Dihexa vs Noopept
A detailed comparison to help you understand the differences and choose the right peptide for your research goals.
Dihexa
Dihexa is a nootropic peptide derived from angiotensin IV. It has shown remarkable cognitive-enhancing properties in animal studies, being described as potentially millions of times more potent than BDNF.
Full details →Noopept
Noopept (N-phenylacetyl-L-prolylglycine ethyl ester) is a peptide-derived nootropic developed in Russia. While technically a dipeptide prodrug rather than a true peptide, it's often discussed alongside peptide nootropics.
Full details →Side-by-Side Comparison
| Aspect | Dihexa | Noopept |
|---|---|---|
| Dose Range | 5 mg–20 mg | 10 mg–30 mg |
| Frequency | 1x daily | 2x daily |
| Cycle Length | 4–12 weeks | 4–6 weeks |
| Route | oral | oral |
| Mechanism | Acts as a hepatocyte growth factor (HGF) potentiator by binding to its receptor c-Met. Promotes synaptogenesis, neuronal survival, and cognitive enhancement through this pathway. | Metabolized to cycloprolylglycine which modulates AMPA and NMDA receptors, increases NGF and BDNF expression, and provides neuroprotective effects through antioxidant mechanisms. |
| Typical Dosage | Research dosing is highly variable due to extreme potency. Typical range: 10-40mg orally or sublingually. Start with lowest doses due to potency. | Oral: 10-30mg daily, typically divided into 2-3 doses. Sublingual use may enhance absorption. Some users go higher but effects may plateau. |
| Administration | Can be taken orally, sublingually, or intranasally. Extremely potent - careful dosing is essential. Best used cyclically. | Oral or sublingual administration. Unlike most peptides, it's orally bioavailable. Can be taken with or without food. |
| Side Effects | Limited human data. Reported effects include headache, temporary brain fog during adjustment, and potential mood changes. | Headache (often from choline depletion), irritability, insomnia if taken late, and occasional brain fog during initial use. |
| Best For |
What They Have in Common
Dihexa, Noopept are both commonly used for:
Which Has Stronger Evidence?
| Goal | Dihexa | Noopept |
|---|---|---|
| Cognitive Performance | medium | medium |
Key Studies
Dihexa
- AngIV-Analog Dihexa Rescues Cognitive Impairment and Recovers Memory in the APP/PS1 Mouse via the PI3K/AKT Signaling Pathway.
Brain sciences, 2021
- Stem cell, Granulocyte-Colony Stimulating Factor and/or Dihexa to promote limb function recovery in a rat sciatic nerve damage-repair model: Experimental animal studies.
Annals of medicine and surgery (2012), 2021
Noopept
- Effects of noopept on ocular, pancreatic and renal histopathology in streptozotocin induced prepubertal diabetic rats.
Biotechnic & histochemistry : official publication of the Biological Stain Commission, 2023
- Intranasal Administration of Forskolin and Noopept Reverses Parkinsonian Pathology in PINK1 Knockout Rats.
International journal of molecular sciences, 2022
- Noopept; a nootropic dipeptide, modulates persistent inflammation by effecting spinal microglia dependent Brain Derived Neurotropic Factor (BDNF) and pro-BDNF expression throughout apoptotic process.
Heliyon, 2021
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