AMINO ACID
L-Glycine — 3000 mg
Lowers core body temperature to ease the transition into deep, restorative sleep.
Benefits
Glycine is an inhibitory amino acid that lowers core body temperature and supports the transition into deep sleep. It enhances parasympathetic tone and increases the proportion of restorative slow-wave sleep (SWS).
- Sleep latency — Decreases ↓
- Slow-wave sleep — Increases ↑
- Alertness — Improves ↑
- Parasympathetic — Enhances ↑
The science
It's one of the few nutrients with consistent human data for improving sleep quality when taken right before bed.
- In a randomized trial, 3g glycine before bed improved subjective sleep quality and shortened sleep latency in individuals with poor sleep (PubMed: 20347397).
- Another study found glycine improved next-day alertness and reduced fatigue after sleep restriction (PubMed: 20347397).
- Mechanistic studies show glycine's role in thermoregulation and circadian signaling (PubMed: 11510825).
