Reality Index data · Comparison
GABA vs Glycine for Sleep
Both scored across 244 Reddit threads in our October dataset (1,645 posts total, 5 communities, outcome-language scoring). Here's how they actually compare — numbers first, verdict after.
| GABA | Glycine | |
|---|---|---|
| User approval | 79% | 97% |
| Threads mentioning it | 188 | 56 |
| Upvotes on those threads | 13,612 | 10,649 |
| Positive outcome posts | 96 | 29 |
| Negative outcome posts | 26 | 1 |
| Avg upvotes per thread | 72 | 190 |
The verdict, by the numbers
Glycine wins on approval — 97% vs 79% , a decisive 18-point gap. On conversation volume, GABA dominates: 13,612 upvotes of engagement versus 10,649. Note the split: the louder conversation is not the better-loved one — worth knowing before you follow the hype.
Fit beats ranking, though. GABA is the better match if your problem is little — most can't cross into the brain. Glycine fits deep, shallow sleep and morning grogginess. If you're unsure which problem you actually have, the 60-second Finder quiz sorts it.
“L-Theanine is changing my life. L-Theanine is changing my life I know the title may seem dramatic, but I am so serious. Last week, I went through a pretty rough” — top GABA thread, 682 upvotes
“Here's what ACTUALLY helps me sleep:. Here's what ACTUALLY helps me sleep: What's up sleep hustlers, hope you got some sleep. A little about me. I am a female i” — top Glycine thread, 523 upvotes
Read the full breakdowns
GABA: the honest guide →
Glycine: the honest guide →
Both in the full ranked comparison →
Self-reported community sentiment (October 2026 edition, methodology on the Reality Index report) — expectations data, not clinical proof.