glutathione nac N-Acetyl-L-Cysteine Vitamin D, Glutathione, and NAC:

Many researchers find that injection timing affects the severity of GI side effects

New concepts of the pathogenesis of cystic fibrosis lung disease

reduced cardiac damage following myocardial stress Collateral pathway activation: BPC-157 demonstrated upgrading of minor vessels to compensate for major vessel occlusion Central Nervous System Research Neuroprotection Studies Research in traumatic brain injury and stroke models demonstrated neuroprotective effects from both peptides[14,15]: BPC-157 : Reduced lesion volumes in cortical injury

For really bad cases, you might need more, and shots are given once a week, or as the doctor says

BPC-157 is packaged in a sealed laboratory vial designed to help maintain product integrity during shipping and storage