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correlational
positive effect
Taking 3 grams of glycine before bed might help people who have trouble sleeping feel like they slept better and fall asleep faster.
Scientific Claim
In individuals with chronic poor sleep quality, ingestion of 3 grams of glycine before bedtime was associated with improved subjective sleep quality and reduced sleep latency, as measured by polysomnography.
Source Excerpt
“Glycine improved subjective sleep quality and sleep efficacy (sleep time/in-bed time), and shortened PSG latency both to sleep onset and to slow wave sleep without changes in the sleep architecture.”