Semax vs Selank: A Cognitive-Research Comparison
A neutral research overview of two Russian-developed peptides studied in cognitive and neuropeptide models — their origins, mechanisms, and research focuses.
Semax and Selank are both short peptides developed in Russia and studied widely in cognitive and neuropeptide research. They are frequently compared because they emerged from related research programmes and are both available in nasal-spray formats for laboratory study. They are, however, distinct molecules associated with different research focuses.
| Semax | Selank | |
|---|---|---|
| Origin | Synthetic peptide derived from an ACTH fragment | Synthetic peptide derived from the immunopeptide tuftsin |
| Research focus | Neuroprotection and BDNF-related signalling models | Anxiety and immunomodulation research models |
| Mechanism studied | Modulation of neurotrophic factor expression | Modulation of GABAergic and immune pathways |
| Format | Nasal spray (lyophilised source) | Nasal spray (lyophilised source) |
Semax — research overview
Semax is studied in preclinical neuroscience for its relationship to brain-derived neurotrophic factor (BDNF) and neuroprotective signalling. See our detailed note on Semax and BDNF neuroprotection research.
Selank — research overview
Selank is studied in models of anxiety and immunomodulation, with research attention on GABAergic pathways. See our overview of Selank anxiety research.
Key differences researchers note
While both trace to Russian neuropeptide research and share a nasal-spray research format, Semax research centres on neurotrophic and neuroprotective pathways, whereas Selank research centres on anxiolytic and immune-modulating pathways. Some research designs study them together, which is why the Limitless research stack pairs them.
Research considerations
Both are third-party tested with a published Certificate of Analysis — verify any batch or read the Quality Report.
*Research use only. Semax and Selank are sold strictly for in vitro laboratory research and are not for human or veterinary use.*