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correlational
positive effect

Taking 3 grams of glycine before bed might help people who have trouble sleeping sleep better, and it might work differently than common sleep medications like benzodiazepines.

Scientific Claim

Ingestion of 3 grams of glycine before bedtime is associated with improved sleep quality in individuals with chronic sleep dissatisfaction, with effects that may be mediated through different mechanisms than traditional hypnotic drugs.

Source Excerpt

Thus, a bolus ingestion of glycine before bedtime seems to produce subjective and objective improvement of the sleep quality in a different way than traditional hypnotic drugs such as benzodiazepines.