GHK-Cu vs AHK-Cu: What Changes in the Copper Peptide?

GHK-Cu and AHK-Cu are different copper-peptide complexes. GHK begins with glycine; AHK begins with alanine. Both continue with histidine and lysine, but changing that first amino acid changes the peptide's identity. For a buyer, the immediate consequence is that a paper about AHK-Cu should not be presented as a study of a GHK-Cu product.

Read the three letters

The letters describe the peptide chain; Cu denotes copper. These are not two spellings of the same ingredient, and the first letter is not a strength grade.

GHK-Cu's identity and collagen-related cellular activity appear in the original fibroblast study. AHK-Cu's alanine-based sequence is explicitly identified in the 2007 hair-follicle paper.

Why the hair paper belongs to AHK-Cu

That 2007 study examined isolated human hair follicles outside the body and cultured dermal papilla cells. AHK-Cu stimulated follicle elongation and cell proliferation in those experimental systems. This is a useful clue to why AHK-Cu appears in hair-related discussions.

It is a laboratory finding involving human tissue, not a trial in which people used a finished scalp product and had their hair regrowth measured. It also does not turn into GHK-Cu evidence because both complexes contain copper.

GHK-Cu has its own topical research. A small post-laser study reported greater participant satisfaction but no additional improvement in objective wrinkle or overall skin-quality assessments. That distinction keeps cellular effects and visible skin outcomes separate.

Match the ingredient to the offer

Bodypharm's current listing is GHK-Cu, with 50 mg declared per pen. An AHK-Cu serum mentioned in a search result is therefore a different ingredient and a different format.

When comparing products, keep the exact three-letter sequence attached to the result you are interested in: collagen synthesis in cells, hair-follicle elongation outside the body or visible changes from a topical formula. This gives you a more useful comparison than treating “copper peptide” as one interchangeable product category. None of those topical or laboratory examples establishes the outcome of an injectable GHK-Cu pen.