Peptides Lack Reliable Safety Information, Watchdog Warns BPC 157 & The Gut Brain Axis: A Practitioner's Definitive Review of the Evidence Peptides like BPC 157, TB 500, and growth hormone secretagogues are increasingly marketed for recovery and injury healing., But what does the science actually say?, Most evidence comes from animal 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.