In a clinical setting, BPC-157 is used for a narrower and more defined set of problems than the internet suggests
However, try out 4-6 mm / 30-31G needles first

Oral BPC-157 Gut and Systemic Support: Repairs and strengthens the gut lining (helps with leaky gut, ulcers, and reflux) Reduces inflammation in the gastrointestinal tract Supports digestion, nutrient absorption, and gutbrain balance Promotes overall systemic recovery and immune support BPC-157 Injection Musculoskeletal Repair: Accelerates healing of tendons, ligaments, muscles, and joints Reduces inflammation and pain from overuse or injury Improves mobility, flexibility, and physical recovery Supports post-surgical and chronic injury rehabilitation BPC-157/TB 500 Accelerates healing of muscles, tendons, ligaments, and joints Promotes angiogenesis (new blood vessel formation) to improve circulation and oxygen delivery Reduces inflammation and swelling Improves flexibility, strength, and mobility Enhances post-surgical and injury recovery Supports collagen synthesis and connective tissue repair Reduces scar tissue and promotes smoother recovery Aids systemic recovery from chronic overuse and strain What are the side effects of BPC-157

For best results, injections are given intramuscularly in areas such as: Patients may receive injections in-office or learn safe self-administration at home