Taking 3 grams of glycine before bed might make people who have trouble sleeping feel like they slept better, based on how they report their sleep.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with improved subjective sleep quality in individuals with chronic sleep dissatisfaction, as measured by self-reported sleep assessments.
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 design (individual cohort study) cannot establish causation, but the abstract uses 'improved' which implies causation. The correct verb strength should be 'associated with' or 'linked to'.
Evidence from Studies
No evidence studies found yet.