is ghk-cu a naturally occurring human peptide

https://cdn.sanity.io/images/h2htgsnz/production/6f4e7aa5ac16f0d17cdcf54583f10f64123066ea-550x550.png?fit=max&auto=format BPC-157 with Arginine 5mg | Research Peptide | Peptides B6 [DOI] [PubMed] [Google Scholar] 100.Chen P, Vaughan J, Donaldson C, Vale W, Li C Strengths:20mg

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