GHK Basic

GHK Basic refers to copper-free glycyl-L-histidyl-L-lysine rather than the better-known copper complex GHK-Cu. This distinction matters because much of the broad tissue-repair literature involves GHK complexed with copper. Direct copper-free GHK evidence exists but is narrower. A peer-reviewed skin study reported that copper-free GHK increased proliferation of cultured normal human keratinocytes and affected basal-cell morphology and stemness-associated markers in skin-equivalent models. Reviews of GHK and GHK-Cu place the tripeptide in broader skin-repair and extracellular matrix biology, but those findings should be treated as related background rather than direct evidence for copper-free GHK Basic.

Copper-Free GHK Skin Models

Copper-free GHK increased proliferation of cultured normal human keratinocytes and affected basal-cell features and stemness-associated markers in skin-equivalent models ^[1].

Related GHK/GHK-Cu Context

Broader GHK literature describes the tripeptide as an endogenous copper-binding peptide involved in matrix remodeling and skin-repair biology, but many findings involve GHK-Cu ^[2][3].

Evidence Boundary

Claims should prioritize direct copper-free GHK findings and avoid treating GHK-Cu data as interchangeable ^[1][2][3].

Laboratory Evidence Limits

Direct copper-free GHK evidence is mainly laboratory skin-model evidence and does not establish human clinical safety or efficacy ^[1].

Copper Complexation Caveat

GHK-Cu findings should not be automatically transferred to GHK Basic because copper complexation can change biological behavior ^[2][3].