Peptide Reference Desk
Dihexa evidence review: HGF/c-Met pharmacology, retractions, and what remains supportable
A critical review of Dihexa that separates molecular identity, preclinical HGF/c-Met findings, retracted papers and unsupported clinical claims.
Begin with the evidence problem, not the promise
Dihexa is an angiotensin-IV-derived oligopeptide analogue discussed for its interaction with hepatocyte growth factor (HGF) and c-Met signaling. Nearly all claims with practical significance trace back to preclinical work. There is no published human efficacy program that justifies describing Dihexa as a clinically established cognitive treatment.
This distinction became more important after retractions affected papers central to the compound’s popular narrative. A responsible review must identify which result came from which paper, whether that paper remains in the literature, and whether an independent group reproduced it.
How to audit the citation chain
- Open the publisher page and check the current article status; do not rely on a cached PDF.
- Record the exact Dihexa construct, model, concentration and endpoint.
- Separate direct c-Met measurements from downstream behavioral inference.
- Look for replication outside the originating laboratory.
- Do not count a review that cites the same experiment as independent evidence.
| Claim type | Minimum support |
|---|---|
| Molecular identity | Structure, expected mass and orthogonal analytical confirmation |
| HGF/c-Met activity | Defined biochemical or cellular assay with controls |
| Synaptogenic effect | Prespecified model, blinded analysis and replication |
| Human benefit | Controlled clinical evidence—not animal extrapolation |
What remains scientifically reasonable
Dihexa remains a research compound relevant to questions about HGF/c-Met modulation and neurobiology. That is narrower than the claims commonly attached to it. The pathway also has roles in proliferation and oncobiology, so simplistic “brain growth” language is scientifically careless.
Material qualification
A research lot should be tied to a defined chemical structure, salt form, LC-HRMS identity, chromatographic purity, water and content. A high area-percent result does not resolve stereochemistry, net content or biological activity.
Verify with primary records
Use the primary paper, current regulator label or lot-linked analytical file for the claim it supports. A search result is a route to evidence, not the evidence itself.