Peptides for Cognitive Enhancement
Overview
13 research peptides are currently studied for cognitive enhancement. This guide ranks them by evidence strength and covers their mechanisms, safety profiles, and current clinical status.
Cerebrolysin — Phase I–II Clinical Trials
Evidence Rating: C Category: Nootropic / Neuroprotective
Cerebrolysin is a brain-derived peptide complex consisting of low-molecular-weight neuropeptides (25%) and free amino acids (75%), produced by enzymatic hydrolysis of purified porcine brain proteins. All peptide fragments are below 10 kDa, allowing them to cross the blood-brain barrier. It is approv...
Key claims: Improves stroke recovery; Cognitive improvement in dementia.
Noopept — Approved (Russia Only) / Limited Data
Evidence Rating: C Category: Nootropic / Cognitive
Noopept (GVS-111, omberacetam) is a synthetic dipeptide derivative (N-phenylacetyl-L-prolylglycine ethyl ester, MW ~318.4 g/mol) developed at the Russian Academy of Sciences. It is not a true peptide but a peptidomimetic prodrug of the endogenous neuropeptide cycloprolylglycine. Noopept is approved ...
Key claims: Cognitive enhancement in post-stroke and post-TBI patients; Neuroprotective effects.
N-Acetyl Selank Amidate — Early Human / Mixed Evidence
Evidence Rating: C Category: Nootropic / Anxiolytic
N-Acetyl Selank Amidate is a modified version of Selank with N-acetylation and C-amidation for increased metabolic stability. Base Selank is approved in Russia for anxiety and cognitive disorders. This modified form is popular for intranasal use in the research peptide community.
Key claims: Anxiety reduction; Longer duration vs standard Selank.
Selank — Preclinical
Evidence Rating: D Category: Nootropic / Anxiolytic
Selank is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro, MW ~751.89 g/mol) developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. It is a structural analogue of the immunomodulatory peptide tuftsin with an added Pro-Gly-Pro sequence for stability. Approved in Ru...
Key claims: Reduces anxiety without sedation; Enhances cognitive function.
Semax — Preclinical
Evidence Rating: D Category: Nootropic / Neuroprotective
Semax is a synthetic heptapeptide (Met-Glu-His-Phe-Pro-Gly-Pro) derived from adrenocorticotropic hormone (ACTH) fragment 4-10, with an added Pro-Gly-Pro sequence for metabolic stability. Molecular weight is approximately 813.88 g/mol (formula C37H51N9O10S). Discovered in Russia during the 1980s as p...
Key claims: Neuroprotective in stroke; Enhances memory and cognitive function.
Humanin — Preclinical
Evidence Rating: D Category: Metabolic / Mitochondrial
Humanin is a 21-24 amino acid mitochondria-derived peptide (MDP) encoded by the MT-RNR2 gene in mitochondrial DNA. It was originally discovered in 2001 for its ability to protect neurons from Alzheimer's disease-related toxicity. Since then, it has been found to have broad cytoprotective, anti-infla...
Key claims: Neuroprotection against Alzheimer's toxicity; Cardioprotection.
Adamax — Animal/Preclinical Only
Evidence Rating: D Category: Cognitive / Nootropic
Adamax is a synthetic derivative of Semax featuring an adamantane moiety that enhances blood-brain barrier (BBB) penetration and extends its half-life. Like Semax, it is derived from the ACTH(4-10) fragment but with additional N-acetyl and C-terminal adamantyl modifications. It is proposed to increa...
Key claims: More potent than Semax for BDNF elevation; Enhances cognitive function and memory.
Neuroxelin — Animal/Preclinical Only
Evidence Rating: D Category: Cognitive / Neuroprotection
Neuroxelin is a synthetic neuroprotective peptide proposed to modulate NMDA receptor activity and downregulate excessive microglial activation. It is theorized to protect neurons from excitotoxic damage while promoting synaptic plasticity. No peer-reviewed clinical trials or substantial preclinical ...
Key claims: Neuroprotective against excitotoxicity; Reduces neuroinflammation.
FGL(S) — Preclinical Only
Evidence Rating: D Category: Neuroprotection / Research
FGL(S) is a synthetic peptide derived from the neural cell adhesion molecule (NCAM) that directly activates the fibroblast growth factor receptor (FGFR). It promotes neurite outgrowth, neuronal survival, and synaptic plasticity in preclinical models.
Key claims: Cognitive enhancement; Neuroprotection.
P21 — Preclinical
Evidence Rating: D Category: Nootropic / Neurogenesis
P21 is a synthetic peptide derived from the active region of Ciliary Neurotrophic Factor (CNTF) that promotes hippocampal neurogenesis without the immunogenic side effects of full-length CNTF. It was developed to cross the blood-brain barrier and stimulate brain-derived neurotrophic factor (BDNF) re...
Key claims: Promotes hippocampal neurogenesis; Improves spatial learning and memory.
9-Me-BC — Preclinical
Evidence Rating: D Category: Nootropic / Dopaminergic
9-Me-BC (9-Methyl-β-carboline) is a heterocyclic amine from the β-carboline family that has shown dopaminergic neurotrophic properties in preclinical studies. It is not a peptide but appears in peptide vendor catalogs and nootropic databases. In vitro and rodent studies suggest it promotes dopaminer...
Key claims: Promotes dopaminergic neuron growth; Improves cognitive function.
Dihexa — No Regulatory Activity
Evidence Rating: F Category: Nootropic / Cognitive
Dihexa (PNB-0408) is a synthetic small molecule derived from angiotensin IV, developed at Washington State University by the Harding lab. It is a hepatocyte growth factor (HGF) mimetic that activates HGF/c-Met signaling in the brain, promoting synaptogenesis, neuroplasticity, and neuronal survival. ...
Key claims: Rescues cognitive impairment in Alzheimer's model; Promotes peripheral nerve regeneration.
Related Research News
Boost Focus and Clarity with Selank and Semax Duo
Selank and Semax, synthetic peptides from Russian research labs, offer complementary cognitive benefits. Selank reduces anxiety and sharpens attention by balancing neurotransmitters and upregulating BDNF. Semax sustains focus through neuroprotection and neurotrophin enhancement, with studies showing improved memory under stress when used together.
Semax: Guide to the ACTH-Derived Nootropic Peptide
Semax is a synthetic heptapeptide from the ACTH(4-7) sequence, developed in Russia during the 1980s for neuroprotective and cognitive effects. Research shows it upregulates BDNF and TrkB, improves outcomes in ischemia models, and enhances learning in rodents. This guide covers its structure, mechanisms, and research applications while noting variants like N-Acetyl Semax.