The finding that a GHRH analogue and a growth-hormone-releasing peptide combine to produce a supra-additive GH pulse goes back to work from around 1990 onward, and it is robust 4 but it is a finding about the two classes , demonstrated with various specific peptides, not a study of this exact pair
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Neurochem Res 22:116571, PMID: 9251108 Matsuda T, Shimizu E, Ikehira H, Iyo M, Hashimoto K (2008) Negative correlation between brain glutathione level and negative symptoms in schizophrenia: a 3 T 1H-MRS study