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bpc 157 derived from gastric juice and Table 1. was discovered and isolated mouse BPC-157 Explained: What We Know
Description
For a broader foundation on how these molecules actually signal, How Peptides Work in the Body and 7 Types of Therapeutic Peptides cover the cell biology in accessible terms
HPLC for aminergic metabolites

PMID 35005595

Safety, tolerability and pharmacokinetics of the oligomer modulator anle138b with exposure levels sufficient for therapeutic efficacy in a murine Parkinson model: A randomised, double-blind, placebo-controlled phase 1a trial

When something isn't working, you fix it together
Despite these findings, the majority of published data remains preclinical and comes from rodent and animal models, rather than human trials
