Research · Randomized controlled trial
Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes
What it found
Glycine improved subjective sleep quality and shortened polysomnographic latency to sleep onset and to slow-wave sleep, without changing overall sleep architecture; a small early study.
- Design
- Randomized controlled trial
- Year
- 2007
- Population
- adult volunteers with continuously unsatisfactory sleep (small crossover)
- Intervention
- glycine 3 g before bedtime vs placebo
- Outcome
- subjective sleep quality and polysomnography
- Journal
- Sleep and Biological Rhythms
Citation last checked 2026-06-21.