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doi: 10.3389/fimmu.2023.1169232 9 ZhaiYPangY

Why This Research Matters Most copper peptide research has focused on GHK-Cu (glycyl-L-histidyl-L-lysine copper) in laboratory settings studying its effects on isolated hair follicles or reviewing its gene expression profile

It is chemically a true peptide (six amino acids, including two D-amino acid substitutions for stability), so unlike some non-peptide GH secretagogues it is correctly classified in this category

For broader literature on potential harms in related contexts see this review at PMC

We showed that the haem-mediated dimer of PGRMC1 enables interaction with different subclasses of cytochromes P450 (CYP) (Fig