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The honest answer is that most of the data on BPC-157 comes from preclinical (animal) studies, with limited but growing human evidence

The peptide was originally identified in human plasma and has been widely studied in laboratory environments investigating collagen production pathways, tissue remodeling mechanisms, and extracellular matrix regulation

the animals were allowed to recover from surgery for several days before use in any experiment, and were fasted overnight prior to the the catheter was flushed with saline solution and a volume of saline equal to the volume of blood taken was injected (to maintain total blood volume)

Zhang L, Cai K, Wang Y et al