Head to head
Glycine vs Melatonin
On the strength of human evidence, Melatonin comes out ahead (evidence 55 vs 48). But they're often used for different things — read each claim before deciding.
Glycine
Limitedthe quiet, cheap sleep amino acid
Marketing intensity 42 of 100. Evidence strength 48 of 100. Verdict: Hype ≈ evidence.
Under-marketed and reasonably promising for sleep. The longevity buzz, though, is built almost entirely on worms and mice.
Full evidence on Glycine →Melatonin
Moderatea timing cue, not a sleeping pill
Marketing intensity 85 of 100. Evidence strength 55 of 100. Verdict: Overhyped.
A circadian signal that helps you shift when you sleep. It is not a sedative, and most people take far too much.
Full evidence on Melatonin →Side by side
| Metric | Glycine | Melatonin |
|---|---|---|
| Overall tier | Limited | Moderate |
| Evidence score | 48/100 | 55/100 |
| Hype score | 42/100 | 85/100 |
| Verdict | Hype ≈ evidence | Overhyped |
| Safety concern | low | moderate |
Quick answers
Glycine or Melatonin — which has better evidence?
On the strength of human evidence, Melatonin comes out ahead (evidence 55 vs 48). But they're often used for different things — read each claim before deciding.
Can you take Glycine and Melatonin together?
This page compares the evidence, not interactions. Some supplements interact with each other or with medications — check each one's safety section and talk to a pharmacist before stacking.