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correlational
positive effect
Taking 3 grams of glycine before bed might help people fall asleep faster and reach deep sleep quicker.
Scientific Claim
Glycine ingestion at 3 grams before bedtime is associated with reduced sleep latency to sleep onset and slow wave sleep in individuals with chronic sleep dissatisfaction, 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.”