GABA (Supplement) and L-Theanine
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
GABA (Supplement)
The brain's calming neurotransmitter in a pill — which mostly can't cross into the brain.
Grade D1 graded outcomerevised 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.
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.
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 GABA (Supplement)
- Relaxation / stress Trivial effectEvidence grade D
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
What each entry says about the other
- GABA (Supplement)’s entry · Works together: Sometimes combined for calm; theanine is better supported.
- GABA (Supplement)’s entry · Goes with: Sometimes combined for calm; theanine is better supported.
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.