Dihexa
Also known as: PNB-0408, N-hexanoic-Tyr-Ile-(6) aminohexanoic acid
Dihexa is a synthetic peptide-derived research compound studied for reported effects on synapse formation and cognition. It is a research compound only and is not approved for human use.
- Category
- Cognitive / Nootropic
- Reported half-life
- Not well established
- Common forms
- Lyophilised powder (research preparations), Research-grade solution
- Research status
- Research compound only, characterised in preclinical studies; not approved for human use in any major jurisdiction, including Australia. Human safety and efficacy data are absent.
- Last updated
- 21 June 2026
Claimed effects
The following effects are reported or claimed by users and in early research. They are not established medical facts and many are not supported by large human trials.
- Reported in animal research to promote synapse formation (synaptogenesis)
- Studied for possible cognitive effects in preclinical models of impairment
- Reported to interact with the hepatocyte growth factor (HGF) / c-Met system
- Early research indicates possible neurotrophic activity
How it is reported to work
Dihexa is a derivative of angiotensin IV and is proposed to act by enhancing hepatocyte growth factor (HGF) signalling through the c-Met receptor, which in animal models is reported to support the formation of new synaptic connections. This proposed mechanism comes from preclinical (animal and laboratory) research and has not been established in humans.
Background
Dihexa is a small synthetic molecule derived from angiotensin IV, developed as a research tool to study synapse formation in the brain. It is an experimental research compound, not a medicine. This page is educational information, not medical advice, and the effects below are reported claims from preclinical work, not established facts.
What the research shows
Most Dihexa data comes from animal and laboratory studies exploring its proposed effect on the HGF/c-Met pathway and synaptogenesis. These results are preliminary and have not been validated in human clinical trials.
| Evidence type | Status |
|---|---|
| Laboratory / animal studies | Present |
| Human clinical trials | Absent |
| Australian approval | None |
What people use it for (reported)
Online, some people discuss interest in Dihexa for memory and cognition. These are anecdotal reports with no clinical validation. Reported benefits should not be read as proven, and nothing here is encouragement to use it.
Things to be aware of
Dihexa is an unapproved experimental compound with essentially no human safety data. Because it is reported to act on growth-factor pathways, long-term risks are unknown, and grey-market preparations cannot be verified for purity or identity. If you have cognitive concerns, the appropriate step is to consult a qualified healthcare professional. This article does not recommend obtaining or using Dihexa.
Reported positives & side effects
Compiled from research and community reports. These are reported outcomes, not guarantees or medical advice, individual experiences vary widely.
Reported positives
- Reported in animal research to promote synapse formation
- Reported interest in supporting memory and learning in preclinical models
- Reported neurotrophic activity via the HGF/c-Met pathway
- Reported by some users as a subjective cognitive lift
Common side effects
- Headache reported by some users
- Irritability or mood changes reported
- Brain fog or fatigue reported
- Sleep disturbance reported
Rare / serious side effects
- Theoretical cancer-growth concern reported due to growth-factor pathway activity
- Unknown human toxicity given the lack of human safety data
- Allergic reactions reported
- Unverified effects from contaminated grey-market product
Reported misuse & overdose risks
What has been reported to happen with overuse, excessive dosing, or long-term misuse of Dihexa. Listed so you can make an informed decision, not to suggest any use is safe.
- Reported human self-experimentation despite the absence of any human safety data
- Reported use ignoring the theoretical growth-factor cancer-promotion concern
- Reported use of unverified grey-market product with no validated dose or purity
- Reported high or prolonged dosing seeking stronger cognitive effects
Reported results timeline
Roughly how long people report it takes to notice effects. A general guide from reports, not a promise, and not advice. Reported subjective cognitive effects are described over days to weeks, though no human efficacy data confirms any onset.
First effects
Reported subjective focus changes within days
Noticeable change
Reported cognitive shifts over one to two weeks
Clear results
Reported cumulative effects, though unverified in humans
Commonly reported dosing & protocol
Reported figures only, NOT a recommendation or dosing advice. These are numbers people report using, compiled for education so you can make an informed decision. We do not advise anyone to take Dihexa. Many peptides are not approved for human use in Australia. Speak to a qualified healthcare professional.
| Route | Oral (also reported as topical research preparations) |
|---|---|
| Typical reported dose | Reported as roughly 8-20 mg per day |
| Frequency | Reported as once daily |
| Cycle length | No human cycle is established; reported anecdotal use spans a few weeks |
No human cycle is established; reported anecdotal use involves low daily dosing over a few weeks. Reported information only, not advice.
Best used with / commonly stacked with
Combinations people report using together. Reported, not recommended, stacking can increase risks.
Reported combined within cognitive-enhancement stacks
Reported paired to balance stimulation with calm in nootropic stacks
Reported discussed together as neurotrophic-focused compounds
Safety notes
Dihexa is an experimental research compound with no approved human use and very little human safety data. Because it is reported to influence growth-factor pathways, potential long-term effects are unknown and grey-market purity cannot be verified. Anyone with a health concern should consult a qualified healthcare professional rather than self-experiment.