BPC 157 free base CAS#137525 51 0 cytoprotective agent Modulatory effects of BPC 157 on vasomotor tone and the activation of Src Caveolin 1 endothelial nitric oxide synthase pathway Scientific Reports Most people who talk about side effects from BPC 157 dont realize the problem isnt the peptide itself. The issue is that theyre getting unsterile, contaminated products from low quality research BPC 157 has already hit the mainstream, but should it hit your bloodstream?