Semax

A Russian-developed peptide nasal spray, approved there for stroke recovery and cognitive complaints, essentially unknown to Western regulators. One of the two Russian peptides (with Selank) that anchor the nootropic corner of this space.

Russian clinical literature reports cognitive and neuroprotective effects, but it is largely untranslated, small-n, and from a research culture Western reviewers cannot easily audit. Mechanism (BDNF upregulation) is plausible and partly replicated in animals. Independent Western RCTs: effectively none. You are trusting a literature you cannot read.

Short-term tolerability looks benign in the reports that exist (nasal irritation). The honest risk is the unknown: no long-term human safety data outside Russia, and grey-market vials of a peptide with no Western pharmacopeia standard are a purity lottery.

US: not approved, not scheduled — sold as "research" material. Prescription drug in Russia.

• Functional Connectomic Approach to Studying Selank and Semax EffectsDokl Biol Sci · 2020
• Semax peptide targets the μ opioid receptor gene Oprm1 to promote deubiquitination and functional recovery after spinal cord injury in female miceBr J Pharmacol · 2025
• Therapeutic Peptides in Orthopaedics: Applications, Challenges, and Future DirectionsJ Am Acad Orthop Surg Glob Res Rev · 2026
• Semax, synthetic ACTH(4-10) analogue, attenuates behavioural and neurochemical alterations following early-life fluvoxamine exposure in white ratsNeuropeptides · 2021
• Semax, a Synthetic Regulatory Peptide, Affects Copper-Induced Abeta Aggregation and Amyloid Formation in Artificial Membrane ModelsACS Chem Neurosci · 2022
• Semax, a Copper Chelator Peptide, Decreases the Cu(II)-Catalyzed ROS Production and Cytotoxicity of aβ by Metal Ion Stripping and Redox SilencingBioinorg Chem Appl · 2025
• Semax and Pro-Gly-Pro activate the transcription of neurotrophins and their receptor genes after cerebral ischemiaCell Mol Neurobiol · 2010
• Semax, an ACTH(4-10) analogue with nootropic properties, activates dopaminergic and serotoninergic brain systems in rodentsNeurochem Res · 2005
• The Potential of the Peptide Drug Semax and Its Derivative for Correcting Pathological Impairments in the Animal Model of Alzheimer's DiseaseActa Naturae · 2025
• Semax, an analog of ACTH((4-7)), regulates expression of immune response genes during ischemic brain injury in ratsMol Genet Genomics · 2017
• Semax, an analogue of adrenocorticotropin (4-10), binds specifically and increases levels of brain-derived neurotrophic factor protein in rat basal forebrainJ Neurochem · 2006
• Effects of Semax on the Default Mode Network of the BrainBull Exp Biol Med · 2018