Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes
Yamadera W, Inagawa K, Chiba S, Bannai M, Takahashi M, Nakayama K
Published in Sleep and Biological Rhythms
Methodology
Randomised double-blind crossover polysomnography study of 3 g glycine before bed in volunteers with insomnia tendencies
Key Findings
Glycine shortened latency to sleep onset and to slow-wave sleep without altering sleep architecture, alongside improved subjective sleep quality.
Conclusions
Glycine speeds sleep onset and improves perceived sleep quality with objective polysomnographic correlates.
Limitations
Very small sample; manufacturer-affiliated authors; single-night exposure.
Supplements Studied
Glycine ingestion before bedtime shortened the latency to sleep onset and to slow-wave sleep, with improved subjective sleep quality.
Outcomes Measured
Glycine shortened the latency to sleep onset and to slow-wave sleep.
Glycine improved subjective sleep quality with polysomnographic shortening of sleep onset latency.
Glycine shortened latency to sleep onset and to slow-wave sleep without altering sleep architecture, alongside improved subjective sleep quality.
Related Health Concerns
Study Details
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