Selank nasal spray is the most well-researched form of administration for this peptide. Almost all published studies on humans and animals using Selank have relied on nasal administration, making it the method of delivery with the strongest scientific support [1-4].
Developed in Russia, Selank is a synthetic peptide derived from the naturally occurring immunoregulatory peptide, tuftsin. It was specifically designed for intranasal administration, allowing for absorption through the nasal mucosa and bypassing a significant portion of the degradation that occurs in the gastrointestinal tract [1,5].
If you want to learn more about the mechanisms of action, properties, and applications of this peptide, also read our main guide: https://bioevidencehub.com/peptyd-selank/.
What is Selank Nasal Spray?
Selank nasal spray contains a synthetic heptapeptide with the amino acid sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP). The peptide was developed by modifying tuftsin and adding a Pro-Gly-Pro fragment, which increases its stability and prolongs its biological activity [5,6].
Research suggests that Selank may affect several biological systems related to anxiety regulation, stress adaptation, mental resilience, cognitive functions, neuroplasticity, and immune system function [1–4,7].
Since peptides are usually broken down in the gastrointestinal tract, intranasal administration has become the preferred route of administration in both scientific research and clinical observations.
Why is Selank Administered Intranasally?
Nasal administration is a unique route for peptide delivery, as some compounds can reach the central nervous system structures more effectively than after oral administration.
Many studies on Selank have used the intranasal route when analyzing anxiety-related behaviors, GABA receptor activity, BDNF regulation, neurotransmitter function, cognitive abilities, and immunomodulatory effects [1–4,7].
One of the significant studies showed that intranasal Selank affected the expression of brain-derived neurotrophic factor (BDNF) in the hippocampus – a brain structure strongly associated with memory, learning, and neuroplasticity [3].
Does Selank Nasal Spray Work?
Current research suggests that Selank induces measurable biological effects in both laboratory and clinical settings.
Research has shown that Selank can modulate GABA receptor activity, inhibit enzymes responsible for enkephalin breakdown, affect gene expression related to neurotransmission and immune regulation, regulate BDNF expression, and exhibit anxiolytic effects without significant sedative action [1,3,8,9].
Animal studies have consistently shown a reduction in anxiety-related behaviors, while mechanistic studies suggest multiple pathways through which Selank may influence mood, cognitive function, and stress resistance [1,3,8].
Although the results are promising, most of the available data comes from Russian clinical and preclinical trials. Larger international clinical trials are needed to more accurately assess efficacy, safety, and potential clinical applications.
Dosage of Nasal Spray Selank
Currently, there are no widely accepted dosing guidelines based on large international clinical trials.
In published studies, various nasal dosing regimens were used depending on the study's objective [1–4].
In the field of peptide research, the most commonly discussed daily ranges include:
| Typical range | Daily amount |
|---|---|
| Low dose | 250–500 mcg |
| Moderate dose | 500–1000 mcg |
| Higher dose | 1000–2000 mcg |
It is worth remembering that these values mainly result from observational protocols and clinical practice, not from official medical recommendations.
How to Use Selank Nasal Spray
Most published studies using Selank have relied on intranasal administration.
General rules for using nasal sprays include gently clearing the nose before application, placing the applicator in one nostril, administering the correct amount of the preparation, and repeating the process in the other nostril if necessary. Typically, avoid strong inhalation immediately after application to limit the runoff of the preparation and increase its contact with the nasal mucous membrane.
Detailed instructions may vary depending on the concentration, formulation, and dispensing device used.
How Quickly Does Selank Nasal Spray Work?
Most scientific research focuses on biological effects, not on subjective felt time of action.
Research indicates that Selank may affect neurotransmitter systems, neuropeptide activity, and neurotrophic pathways relatively quickly after administration [1–3]. Some experiments have shown measurable neurobiological changes after a short period of use, while long-term studies have described sustained anxiolytic effects after several weeks of administration [8].
However, the biological response can vary significantly depending on the research model, protocol, and individual biological factors.
Does Selank Nasal Spray Require Refrigeration?
Scientific publications rarely specify exact storage conditions, as individual formulations may vary.
The stability of a peptide depends on many factors, such as concentration, presence of preservatives, solution composition, manufacturing process, and whether the preparation has been previously dissolved.
Many peptide preparations are stored under refrigerated conditions to maintain stability, however, you should always follow the manufacturer's recommendations for the specific product.
How to Store Selank Nasal Spray
Storage recommendations depend on the manufacturer and formulation.
Typical practices include protecting the product from high temperatures, avoiding prolonged exposure to sunlight, refrigerating if recommended, and avoiding multiple freeze-thaw cycles.
Manufacturer instructions should always take precedence over general storage guidelines.
Opinions on Nasal Spray Selank – What Does Research Say?
Although individual experiences may vary, published studies most often describe effects related to reduced anxiety, improved stress resilience, enhanced emotional regulation, support for cognitive functions, and minimal sedative effects compared to traditional anti-anxiety medications [1,8].
Research has also shown that Selank can enhance some of the anxiolytic effects of benzodiazepines, while simultaneously reducing some of their sedative effects and negative impact on motor coordination in animal models [10].
When evaluating the potential properties of Selank, controlled scientific studies are more valuable than individual user reports.
Key Information
Selank nasal spray is the best-researched form of administration for this peptide. Most published human and animal studies have utilized the intranasal route, making it the method with the strongest scientific support.
Research suggests that Selank may affect anxiety, stress resistance, emotional regulation, cognitive function, neuroplasticity, and the immune system through mechanisms related to GABA activity, enkephalin metabolism, BDNF regulation, and gene expression.
Despite the existence of frequently discussed dosing ranges, there are currently no widely accepted guidelines for its use. Further large-scale clinical studies are needed to better determine efficacy, safety, optimal dosing strategies, and long-term effects.
Disclaimer
The content contained in this article is for educational and informational purposes only. It does not constitute medical advice, diagnosis, treatment, or dosage recommendations. Selank is not approved for all uses in many countries, and most of the available data comes from experimental, preclinical, or regional studies. Further large-scale clinical trials are needed to confirm efficacy, safety, optimal dosing, 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 standards 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] Behavioral Neurology Review. (2017). Neurobiological effects and therapeutic potential of Selank. Behavioral Neurology. https://onlinelibrary.wiley.com/doi/full/10.1155/2017/5091027
[3] 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 at: https://www.researchgate.net/profile/Natalia-Levitskaya/publication/23306196
[4] Letters to the Journal of Experimental and Clinical Pharmacology. Clinical investigations involving intranasal Selank. https://www.pismin.com/10.1134/S1062359019040071
[5] PubChem. (2026). Selank Compound Summary. National Center for Biotechnology Information. https://pubchem.ncbi.nlm.nih.gov/compound/Selank
[6] 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
[7] Zozulia, A. A., Neznamov, G. G., Syunyakov, T. S., Kost, N. V., Gabaeva, M. V., Sokolov, O. Y., Serebryakova, E. V., Siranchieva, O. A., Andryushenko, A. V., Telesheva, E. S., Syunyakov, S. A., Smulevich, A. B., Myasoedov, N. F., & Seredenin, S. B. (2008). Efficacy and possible mechanisms of action of a new peptide anxiolytic selank in the therapy of generalized anxiety disorders and neurasthenia. Journal of Neurology and Psychiatry named after S.S. Korsakov, 108(4), 38–48. PMID: 18454096. https://pubmed.ncbi.nlm.nih.gov/18454096/
[8] 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
[9] 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. https://pubmed.ncbi.nlm.nih.gov/25850296/
[10] 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