Dihexa
WellnessAlso known as: N-hexanoic-Tyr-Ile-(6) aminohexanoic amide, PNB-0408
Limited EvidenceWhat is Dihexa?
A synthetic peptide derivative designed to enhance hepatocyte growth factor (HGF) signaling. Developed at Washington State University as a potential cognitive enhancer. Extremely popular in nootropic communities despite being untested in humans.
How it works
Binds to and stabilizes hepatocyte growth factor (HGF), preventing its degradation and enhancing HGF/c-Met receptor signaling. This pathway promotes synaptogenesis (new synaptic connections) and neurotrophic effects in the brain.
What marketers claim
- ▸millions of times more potent than BDNF
- ▸reverses cognitive decline
- ▸treats Alzheimer's disease
- ▸dramatically boosts memory and learning
What evidence supports
- ✓enhanced cognitive performance in aged rats at picomolar concentrations in animal studies
- ✓promoted synaptogenesis in cell culture models
- ✓showed neuroprotective effects in scopolamine-treated rat models of cognitive impairment
Research evidence
Key studies on Dihexa, summarized in plain language. This is not an exhaustive list — it highlights the most relevant findings.
Dihexa improves cognitive function in aged rats via HGF/c-Met signaling
Finding: Dihexa administered intranasally or orally to aged rats improved performance in water maze and novel object recognition tasks, suggesting enhanced memory consolidation and spatial learning.
Limitation: Rat cognitive models have limited translatability to human cognition. No human trials have been conducted. Long-term safety was not assessed.
Best for
Safety notes & concerns
Full safety guide →- ⚠zero published human clinical trials
- ⚠the "millions of times more potent" claim compares potency (effective dose), not efficacy — a lower dose needed does not mean stronger effects
- ⚠HGF/c-Met pathway is implicated in cancer cell growth and metastasis — long-term safety is a significant unknown
- ⚠only available from unregulated research chemical suppliers
- ⚠patent held by Washington State University but never advanced to clinical development
- ⚠extremely limited long-term safety data even in animal models
Pairs well with
Use caution with
Frequently asked questions
Is Dihexa really millions of times more potent than BDNF?
This claim is misleading. The original research found Dihexa was active at picomolar concentrations (very small amounts), while BDNF requires nanomolar concentrations — about a million-fold difference in dose. But potency (how little you need) is not the same as efficacy (how well it works). A lower effective dose does not mean Dihexa produces stronger cognitive effects than BDNF.
Why hasn't Dihexa gone to human trials?
Despite being patented in 2012, Dihexa has never entered clinical development. The reasons are unclear but may include concerns about the HGF/c-Met pathway's role in cancer promotion, difficulty securing funding, or insufficient preclinical data to justify the safety risk. This is a significant red flag for a compound marketed as a cognitive enhancer.
Is Dihexa safe?
Unknown. There are no human safety studies. The primary concern is that HGF/c-Met signaling promotes cell proliferation and is overactive in many cancers. Whether exogenous HGF enhancement would increase cancer risk in humans is completely untested. This risk alone should give serious pause.
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Last updated: 2025-03-25
Medical Disclaimer
The information on this site is for educational and informational purposes only. It is not intended as medical advice and should not be used to diagnose, treat, or prevent any condition. Always consult with a qualified healthcare professional before starting any new supplement, peptide, or treatment protocol.