Cerebrolysin vs Dihexa

Standardized mixture of neuropeptides derived from porcine brain proteins; mimics endogenous neurotrophic factors (BDNF, NGF, CNTF); promotes neurogenesis and synaptic plasticity

Cerebrolysin is a brain-derived polypeptide preparation derived from porcine cortical tissue, composed of low-molecular-weight neuropeptides and free amino acids that cross the blood-brain barrier and exert neurotrophic and neuroprotective effects. It is proposed to mimic endogenous neurotrophic factors, supporting neuronal survival, synaptic plasticity, and metabolic activity in damaged or degenerating brain tissue through multiple growth factor-like pathways. A Cochrane systematic review and multiple controlled clinical trials from Eastern European research groups have evaluated cerebrolysin for vascular dementia and stroke-related cognitive impairment, with mixed results that suggest potential benefit in specific post-stroke populations. Cerebrolysin is not FDA-approved; it is approved and widely used in Russia, Eastern Europe, and some Asian countries as a prescription neuroprotective treatment, and its evidence base reflects predominantly Eastern European clinical methodology with variable trial quality. Cerebrolysin price and access: Cerebrolysin is not available through standard US pharmacy channels; it is a prescription medication in the countries where it is approved (Russia, Eastern Europe, China, South Korea, and others) and is not FDA-approved. In markets where it is approved, cerebrolysin is administered intravenously in clinical settings — IV infusion courses of 10–20 sessions are the standard research and clinical protocol, with treatment costs varying significantly by country and clinic. Importation for personal use exists in a legal grey area in the United States; some wellness and peptide clinics may offer cerebrolysin as part of supervised protocols. Cancer-adjacent research: cerebrolysin's neurotrophic properties have drawn preclinical research interest in the context of chemotherapy-induced cognitive impairment (chemobrain), where neuroprotection during and after oncology treatment is a research priority. Autism spectrum disorder research: small controlled trials from Eastern European groups have evaluated cerebrolysin for speech and behavioral development in children with ASD, with mixed results; this remains an exploratory research area with no established clinical consensus. Stroke rehabilitation remains cerebrolysin's strongest evidence base, with multiple controlled trials evaluating cognitive and functional recovery in post-stroke patients.

HGF/MET receptor potentiator; promotes new synapse formation; estimated 7 orders of magnitude more potent than BDNF in synaptogenesis models

Dihexa is a synthetic small peptide drug candidate developed at Washington State University, proposed to augment cognitive function through potentiation of hepatocyte growth factor (HGF) and MET receptor signaling, a pathway that supports synaptic formation and hippocampal neuroplasticity. The underlying AT4/IRAP receptor system, through which dihexa is proposed to act, has been shown in preclinical rodent studies to enhance long-term potentiation (LTP) in hippocampal tissue and support neuroplastic processes associated with memory formation. Preclinical models have demonstrated memory-enhancing effects following dihexa administration; however, no peer-reviewed human clinical trials have been published as of 2025 and the compound does not appear in indexed biomedical literature under its common name. Dihexa is a research compound with no regulatory approval of any kind; it is not an approved pharmaceutical, and no human safety or pharmacokinetic data has been established. Dihexa administration in research contexts: the compound has been studied in rodent models via oral, intranasal, and subcutaneous routes, with preclinical data suggesting intranasal delivery may offer efficient CNS access due to olfactory pathway absorption. Nasal spray formulations are available through some research compound suppliers on this basis, though the clinical translatability of rodent CNS delivery data to humans has not been established. Dihexa is structurally derived from angiotensin IV and shares the AT4/IRAP receptor pharmacology of its precursor compounds; it is sometimes compared to semax and other nootropic peptides in terms of proposed cognitive mechanism, though its HGF/MET-dependent mechanism is distinct from the ACTH-fragment or NGF-upregulating mechanisms of semax and selank. The cognitive enhancement peptide landscape — and provider availability for researched compounds in this space — is covered in the PeptideBase cognitive peptides directory.