Dihexa

Primary Benefits

• Supports neuroplasticity and synaptic signaling pathways
• Helps support learning, memory, and cognitive resilience in preclinical models
• Activates research interest in HGF/c-Met pathways involved in synapse formation
• Supports neuronal repair and brain-aging research
• Commonly used for cognitive support and neuroregeneration research

Mechanism of Action

Dihexa (PNB-0408) is a modified angiotensin IV-derived peptide-like compound designed for neuroplasticity research. It has been studied for its ability to influence hepatocyte growth factor (HGF)/c-Met-related signaling, a pathway involved in neuronal survival, dendritic branching, synapse formation, and repair responses. Early Dihexa research focused on blood-brain barrier penetration, synaptogenesis, and reversal of memory impairment in rodent models. Core animal studies included oral gavage, with 2.0 mg/kg/day producing the strongest oral effect in a scopolamine-impaired rat model. However, Dihexa has no established human clinical dosing, and parts of its foundational research literature have been formally questioned or retracted, so all claims should be interpreted cautiously.

Dosing & Protocol

Oral (preferred)

Preparation:

-No BAC water required. Use oral Dihexa as supplied.

Daily Dose:

-10 mg once daily

Cycle:

-5 days on / 2 days off; 2–4 weeks or as directed by your healthcare provider

Timing:

-Morning most common

Potential Side Effects

• Headache, nausea, digestive upset, or changes in appetite
• Restlessness, stimulation, or sleep disruption
• Anxiety, irritability, or changes in mood
• Vivid dreams, changes in focus, or cognitive intensity that feels uncomfortable
• Rare: allergic reaction, severe mood changes, or concerning neurological symptoms; discontinue and seek medical guidance

If side effects occur, users commonly reduce dose or discontinue use and consult a healthcare professional.

Common Stacks

• With Pinealon: For brain bioregulator and neuroprotection-focused protocols
• With Semax: For focus, learning, and cognitive-performance research
• With Selank: For balancing cognitive stimulation with stress resilience
• With Cerebrolysin: For advanced neurorecovery protocols under clinician guidance

Notes

• Dihexa is taken orally.
• Dihexa has no established human clinical dosing, pharmacokinetic profile, or long-term safety data.
• Because HGF/c-Met is a growth-factor pathway involved in tissue repair and cancer biology, avoid use in active or recent cancer unless supervised by a qualified clinician.
• Dry Dihexa should be stored in the freezer after arrival unless the product label or protocol says otherwise, tightly sealed and protected from moisture and light.
• Introduce Dihexa by itself before stacking, since response can be stimulating and the evidence base is less settled than many standard peptides.

References

Evaluation of metabolically stabilized angiotensin IV analogs as procognitive/antidementia agents (McCoy et al., 2013, J Pharmacol Exp Ther)

Link: https://pmc.ncbi.nlm.nih.gov/articles/PMC3533412/

The brain HGF/c-Met receptor system: a new target for Alzheimer’s disease research (Wright & Harding, 2015, J Alzheimers Dis)

Link: https://pubmed.ncbi.nlm.nih.gov/25649658/

Reduced HGF/MET signaling may contribute to synaptic pathology in an Alzheimer’s disease mouse model (2022, Front Aging Neurosci)

Link: https://pubmed.ncbi.nlm.nih.gov/35903536/

Procognitive and synaptogenic effects of AngIV-derived peptides and HGF/c-Met signaling (Benoist et al., 2014; PubMed page includes 2025 retraction notice)

Link: https://pubmed.ncbi.nlm.nih.gov/25187433/

Disclaimer

The information provided in this article is for educational and informational purposes only and is not intended as medical advice. These statements have not been evaluated by the FDA or Health Canada. Peptides and other compounds discussed are intended for research purposes only and are not approved for human consumption unless prescribed by a licensed medical professional. Always consult your healthcare provider before starting any new protocol, supplement, or treatment.