BPC 157 Nasal Spray Polar Peptides The Human Lab Rats Injecting Themselves with Peptides Office for Science and Society McGill University BPC 157 has already hit the mainstream, but should it hit your bloodstream? People talk about BPC 157 like it's one thing. It isn't. Oral BPC 157 stays local. It survives digestion long enough to act on the GI mucosa, then clears before it reaches systemic circulation.