Researchers seeking to buy Selank and buy Semax are studying two of Russia’s most investigated nootropic peptides — both developed by the Institute of Molecular Genetics of the Russian Academy of Sciences and representing a decades-long research program into synthetic peptide nootropics. Selank and Semax are structurally distinct peptides with different primary mechanisms, but both are studied in the context of cognitive function, anxiety modulation, and neurotrophic signalling in preclinical models. EdgeChems supplies both Selank for sale and Semax for sale as HPLC-verified research compounds at ≥98% purity.
What Is Selank?
Selank (TBGE-Gly-Pro-Arg-Pro-Gly-Pro) is a synthetic heptapeptide based on the sequence of tuftsin (Thr-Lys-Pro-Arg) — an endogenous immunomodulatory peptide. Tuftsin was modified by the addition of a stabilising Pro-Gly-Pro tripeptide extension, dramatically increasing its plasma stability and CNS penetration compared to native tuftsin. Selank was originally developed as an anxiolytic research tool and is one of the most studied peptide anxiolytics in the Russian neuroscience literature, with a research track record spanning more than 30 years.
Selank Mechanisms
- GABAergic modulation: Selank is hypothesized to modulate GABA-A receptor sensitivity — consistent with its anxiolytic profile in animal stress models, though the exact receptor binding site differs from benzodiazepine mechanisms.
- BDNF and NGF upregulation: Research in rodent models shows Selank increases brain-derived neurotrophic factor (BDNF) and nerve growth factor (NGF) expression in hippocampal tissue — neurotrophins associated with synaptic plasticity and memory consolidation.
- Serotonin system modulation: Selank affects serotonin transporter expression and turnover in animal models, influencing 5-HT signalling relevant to anxiety and mood research.
- Immune-CNS interface: Derived from the immunopeptide tuftsin, Selank retains some immune regulatory activity and is studied for its effects on the immune-brain axis — including modulation of interleukin expression in stress models.
What Is Semax?
Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic heptapeptide analogue of ACTH(4-10) — the core bioactive sequence of adrenocorticotropic hormone stripped of its corticosteroid-stimulating activity. ACTH(4-10) was known to possess cognitive-enhancing properties in animal models but had a very short plasma half-life. Semax adds a C-terminal Pro-Gly-Pro extension (the same stabilising motif as Selank) to extend CNS activity duration while removing the adrenal stimulation of native ACTH.
Semax Mechanisms
- BDNF and TrkB receptor upregulation: Semax robustly upregulates BDNF expression in the hippocampus, prefrontal cortex, and other CNS regions in rodent studies — with effects comparable to or exceeding antidepressants in some models. TrkB (BDNF’s primary receptor) is also upregulated, amplifying neurotrophic signalling.
- Dopamine and serotonin modulation: Semax modulates dopaminergic and serotonergic transmission in animal models, with particular effects in the striatum and limbic system relevant to reward, attention, and anxiety research.
- Neuroprotection in ischemia models: Multiple rodent stroke and ischemia studies show Semax reduces infarct volume, neuronal apoptosis markers, and cognitive deficit scores compared to controls. This is one of Semax’s most replicated research findings.
- Serotonin transporter modulation: Like Selank, Semax affects SERT expression and function — affecting synaptic 5-HT availability in relevant brain regions.
Selank vs Semax: Research Distinctions
| Property | Selank | Semax |
|---|---|---|
| Peptide base | Tuftsin analogue | ACTH(4-10) analogue |
| Primary research focus | Anxiety, anxiolytic mechanisms | Cognitive enhancement, neuroprotection |
| BDNF effects | Moderate upregulation | Strong upregulation (primary mechanism) |
| Immune modulation | Yes (tuftsin heritage) | Minimal |
| Stroke/ischemia models | Limited data | Extensively studied |
| Available from EdgeChems | Selank | Semax |
Dihexa: Advanced Nootropic for Synapse Research
Researchers studying nootropic peptides should also consider Dihexa — a small peptidomimetic compound developed at Washington State University that acts as a potent HGF/MET receptor modulator. Dihexa has shown remarkable activity in animal cognitive models, with effects in some paradigms far exceeding established cognitive enhancers. It represents a distinct mechanism from Selank and Semax and is studied for synaptogenesis, synaptic density, and reversal of cognitive deficits in animal models of neurodegeneration.
Product Specifications
- Selank: ≥98% purity, HPLC verified — order Selank for sale
- Semax: ≥98% purity, HPLC verified — order Semax for sale
- Format: Liquid solution (both)
- Storage: -20°C, protected from light
Research Applications Summary
- Anxiety and anxiolytic mechanism research (Selank)
- BDNF and neurotrophic signalling studies (both, Semax stronger)
- Neuroprotection and ischemia models (Semax)
- Serotonin and dopamine system modulation studies
- Cognitive function and memory research in animal models
- Immune-CNS interface research (Selank)
For research purposes only. Not intended for human or veterinary use. All information is presented for scientific reference.