Medical disclaimer: CalmVerdict summarizes what people say about supplements on Reddit. It is not medical advice, and nothing here is meant to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration. Talk to your doctor or pharmacist before starting a supplement, especially if you take an antidepressant or other medicine, are pregnant, or have a medical condition. Do not stop or change prescribed medicine on your own. If you are in crisis or thinking about suicide, call or text 988 (US) or your local emergency number. Full disclaimer.

L-theanine vs GABA

On Reddit, owners rate L-theanine higher overall (4.0 vs 3.1). Scores summarize self-reported experiences and are not evidence that either will work for you.

L-theanineGABA
Typecapsulescapsules
CalmVerdict score4.03.1
Owner sentiment3.53.2
Recommendations4.81.0
Tolerability4.44.2
Owner comments33040
Rated comments19625
Unwanted effects reported14%16%
Top praiseCalming effect, Dose & timingCalming effect, Dose & timing
Top complaintsSide effects, Calming effectSide effects, Mood

By concern

ContextL-theanineGABA
Anxiety & worry35 of 71 positive6 of 10 positive
Low mood13 of 30 positive1 of 5 positive
Everyday stress25 of 52 positive3 of 7 positive
Panic attacks11 of 20 positiveToo few comments
Rumination & intrusive thoughts2 of 4 positiveToo few comments
Physical tension3 of 7 positiveToo few comments

What owners say about L-theanine

2/5 Calming effect

“Theanine, because I had tried it for evening calm and it didn't do anything for me.”

owner comment via r/Supplements · 2026-08-05 · 50 upvotes
4/5 Calming effectTaste & form

“The I found a liquid L theanine and that made all the difference in the world.”

owner comment via r/Supplements · 2026-09-12 · 13 upvotes
4/5 Calming effectFalling asleep

“l-theanine is the only one that's worked for me.”

owner comment via r/Nootropics · 2026-09-17 · 12 upvotes

Full L-theanine page →

What owners say about GABA

1/5 Calming effectFalling asleep

“Just want to touch base on the GABA part.”

owner comment via r/Nootropics · 2026-08-22 · 11 upvotes
4/5 Calming effect

“I've tried GABA and even though it did make me feel more relaxed I wasn't very talkative at all.”

owner comment via r/Nootropics · 2026-06-19 · 4 upvotes
4/5 Calming effect

“Standard GABA is usually synthetically produced via chemical synthesis using industrial solvents and precursors.”

owner comment via r/Supplements · 2026-09-12 · 1 upvotes

Full GABA page →

Talk to a doctor or pharmacist before switching or combining supplements, particularly if you take other medicines.