What GHK-Cu is sold on vs what the evidence shows
Every row cites its source. Where a cell reflects our own reading of the evidence rather than an external source, the row says so.
Each marketing claim, matched to the best evidence that exists for it and the grade that evidence earns.
| Sold on | Best evidence | Grade | Source |
|---|---|---|---|
| Boosts collagen | Picomolar-to-nanomolar stimulation in fibroblast culture (1988); rat wound chambers (1993); combination ex vivo result (2023) | in-vitro and animal | source |
| Reduces wrinkles and firms skin | No randomized monotherapy serum trial; conference-era industry studies described in originating-researcher reviews; objective endpoints null in the one laser RCT | absence-of-evidence at the product level | source |
| Speeds wound repair | 1994 industry diabetic-ulcer RCT strongly positive; rabbit and mouse studies positive; irradiated rat study null; no approved product ever emerged | human-rct (single, 1994) plus mixed animal | source |
| Regrows hair | AHK-Cu ex vivo follicles, PC1031 in rats, 5-ALA+GHK combination RCT: none is GHK-Cu itself | wrong-compound evidence; absence for GHK-Cu | source |
| Anti-aging and longevity (injections) | C. elegans lifespan (2026), rodent lung and cognition models; zero human trials of injected GHK-Cu | animal only; absence in humans | source |