Selank is a synthetic regulatory peptide that has primarily been investigated for its potential effects on anxiety, stress resistance, cognitive function, emotional balance, and neuroprotection. Developed from the naturally occurring immunoregulatory peptide tuftsin and enhanced with the stability-increasing Pro-Gly-Pro fragment, Selank appears to interact with multiple neurotransmitter systems simultaneously, rather than acting via a single biological target [1–3]. Those seeking more in-depth information regarding this peptide may refer to our comprehensive guide to Selank: https://bioevidencehub.com/peptyd-selank/.
Unlike many conventional anti-anxiety medications, which 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 action involves the GABAergic, serotonergic, dopaminergic, and endogenous opioid systems, as well as pathways related to immune system function and neurotrophic support [1,3–5].
Co Selank robi w mózgu?
One of the best-known effects of Selank is its influence 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 crucial role in regulating anxiety, stress responses, emotions, and relaxation processes. By supporting proper GABA signalling, Selank can promote a calmer mental state while inducing fewer sedative effects than traditional benzodiazepines [1,6].
Research has also shown that Selank can influence gene expression within the central nervous system. Changes in genes related to neurotransmission, inflammation, immune regulation, and neuroplasticity have been observed in experiments, suggesting a broad regulatory effect in the brain [7].
Anxiety and stress management
The most frequently studied application of Selank is its potential anxiolytic effect, meaning its ability to support anxiety reduction. Several experimental and clinical studies have shown a decrease in anxiety-related behaviours while maintaining normal cognitive function and motor skills [4,8].
One of the proposed mechanisms is the inhibition of enzymes responsible for the breakdown of enkephalins. 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 under laboratory conditions, its effect was stronger than some reference peptidase inhibitors [4].
By slowing the breakdown of these natural neuropeptides, Selank may prolong their effect 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 demonstrated 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]. As BDNF is strongly linked to learning ability, adaptation, and cognitive resilience, these findings have sparked interest in Selank as a potential peptide for supporting cognitive functions.
Selank is often compared with Semax – another peptide developed as part of a Russian peptide research programme. While Semax is more strongly associated with supporting cognitive functions and neurotrophic action, Selank is primarily studied for its regulation of anxiety, emotional balance, and stress resistance. 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 the Selank structure may also exhibit independent neuroprotective activity. Studies on related glyproline peptides have shown an influence on genes associated with inflammatory processes, immune response, and regeneration after 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.
Impact on the immune system
Since Selank is derived from tuftsin – a peptide that regulates the immune system – scientists have also investigated its potential effect on the immune response. Experimental studies have shown that Selank can influence cytokine production, immune signalling pathways, and the interferon response [9].
Further studies have demonstrated antiviral activity in laboratory and animal models, including influenza viruses, herpes viruses, and the myocarditis and encephalitis virus [9,10]. These findings suggest that Selank may act as a neuroimmunomodulatory peptide, influencing both the nervous and immune systems.
Selank can potentially cause the following feelings: * **Reduced anxiety:** It is often described as having an anxiolytic effect, meaning it can help to calm the nerves and reduce feelings of worry or apprehension. * **Improved mood:** Users might experience a lift in their mood, feeling more positive or optimistic. * **Enhanced cognitive function:** Some people report improvements in concentration, mental clarity, and memory. * **Increased mental energy/alertness:** It can potentially lead to a feeling of being more awake and mentally active. * **Mild euphoria or well-being:** In some cases, a sense of general well-being or mild pleasure might be experienced. * **Relaxation:** A feeling of calm and physical relaxation can also occur. It's important to note that individual responses can vary greatly, and not everyone will experience these effects. Some people might experience no noticeable effects, while others could have different or even negative reactions.
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 resilience, greater emotional stability, better concentration, increased clarity of thought, reduction in mental fatigue, and a calmer state of mind without a distinct sedative effect [1,3,6].
In contrast to many traditional anti-anxiety medications, Selank, in available studies, has demonstrated minimal impact on memory, motor coordination, and alertness levels [1,4].
Does Selank actually work?
Current research suggests that Selank causes measurable biological effects including neurotransmitter regulation, neuropeptide metabolism, gene expression, immune system functioning, and neurotrophic signalling [1–5,7].
Animal studies, mechanistic analyses, and regional clinical studies have indicated anxiolytic, cognitive-enhancing, and neuroprotective effects. In laboratory conditions, 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 borne in mind that a significant portion of the available data comes from preclinical and experimental studies, as well as studies conducted mainly in Russia and neighbouring countries. Large international clinical trials remain limited, therefore further work is needed to assess efficacy, optimal dosing, and long-term safety.
Main potential benefits of 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 load [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 required to confirm its efficacy, safety, and long-term effects.
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 governing scientific research.
References
[1] Vyunova, T. V., Andreeva, L. A., Shevchenko, K. V., & Myasoedov, N. F. (2018). Peptide-based anxiolytics: The molecular aspects of the 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 Centre for Biotechnology Information. https://pubchem.ncbi.nlm.nih.gov/compound/Selank
[3] Myasoedov, N. F., & colleagues. (2017). Behavioural Neurology review discussing Selank neurobiological effects and cognitive activity. 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 ischaemia. 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