Head to head
Glycine vs Valerian root
On the strength of human evidence, Glycine comes out ahead (evidence 48 vs 40). 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 →Valerian root
Limitedthe old-school sleep herb with shaky data
Marketing intensity 58 of 100. Evidence strength 40 of 100. Verdict: Slightly overhyped.
People feel it helps them sleep, and meta-analyses pick up a subjective benefit - but it disappears on objective sleep measures, and the trials are messy.
Full evidence on Valerian root →Side by side
| Metric | Glycine | Valerian root |
|---|---|---|
| Overall tier | Limited | Limited |
| Evidence score | 48/100 | 40/100 |
| Hype score | 42/100 | 58/100 |
| Verdict | Hype ≈ evidence | Slightly overhyped |
| Safety concern | low | low |
Quick answers
Glycine or Valerian root — which has better evidence?
On the strength of human evidence, Glycine comes out ahead (evidence 48 vs 40). But they're often used for different things — read each claim before deciding.
Can you take Glycine and Valerian root 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.