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Effect of precipitated withdrawal on extracellular glutamate and aspartate in the nucleus accumbens of chronically morphine-treated rats: an in vivo microdialysis study

(2003) published comprehensive reviews documenting BPC-157's effects in various GI models, observing that the peptide demonstrated notable activity in multiple experimental paradigms

The data to definitively know which peptides work or not already exists;This guy on Reddit just dropped a 57-page Google Doc summarizing peptides like BPC-157, and all the human trials that have been done so far Link below

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Preclinical evidence is encouraging but preliminary