Selank is a synthetic regulatory peptide that has been primarily studied for its potential effects on anxiety, stress resilience, cognitive function, emotional balance, and neuroprotection. Developed from the naturally occurring immunoregulatory peptide tuftsin and enhanced with the stabilizing Pro-Gly-Pro fragment, Selank appears to target multiple neurotransmitter systems simultaneously, rather than acting through a single biological target [1–3]. Individuals seeking more detailed information about this peptide can refer to our comprehensive guide on Selank: https://bioevidencehub.com/peptyd-selank/.
Unlike many conventional anti-anxiety medications that directly activate GABA receptors and can cause drowsiness, Selank appears to regulate several neurotransmitter and neuropeptide pathways associated with mood, cognitive function, and stress adaptation. Research suggests its actions involve the GABAergic, serotonergic, dopaminergic, and endogenous opioid systems, as well as pathways related to immune system function and neurotrophic support [1,3–5].
What does Selank do in the brain?
One of the best-known effects of Selank is its impact on the brain's GABA system. Laboratory studies suggest that Selank acts as a positive allosteric modulator of GABA receptors, meaning it can enhance the natural effects of GABA without directly activating the receptor itself [1].
GABA is the primary inhibitory neurotransmitter in the brain and plays a key role in regulating anxiety, stress responses, emotions, and relaxation processes. By supporting proper GABA signaling, Selank can promote a calmer mental state while inducing fewer sedative effects than traditional benzodiazepines [1,6].
Studies have also shown that Selank can affect gene expression within the central nervous system. Experiments observed changes in genes related to neurotransmission, inflammation, immune regulation, and neuroplasticity, suggesting a broad regulatory effect in the brain [7].
Anxiety and stress regulation
The most studied application of Selank is its potential anxiolytic effect, meaning its support for anxiety reduction. Several experimental and clinical.
One of the proposed mechanisms is the inhibition of enzymes responsible for enkephalin breakdown. Enkephalins are naturally occurring opioid peptides involved in mood regulation, stress adaptation, and emotional processing. Studies have shown that Selank can inhibit enkephalin degradation in a dose-dependent manner, and in laboratory conditions, its effect was stronger than that of some reference peptidases inhibitors [4].
By slowing the breakdown of these natural neuropeptides, Selank may prolong their action time and support emotional resilience in stressful situations.
Cognitive Functions and Mental Performance
In addition to its potential anti-anxiety properties, Selank has also been investigated for its nootropic effects. Studies suggest that it may support learning processes, memory formation, concentration, and information processing [3,5].
Experimental studies have shown that Selank can influence the expression of brain-derived neurotrophic factor (BDNF), a protein that plays a significant role in neuronal development, synaptic plasticity, and long-term memory consolidation [5]. Since BDNF is strongly associated with learning ability, adaptation, and cognitive resilience, these findings have generated interest in Selank as a potential peptide that supports cognitive functions.
Selank is often compared to Semax, another peptide developed as part of a Russian peptide research program. While Semax is more strongly associated with supporting cognitive function and neurotrophic effects, Selank is primarily researched for its role in regulating anxiety, emotional balance, and stress resilience. However, both peptides exhibit partially overlapping neuroprotective properties [3].
Neuroprotection and brain health
Research indicates that Selank may possess neuroprotective properties through several biological mechanisms. Experiments suggest an influence on pathways related to inflammation, oxidative stress response, immune regulation, and neurotrophic factors responsible for neuron survival and proper functioning [5,7].
The Pro-Gly-Pro fragment present in Selank's structure may also exhibit independent neuroprotective activity. Studies on related glyproline peptides have shown an effect on genes associated with inflammatory processes, immune response, and recovery from neurological damage [7].
Although these results are promising, most of the evidence regarding Selank's neuroprotective effects currently comes from laboratory studies and animal models. Further clinical trials in humans are needed.
Effects on the immune system
Since Selank is derived from tuftsin, a peptide that regulates immune system function, researchers have also investigated its potential impact on the immune response. Experimental studies have shown that Selank can affect cytokine production, immune signaling pathways, and the interferon response [9].
Additional studies showed antiviral activity in laboratory and animal models involving influenza viruses, herpes viruses, and encephalomyocarditis virus [9,10]. These results suggest that Selank may act as a neuroimmunoregulatory peptide affecting both the nervous and immune systems.
Selank can cause the following feelings: reduced anxiety, improved mood, increased mental clarity, and enhanced cognitive function.
Reactions to Selank can vary between individuals, and clinical data remain limited. However, published studies and clinical observations most commonly describe effects related to reduced anxiety levels, improved stress resistance, greater emotional stability, better concentration, increased clarity of thought, reduced mental fatigue, and a calmer state of mind without significant sedative effects [1,3,6].
Unlike many traditional anti-anxiety medications, Selank, in available studies, has shown minimal impact on memory, motor coordination, and alertness levels [1,4].
Does Selank actually work?
Current research suggests that Selank induces measurable biological effects, including neurotransmitter regulation, neuropeptide metabolism, gene expression, immune system functioning, and neurotrophic signaling [1–5,7].
Animal studies, mechanistic analyses, and regional clinical studies have indicated anxiolytic, cognitive-enhancing, and neuroprotective effects. In laboratory settings, effects on GABA receptor activity, inhibition of enkephalin degradation, regulation of BDNF expression, and modulation of the immune response have been demonstrated, among others [1,4,5,9].
However, it should be noted that a significant portion of the available data comes from preclinical and experimental studies, as well as research conducted primarily in Russia and neighboring countries. Large international clinical trials are still limited, therefore further work is needed to assess efficacy, optimal dosing, and long-term safety.
Main potential benefits associated with Selank
Based on current scientific literature, Selank has been investigated for its potential role in supporting anxiety reduction, stress resilience, emotional regulation, cognitive function, memory and learning, neuroprotection, BDNF regulation, immune modulation, antiviral activity, and mental performance during periods of increased psychological stress [1-10].
Disclaimer
The content presented in this article is for educational and informational purposes only and does not constitute medical advice, diagnosis, or therapeutic recommendations. Selank is not approved for all uses in many countries, and a significant portion of the available data comes from experimental, preclinical, or regional clinical studies. Further, large-scale clinical trials are necessary to confirm its efficacy, safety, and long-term effects of use.
For research purposes only: Selank products available at Semax Polska are intended solely for laboratory and scientific research. They are not intended for human consumption or for use in the diagnosis, treatment, prevention, or alleviation of any diseases. Researchers should use these materials in accordance with applicable laws, regulations, and guidelines for conducting scientific research.
References
[1] Vyunova, T. V., Andreeva, L. A., Shevchenko, K. V., & Myasoedov, N. F. (2018). Peptide-based anxiolytics: The molecular aspects of heptapeptide Selank's biological activity. Protein and Peptide Letters, 25(10), 914–923. https://doi.org/10.2174/0929866525666180925144642
[2] PubChem. (2026). Selank Compound Summary. National Center for Biotechnology Information. https://pubchem.ncbi.nlm.nih.gov/compound/Selank
[3] Myasoedov, N. F., & colleagues. (2017). Behavioral Neurology review discussing the neurobiological effects and cognitive activity of Selank. Behavioral Neurology. https://onlinelibrary.wiley.com/doi/full/10.1155/2017/5091027
[4] Zozulya, A. A., Kost, N. V., Sokolov, O. Y., Gabaeva, M. V., Grivennikov, I. A., Andreeva, L. N., Zolotarev, Y. A., Ivanov, S. V., Andryushchenko, A. V., Myasoedov, N. F., & Smulevich, A. B. (2001). The inhibitory effect of Selank on enkephalin-degrading enzymes as a possible mechanism of its anxiolytic activity. Bulletin of Experimental Biology and Medicine, 131(4), 315–317. https://doi.org/10.1023/A:1017979514274
[5] Levitskaya, N. G., Andreeva, L. A., Nagaev, I. Y., Mezentseva, M. V., Shapoval, I. M., Podchernyaeva, R. Y., Shcherbenko, V. E., Potapova, L. A., Russu, L. I., Ershov, F. I., & Myasoedov, N. F. (2010). Intranasal administration of the peptide Selank regulates BDNF expression in the rat hippocampus in vivo. Doklady Biological Sciences, 431, 79–82. Available from: https://www.researchgate.net/profile/Natalia-Levitskaya/publication/23306196
[6] Kost, N. V., Sokolov, O. Y., Zozulya, S. A., & Myasoedov, N. F. (2025). Combined action of benzodiazepine tranquilizers and peptide anxiolytic Selank in BALB/c mice. Neurochemical Journal, 19, 743–748. https://doi.org/10.1134/S1819712425700783
[7] Medvedeva, E. V., Dmitrieva, V. G., Povarova, O. V., Limborskaya, S. A., Skvortsova, V. I., Myasoedov, N. F., & Dergunova, L. V. (2014). Effect of tripeptide Pro-Gly-Pro on rat brain transcriptome in focal ischemia. Molecular Biology, 48(2), 277–287. PMID: 25850296
[8] Czabak-Garbacz, R., Cygan, B., Wolański, Ł., & Kozlovsky, I. (2006). Influence of long-term treatment with tuftsin analogue TP-7 on anxiety-phobic states and body weight. Pharmacological Reports, 58(4), 562–567. PMID: 16963804
[9] Andreeva, L. A., Nagaev, I. Y., Mezentseva, M. V., Shapoval, I. M., Podchernyaeva, R. Y., Shcherbenko, V. E., Potapova, L. A., Russu, L. I., Ershov, F. I., & Myasoedov, N. F. (2010). Antiviral properties of structural fragments of the peptide Selank. Doklady Biological Sciences, 431(1), 79–82. https://doi.org/10.1134/S0012496610020031
[10] Andreeva, L. A., Nagaev, I. Y., Mezentseva, M. V., Shapoval, I. M., Podchernyaeva, R. Y., Shcherbenko, V. E., Potapova, L. A., Russu, L. I., Ershov, F. I., & Myasoedov, N. F. (2010). Antiviral properties of structural fragments of the peptide Selank. Doklady Biological Sciences, 431(1), 79–82. https://doi.org/10.1134/S0012496610020031