correlational
Taking 3 grams of glycine before bed might help people reach deep sleep faster
Scientific Claim
Glycine ingestion (3 g) before bedtime is associated with reduced slow wave sleep latency in individuals with chronic unsatisfactory sleep, as measured by polysomnography
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 'shortened' which implies causation, but the design lacks clear randomization and blinding details, so it should be stated as association rather than causation.
Evidence from Studies
No evidence studies found yet.