Evidence review

GHK-Cu research

GHK-Cu has human topical evidence and substantial laboratory research, but topical formulations do not validate injectable research products.

Wound study

A randomized diabetic-ulcer study evaluated a specific topical copper-tripeptide gel.

Mixed cosmetic evidence

A small post-laser randomized trial did not show objective between-group improvement, although satisfaction differed.

Route boundary

Topical, cell, animal, and injectable claims are not interchangeable.

What the human studies tested

Located primary human studies used finished topical formulations for wound or post-procedure skin outcomes. They did not test the lyophilized injectable vials found in research-vendor catalogs.

What the laboratory literature adds

Cell and animal studies support effects on extracellular-matrix biology and repair mechanisms. Those findings are mechanistic evidence, not proof of a systemic clinical benefit.