The research is promising, but the approval isn't there, and people are making their own choices
In the case of BPC-157, compounders obtain the raw peptide (synthesized via solid-phase chemical synthesis) and then prepare it into injectable vials, nasal sprays, or capsules per a doctors prescription. Clinics and online research chemical websites also sell BPC-157 directly to consumers, often labeling it for research use only to skirt regulations
But this idea of increasing growth hormone receptors at the site of injury or around the site of injury by injecting BPC-157 locally to the injury or even taking it systemically is one thing that many people think of as advantageous and that's why they want to take BPC-157
Then we deconstruct each of those from objective measurements
Since then, it has been the subject of extensive research
Mixing GHK-Cu with BPC-157 in the same syringe, if running a broader protocol, also reduces injection site irritation per reported user experience