is ghk-cu naturally occurring in humans

https://lookaside.fbsbx.com/lookaside/crawler/media/?media_id=1109072761687308 lyophilized peptide Purity determined by RP-HPLC, identity confirmed by LC-MS, net content verified gravimetrically Size:12-Month Supply Buy BPC-157 UK | 99%+ HPLC, Batch COA | Nexyra Lab

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