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Copper toxicity is a theoretical concern given that GHK-Cu chelates copper ions
XW and JMZ reviewed the literature
Herrera A,Ivanova e,cross M,Bossowski JP,Ding H,Hayashi M,Rajalingam S,Karakousi t,sayin VI,Khanna KM,Wong KK,Wild R,Tsirigos A,Poirier JT,Rudin CM,Davidson SM,Koralov SB,Papagiannakopoulos T
Initially, he said, he sourced his peptides from a compounding pharmacy, but then he switched to a less-expensive gray market company based in the US
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