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2002 Apr;118(4):565-72
Bone and connective tissue healing also benefits from GHK-Cu

Researchers across multiple scientific disciplines explore peptides to better understand cellular processes, biological mechanisms, and other areas of study

[DOI] [PMC free article] [PubMed] [Google Scholar] 112.Sellmann C., Jin C.J., Degen C., De Bandt J.P., Bergheim I

doi: 10.1172/JCI200317929

That is a bit of a catch-22 because B12 is essential for the intestines to be able to function optimally, but they cannot absorb it (from the food) when they are damaged or diseased
