Back to Study: Glycine ingestion improves subjective sleep qualit...
causal
positive effect
Taking 3 grams of glycine before bed helps people spend more time actually sleeping while in bed, rather than lying awake.
Scientific Claim
A single 3g dose of glycine before bedtime significantly improves subjective sleep efficacy (ratio of sleep time to time in bed) in adults with chronic poor sleep (P=0.018).
Source Excerpt
“glycine significantly increased the subjective sleep efficacy (ratio of sleep time to the whole time in bed, P=0.018, Fig. 2c)”
Evidence from Studies
Supporting Studies
Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes
Crossover Trial
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Evidence Assessment
Supported
The study measured subjective sleep efficacy as the ratio of sleep time to time in bed and found a statistically significant improvement (P=0.018) after glycine ingestion compared to placebo in a randomized crossover design. This provides causal evidence for glycine's effect on sleep efficiency.