L-Theanine and Sleep quality: what the evidence supports
Each entry’s own grades, side by side. A grade says how strong the evidence is for one outcome — it does not rank one entry over the other.
Compound or practice
L-Theanine
The calm in green tea — pairs with caffeine to keep the focus and drop the jitter.
Grade B3 graded outcomesrevised Jul 10, 2026
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
Outcome map
Sleep quality: what the evidence supports
6 graded interventions for sleep quality, ranked by strength of evidence.
Grade C6 graded outcomesrevised Jul 10, 2026
Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.
Graded in both
Outcomes are matched by name. Two entries can describe the same outcome in different words, so one listed further down may still be graded in the other.
No outcome has the same name in both entries. They may still overlap under different wording — read the two lists below.
Graded only in L-Theanine
- Attention (with caffeine) Moderate effectEvidence grade B
- Acute stress / anxiety Small effectEvidence grade B
- Sleep quality Small effectEvidence grade C
Graded only in Sleep quality: what the evidence supports
- L-Theanine Small effectEvidence grade C
- Tart Cherry Small effectEvidence grade C
- Passionflower Small effectEvidence grade C
- Lemon Balm Small effectEvidence grade C
- Hops Small effectEvidence grade C
- Ziziphus (Jujube / Suanzaoren) Small effectEvidence grade C
What each entry says about the other
- Sleep quality: what the evidence supports’s entry · Goes with: Grade C
Both columns are read from the entries as they stand in this library. A comparison is not advice to take either one, and it is no substitute for a clinician who knows the person.