Taking 3 grams of glycine before bed might help people who have trouble sleeping feel like they slept better, according to their own reports
Scientific Claim
Glycine ingestion (3 g) before bedtime is associated with improved subjective sleep quality in individuals with chronic sleep dissatisfaction, as measured by the St. Mary's Hospital Sleep Questionnaire
Original Statement
“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.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study uses definitive language ('improved') but is an observational cohort study without confirmed randomization or control group, so causation cannot be established. The verb should reflect association rather than improvement.
More Accurate Statement
“Glycine ingestion (3 g) before bedtime is associated with self-reported improvements in sleep quality among individuals with chronic sleep dissatisfaction, as measured by the St. Mary's Hospital Sleep Questionnaire”
Evidence from Studies
No evidence studies found yet.