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Glycine additions aim to improve tolerability
& Culver, B

The presence of O-H/N-H stretching around 3418 cm indicates alcohol, phenol, or amine functionalities
Frontiers in Cellular Neuroscience, 14 , Article 156
doi: 10.2174/18715206113139990078

Gastrointestinal melatonin: localization, function, and clinical relevance