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L-Theanine
Full ranking Dose tool Products (764)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Authoritative daily maximum: 250 mg
Median（Per day）150 mgP5 25 – P95 300
Products764
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=l.theanine2&lang=eng · Health Canada NNHPD monograph: 200-250 mg L-theanine/day
Daily dose across products（mg/day）
Authoritative daily maximum 250
15 mglog scale · n=7641,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Vitamin World | L-Theanine 200 mg | 200 mg | 90.0 |
| 1 | Vitamin World | L-Theanine 200 mg Natural Mint Flavor | 200 mg | 90.0 |
| 1 | Swanson | Suntheanine L-Theanine 100 mg | 200 mg | 90.0 |
| 4 | The Vitamin Shoppe | L-Theanine 100 mg | 100 mg | 88.0 |
| 4 | The Vitamin Shoppe | L-Theanine 200 mg | 200 mg | 88.0 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.