is ghk-cu naturally occurring in humans

My GP still refusing to give me injections : r/B12_Deficiency Other clinical studies have shown no improvement (Damgaard and Treebak 2023 Quantity:Single Vial $80 peptide serum duo https://polarispeptides.com/acd-cgi/img/v1/wp-content/uploads/2024/02/bpc-157-5-mg-transparent-background-1024x1024.png

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