correlational
Taking 3 grams of glycine before bed might help people who have trouble sleeping feel less sleepy during the day, according to their own reports.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with reduced daytime sleepiness in individuals with chronic sleep dissatisfaction, as measured by the Stanford Sleepiness Scale.
Original Statement
“Glycine lessened daytime sleepiness and improved performance of memory recognition tasks.”
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 'lessened' which implies causation, but the study design (individual cohort study with unclear randomization and blinding) only supports associative language.
Evidence from Studies
No evidence studies found yet.