What alternative peptide can be used for tissuerepair or antiinflammatory therapy in a patient with estrogenreceptorpositive breast cancer who should avoid thymosin beta4 (TB500)? AP's BPC 157 peptide warning skips every doctor who disagrees Seattle Red Peptide Therapy Peptides like BPC 157 are everywhere on social media right now. They are most commonly promoted for injury and tendon healing and are often paired with other peptides such as TB 500. Beyond BPC 157 & TB 500 What Really Heals Injuries Fast