As of September 2026, no human trial of Dihexa has been registered or published, and the FDA and the EMA have not approved it. All the evidence comes from rodent studies. The pathway it acts on is also linked to tumor growth, and that concern has not been studied. So nobody knows what it does in people, and you cannot learn from the label what a given vial holds.
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What is Dihexa?
Dihexa is a small modified molecule built from angiotensin IV, a fragment of the hormone angiotensin II. Joseph Harding's lab at Washington State University engineered it in the early 2010s to last longer in the body and to cross into the brain. Rodent results on learning and memory then drew interest from longevity and cognitive-enhancement communities.
Does Dihexa work?
Nobody knows. No human trial results have been published for Dihexa, so there is no human data on whether it does anything.
What we found. 0 completed randomized trials. No human study of any kind, registered or published. 2 published animal studies, in rats and in mice.
| Study | Tested in | Status | What it shows |
|---|---|---|---|
| McCoy and others, 2013, on peptides derived from angiotensin IV | Animals | Published | In rats, Dihexa activated HGF/c-Met, a growth-factor pathway, with effects on cognition and on new connections between brain cells |
| Dihexa in an Alzheimer's mouse model | Animals | Published | The record says it rescued cognitive impairment in the mice |
| Human trials | People | None conducted or registered | No Dihexa human trial has been registered or published as of 2026 |
Rodent studies are all this record holds. They cannot tell you what happens in people.
How we count a trialIs Dihexa safe?
Nobody knows. No human data of any kind have been published for Dihexa, and that includes safety data. The pathway it activates is also implicated in tumor growth, and the record says that concern has not been studied. The rodent studies on the record report on learning and memory, with no safety result. Those are the gaps for the molecule. A vial adds gaps of its own, covered below.
Is Dihexa legal?
- United States
- Not approved by the FDA. No human trials registered.
- Compounding
- The record says a related compound has been discussed for future compounding-committee review. It does not name that compound.
- European Union
- No EMA marketing authorisation, and no clinical trial registered in the EU.
- Sport
- Not named on WADA's list. That is not clearance.
Not medical advice. Approval and sport status as of . Medical disclaimer
What is in a vial sold as Dihexa?
The record calls Dihexa a laboratory research tool. It says rodent results drew interest from longevity and cognitive-enhancement communities, and it does not say how vials reach people. A "research use only" label guarantees nothing about purity. A certificate of analysis counts only if it names your lot number, a lab with no stake in the result, and the method used. Purity and identity are separate tests.
Three questions to ask the seller:
- Which lot number is this certificate for?
- Who ran the test, and are they independent of you?
- Does the report confirm identity by mass spectrometry, or purity alone?
What don't we know?
- Whether it does anything in people. No human trial has been registered or published.
- Whether it feeds tumor growth. Its pathway is implicated in that, and nobody has studied it.
- What the body does with it. No human data on that have been published.
- What is in any given vial.
The other side
A personal result is real to the person who had it. It cannot separate the compound from the vial, or from what the person hoped to feel.
What would change this record?
- A registered Phase 1 trial of safety in people, and of how the body handles the compound. The record calls that the single biggest change.
Three questions to ask next
- What does 'research use only' actually mean?
- How can you tell if a peptide vendor is legitimate?
- How do you read a certificate of analysis?
Ask better questions.
More questions about Dihexa
Has Dihexa been tested in people?
- No. No human trial of Dihexa has been registered or published as of 2026, and the record holds no human data of any kind.
Does Dihexa cause cancer?
- Nobody knows. The pathway it activates is also implicated in tumor growth, and the record says that concern has not been studied.
Is Dihexa approved by the FDA?
- No. The FDA has not approved it, and it has no EMA marketing authorisation.
Are any human trials of Dihexa running now?
- None that this record shows. It lists no registered human trial, and no clinical trial registered in the EU.
Is Dihexa banned in sport?
- It is not named on WADA's list. That is not clearance.
Record checked on . Each source shows the date it was checked.