The Short Version
No peer-reviewed evidence supports the assertion that GHK-Cu delivers copper specifically to mitochondria or directly enhances ATP production. The strongest biomedical sources show only that GHK-Cu modulates broad cellular copper uptake and gene expression, while mitochondrial copper import relies on dedicated chaperones (COX17, SLC25A3) with no demonstrated role for GHK-Cu. The explicit mitochondria/ATP claims trace back to marketing materials, YouTube videos, and wellness blogs — not controlled experiments or peer-reviewed research.