From what I researched, the key difference comes down to absorption
A nongenomic mechanism for metalloestrogenic effects of cadmium in human uterine leiomyoma cells through G protein-coupled estrogen receptor
Once you puncture the vial, however, you've created a potential entry point for contaminants
FAK-Paxillin Pathway and Cell Motility BPC-157 has been shown to activate the focal adhesion kinase (FAK)-paxillin signalling pathway, which governs cell motility, migration, and adhesion to the extracellular matrix
Insulin and Leptin Acutely Modulate the Energy Metabolism of Primary Hypothalamic and Cortical Astrocytes. Journal of Neurochemistry 169: e16211
He is also the founder of 40 Years of Zen, a $2.5 million brain training and cognitive performance facility and host of the largest biohacking conference in the world