Reality Index data · Comparison
5-HTP vs Glycine for Sleep
Both scored across 213 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.
| 5-HTP | Glycine | |
|---|---|---|
| User approval | 84% | 97% |
| Threads mentioning it | 157 | 56 |
| Upvotes on those threads | 5,222 | 10,649 |
| Positive outcome posts | 78 | 29 |
| Negative outcome posts | 15 | 1 |
| Avg upvotes per thread | 33 | 190 |
The verdict, by the numbers
Glycine wins on approval — 97% vs 84% , a decisive 13-point gap. On conversation volume, Glycine dominates: 10,649 upvotes of engagement versus 5,222. Approval and attention point the same direction here.
Fit beats ranking, though. 5-HTP is the better match if your problem is mood-adjacent sleep issues (thin evidence). Glycine fits deep, shallow sleep and morning grogginess. If you're unsure which problem you actually have, the 60-second Finder quiz sorts it.
“I Tried 15+ Supplements for Better Sleep & Recovery - Here's What Actually Moved the Needle. I Tried 15+ Supplements for Better Sleep & Recovery - Here's What A” — top 5-HTP thread, 321 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
5-HTP: 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.