There is no published human safety data. Dihexa is genuinely experimental - it has only been studied in animals. The HGF/c-Met pathway it activates is also involved in certain cancers, which is a theoretical concern. Use is highly speculative.

Can dihexa help with Alzheimer's?

It was originally developed for this purpose and shows strong promise in animal models. However, no human trials have been conducted, and many promising Alzheimer's drug candidates have failed in human trials despite strong animal data.

Cognitive Enhancement

Dihexa

N-Hexanoic-Tyr-Ile-(6) Aminohexanoic Amide

Seven orders of magnitude more potent than BDNF

Dihexa is a small peptide analog of angiotensin IV that crosses the blood-brain barrier and dramatically enhances cognitive function in animal models.

Admin routes

Oral, Subcutaneous, Intranasal

Popularity

Niche

Side effects

Monitor closely

Vendors

0 rated

Key benefits

110 million times more potent than BDNF at synaptic connectivity

2Orally active - crosses blood-brain barrier

3Enhances memory and learning in animal models

4Promotes new synaptic connections

5Potential for neurodegenerative disease

6Small molecule - stable and practical

What to expect

Day 1–3

Subtle cognitive enhancement; improved focus

Week 1–2

Enhanced memory formation and recall

Week 2–4

Improved learning speed and cognitive processing

Week 4–8

Sustained nootropic effects; synaptic connectivity enhancement

Based on community reports and published research. Individual results vary significantly.

Dosing protocols

Cognitive enhancement

Dose

10–20 mg

Frequency

Once daily (oral)

Duration

4–8 weeks

Sublingual/intranasal

Dose

5–10 mg

Frequency

Once daily

Duration

4–6 weeks

Dosing information is sourced from published research and community protocols. This is not a recommendation. Consult a healthcare professional.

Research status|Preclinical - limited to animal studies

Overview

Dihexa is a modified hexapeptide derived from angiotensin IV research at Washington State University. It is orally active, crosses the blood-brain barrier, and has been shown to be approximately 10 million times more potent than BDNF (brain-derived neurotrophic factor) at promoting synaptic connectivity in animal models. It was originally investigated for Alzheimer's disease and cognitive decline.

How it works

Binds to hepatocyte growth factor (HGF) receptor (c-Met), enhancing HGF/c-Met signalling in the brain. This promotes dendritic spine formation, synaptogenesis, and neural connectivity. Unlike BDNF, which cannot cross the blood-brain barrier when administered systemically, dihexa achieves brain penetration orally. The result is enhanced learning, memory formation, and cognitive processing in animal studies.

Side effects

No published human safety data - experimental

moderateRare

Headache reported anecdotally

mildUncommon

Theoretical concern: HGF/c-Met pathway is involved in some cancers

seriousRare

Research history

2011

Developed at Washington State University by Drs. Harding and Wright

2013

Published as '10 million times more potent than BDNF' in JPET

2014

Further procognitive effects confirmed in rodent models

2020s

Adopted in nootropic community despite limited human data

The BDNF comparison

The '10 million times more potent than BDNF' figure refers specifically to dihexa's ability to promote synaptic connectivity and dendritic spinogenesis in vitro - not overall cognitive effect. BDNF and dihexa work through completely different mechanisms (BDNF via TrkB receptors, dihexa via HGF/c-Met). The comparison illustrates dihexa's extreme potency at its specific target, but should not be interpreted as 'dihexa is 10 million times better for your brain.'

Recommended products

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Core Supplies

Bacteriostatic Water 30mL

Sterile bacteriostatic water for peptide reconstitution. Contains 0.9% benzyl alcohol to inhibit bacterial growth.

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Storage & Transport

Portable Insulin Cooler Fridge

Portable peptide fridge with precise 2-8C cooling. Battery powered, travel-ready. Designed for insulin/peptide storage.

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References

[1]McCoy AT, et al. 'Evaluation of metabolically stabilized angiotensin IV analogs as procognitive/antidementia agents.' Journal of Pharmacology and Experimental Therapeutics, 2013.
[2]Benoist CC, et al. 'Dihexa acts as a procognitive agent in rodents.' Journal of Pharmacology and Experimental Therapeutics, 2014.

Frequently asked questions

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Community experiences

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Disclaimer: This guide is for educational and informational purposes only. It is not medical advice. The dosing protocols listed are sourced from published research and community reports and do not constitute a recommendation. Always consult a qualified healthcare professional before using any peptide. Check your local regulations regarding peptide purchase and use.