How Long Does BPC 157 Take to Work? Timeline and Guide BPC 157 Injection Dosage and Benefits for Chronic Pain Relief There's a common misconception about peptide injections that targeting them directly at pain sites is more effective than abdominal injection. However, when you inject peptides like BPC 157 BPC 157 For Knee Pain: Early Reported Outcomes, A report on intra articular BPC 157 for knee pain described high rates of improvement: ~92% with BPC 157 alone, ~75% when combined with thymosin beta 4,