BPC-157 vs GHK-Cu

BPC-157

A 15-amino-acid stretch lifted from a protein in human gastric juice. Best-known use is soft-tissue repair, with a quieter second life as a gut-healing protocol.

Best for

Best when the goal is healing an injury or gut lining — tendon, ligament, joint, or GI tissue.

GHK-Cu

The copper-binding tripeptide your skin loses with age. Strongest evidence is topical for skin and wound healing; injectable use is mostly anecdotal.

Best for

Best when the goal is skin quality, hair, and slow cosmetic collagen improvement.

BPC-157

Dozens of rodent and rat studies, mostly from a single Croatian research group (Sikiric and colleagues) that has been investigating this peptide since the 1990s. The replication base outside that group is thin. No completed human RCTs are in the public literature. Use anecdotal-plus-animal as your evidence floor, not as a substitute for the clinical trials that have not been done.

GHK-Cu

Topical cosmetic and wound-healing data is the strongest part of the literature — small but real RCTs from the 1990s and 2000s for skin firmness, wrinkle depth, and diabetic ulcer healing. Loren Pickart's group has been the principal driver of this research for decades. Injectable systemic use has minimal human trial data and the gene-modulation claims that circulate online come from in vitro work, not clinical trials.