltd. · Health Canada LNHPD |
200 mg | 76.7 | Breakdown
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| 39 tie |
L-Theanine Rhema Health Products Limited · Health Canada LNHPD |
200 mg | 76.7 | Breakdown
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| 39 tie |
L-Theanine (Suntheanine®) 1123573 BC Ltd. · Health Canada LNHPD |
100 mg | 76.7 | Breakdown
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| 39 tie |
L-Theanine Gummies New Nordic Inc. · Health Canada LNHPD |
100 mg | 76.7 | Breakdown
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| 39 tie |
L-Théanine Les Entreprises Gamma Force Inc. · Health Canada LNHPD |
250 mg | 76.7 | Breakdown
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| 39 tie |
Nova L-Theanine 200mg Capsule Nova · Malaysia NPRA |
200 mg | 76.7 | Breakdown
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| 39 tie |
STRESSfree Shot ZAC Enterprise Marketing · Health Canada LNHPD |
200 mg | 76.7 | Breakdown
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75 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.