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descriptive
neutral effect

Taking 3 grams of glycine before bed doesn't seem to cause any noticeable side effects, according to this study

Scientific Claim

Glycine ingestion (3 g) before bedtime is associated with no significant adverse events in human volunteers

Source Excerpt

Inagawa K, Kawai N, Ono K, Sukegawa E, Tsubuku S, Takahashi M. Assessment of acute adverse events of glycine ingestion at high doses in human volunteers. J. Urban Life Health Assoc. 2006; 50: 27–32.