bpc 157 side effects Regeneration or Risk? A Narrative Review of BPC-157 for Musculoskeletal Healing The Hidden Risks of BPC‑157:

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"BPC 157 and wound healing: New perspectives in soft tissue injury management." Injury , 51(1), S45S54

For example: If you add 1mL, the concentration is 10,000mcg/mL

PubMed Gollwitzer H, et al

In rodent models, BPC-157 demonstrated a wide therapeutic index with no observed hepatotoxicity, nephrotoxicity, or neurotoxicity across multiple dosing regimens. Sikiric et al., Regenerative Pharmacology Reported Side Effects (Rare) While side effects are rare, some users report: Peptides like BPC-157 generally exhibit low immunogenicity and low systemic toxicity, though user-specific variables such as injection technique or gut sensitivity may influence short-term side effects. [Clinical Peptide Society Review, 2021] Is BPC-157 Safe for Long-Term Use

It's now impossible to say whether that was true, or a placebo effect