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Let's first look at the basic definitions of AHK-Cu and GHK-Cu: GHK-Cu (Glycyl-L-histidyl-L-lysine + Copper): A naturally occurring copper peptide found in human plasma and tissues

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HGH Fragment 176-191 and AOD 9604 are two structurally related compounds that have been examined in research contexts for their interactions with adipose tissue metabolism

Second, they indicate minimal risk of allergic or hypersensitivity reactions, which can occur when immune responses develop against therapeutic peptides

Nature Communications (2025)