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correlational
positive effect

Taking 3 grams of glycine before bed might make people who have trouble sleeping feel like they slept better.

Scientific Claim

Ingestion of 3 grams of glycine before bedtime is associated with improved subjective sleep quality in individuals with chronic unsatisfactory sleep, as measured by self-reported sleep assessments.

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.