A practical way to think about concentration: For face and neck use, a 4% GHK-Cu concentration is often gentle enough for regular routines
It's not just about sleepit's about helping your whole system calm down
The CAS number for BPC-157 is 137525-51-0, which uniquely identifies the compound for research and regulatory reference

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Zipser BD, Johanson CE, Gonzalez L, Berzin TM, Tavares R, Hulette CM, et al
A small number of human studies from the 1980s and 1990s reported improvements in sleep architecture and reduced insomnia symptoms, but these trials had very small sample sizes (often under 20 subjects), lacked rigorous controls, and have not been replicated with modern methodology