Subjective effects of glycine ingestion before bedtime on sleep quality
Inagawa K, Hiraoka T, Kohda T, Yamadera W, Takahashi M
Published in Sleep and Biological Rhythms
Methodology
Randomised double-blind crossover trial of 3 g glycine versus placebo before bedtime in adults with subjective sleep complaints
Key Findings
Glycine significantly improved subjective sleep quality and reduced fatigue and daytime sleepiness on the Pittsburgh Sleep Quality Index and visual analogue scales.
Conclusions
Bedtime glycine 3 g improves self-reported sleep quality in people with mild sleep complaints.
Limitations
Small sample, subjective endpoints, conducted by supplement manufacturer employees.
Supplements Studied
Subjects who took 3 g glycine before bedtime reported significantly improved sleep quality and reduced daytime sleepiness and fatigue.
Related Health Concerns
Study Details
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.