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Selank is a synthetic peptide, equivalent to the naturally occurring Tuftsin, capable of modifying or regulating one or more immune functions. However, Selank is more stable and has a longer half-life. Research demonstrates Selank’s ability to reduce anxiety, lower stress levels, improve mood, and promote memory retention and learning. Selank has a sedative effect like benzodiazepines, however Selank has not been shown to be habit-forming and does not cause withdrawal or amnesia.

Research in rats shows that Selank modulates GABA signaling genes. The research indicates that Selank can alter the expression of nerve cell genes and that the effects may be caused by changing the affinity of the GABA receptor [1].

Research in rats shows that Selank and benzodiazepines have similar effects on anxiety disorders. Selank has a small advantage over benzodiazepines when tackling high anxiety levels, but when used in sequence, the two treatments together appear to have the best results for treating chronic mild stress that is unpredictable [2].

Selank’s effects are most likely caused by inhibiting the enzyme that breaks down circulating enkephalins and other peptides. People with anxiety and phobic disorders produce more enzymes to break down these peptides, causing the enkephalins in their bloodstream to have shorter half-lives when tested during anxiety [3]. Selank may be helping to protect the body’s natural anxiolytic peptides by resetting this enzymatic pathway. Research in anxiety prone mice shows that some of the effects from Selank are caused by the prevention of enkephalin degradation [4].

Research has shown that Selank can suppress the gene that produces an inflammatory cytokine in patients with depression. This gene suppression does not appear to take place in healthy individuals and is only observed in patients with depression [5]. This research may indicate that Selank is useful in treating disorders in which anxiety causes symptoms such as fatigue, headache, heart palpitations, high blood pressure, nerve pain, and depression. Benzodiazepines and Selank show similar benefits in reducing anxiety, but Selank is also able to reduce fatigue and pain [6]. The effect on pain and fatigue may be because Selank can slow the of breakdown of enkephalins, the body’s natural pain killers. When Selank was tested in rats, results demonstrated that the peptide regulates the expression of genes affecting chemokines, cytokines, and receptors for both that are involved with the body’s inflammatory processes. Selank has specifically been found to alter the expression of the BcI6 gene that is primarily involved in the development of the immune system [7]. Further testing showed Selank temporarily changes C3, CAsp1, Il2rf, and Xcr1 gene expression in the mouse spleen. Selank can change the balance of the immune system and cause modulation of inflammation by affecting these genes [8].

It is known that increased anxiety leads to decreased ability to store new information or recall memories. Anxiety medication can reduce the negative correlation between anxiety and learning/memory, however Selank appears to boost cognition directly. Research in rats shows that Selank boosts the stability of trace memory and, in turn, causes an increase in the process of memory storage, regardless of the anxiety levels of the rats [9]. This research indicates that the peptide can do more than simply reduce stress-related impairment of memory. It appears that by altering the expression of genes in the hippocampus, Selank may increase memory. Research shows changes in mRNA levels of 36 different genes after Selank was administered to rats. The majority of these genes encode proteins associated with the plasma membrane and can regulate ion-dependent processes in learning and memory [7]. 

In one study on rats treated with Selank following brain damage induced by a neurotoxin, rats’ cognitive processes were restored. This research suggests that Selank can restore learning and memory after brain damage has occurred. The restorative effects appear to be related to Selank’s ability to cause inhibition of the catecholamine system in the brain [10]. 

Enkephalins are natural peptides that bind to opioid receptors to reduce the sensation of pain. Selank can reduce the enzymes found in human blood that break down these natural enkephalins [11]. These peptides are also found in high levels in the brain and adrenal glands and act in the human stress response. Selank may help to reduce normal stress response and the effects that it has on memory, learning, and concentration by regulating the levels of enkephalins in the brain.


Data on our Selank for sale


CAS Number: 129954-34-3

Formula: C33H57N11O9

Sequence: Thr-Lys-Pro-Arg-Pro-Gly-Pro

Molar Mass:  811.9 g/mol

Class: Hexapeptide

Experimental Application: Anti anxiolytic, memory, cognition, pain relief

Storage: Keep refrigerated upon reconstitution.


  • Lyophilized sample in sterile glass vial.
  • Minimum 98% pure.
  • 5mg Selank peptide per vial.
  • Diluent and laboratory supplies not included.


This preparation is for in vitro laboratory research purposes only by licensed professionals and is not approved by the FDA for bodily introduction of any kind into humans or animals. Selank peptide is not a drug, food, supplement, or cosmetic and may not be misbranded, misused, or mislabeled as a drug, food, supplement or cosmetic. 


Why buy Selank peptide from Sports Technology Labs?


If you are trying to figure out where to buy Selank peptide, considered by many researchers to be the best peptide for healing, there are many options out there. To buy Selank from a randomly selected company is dangerous. Most companies with peptides for sale, sad to say, do not test their products or hide their certificates or contact information for their third party labs from customers. What can they be hiding?

At Sports Technology Labs you can find the best Selank for sale anywhere on the internet. When you buy peptides from Sports Technology Labs you are choosing the highest quality ingredients. Pure compounds tested and certified by accredited American third party labs that accept phone calls to verify the validity of their certificates. Our products come lyophilized in glass bottles and are stored in refrigeration to prevent degradation in storage. We run a transparent business, with no discreet payment methods necessary and no misrepresentation of our products, only the highest quality research chemicals available online, secured by our 60-day money-back guarantee.

Sports Technology Labs is the best place to buy Selank online because of our consistent, verifiable high quality products, safe bottling and packaging, fast shipping, and great customer service. And if you have any questions about our Selank and other products, you can also contact us and we’ll respond as soon as possible.




1. Volkova A, Shadrina M, Kolomin T, Andreeva L, Limborska S, Myasoedov N, Slominsky P. Selank Administration Affects the Expression of Some Genes Involved in GABAergic Neurotransmission. Front Pharmacol. 2016 Feb 18;7:31. doi: 10.3389/fphar.2016.00031. PMID: 26924987; PMCID: PMC4757669.

2. Kasian A, Kolomin T, Andreeva L, Bondarenko E, Myasoedov N, Slominsky P, Shadrina M. Peptide Selank Enhances the Effect of Diazepam in Reducing Anxiety in Unpredictable Chronic Mild Stress Conditions in Rats. Behav Neurol. 2017;2017:5091027. doi: 10.1155/2017/5091027. Epub 2017 Feb 9. PMID: 28280289; PMCID: PMC5322660.

3. Zozulya AA, Kost NV, Yu Sokolov O, Gabaeva MV, Grivennikov IA, Andreeva LN, Zolotarev YA, Ivanov SV, Andryushchenko AV, Myasoedov NF, Smulevich AB. The inhibitory effect of Selank on enkephalin-degrading enzymes as a possible mechanism of its anxiolytic activity. Bull Exp Biol Med. 2001 Apr;131(4):315-7. doi: 10.1023/a:1017979514274. PMID: 11550013.

4. Sokolov OY, Meshavkin VK, Kost NV, Zozulya AA. Effects of Selank on behavioral reactions and activities of plasma enkephalin-degrading enzymes in mice with different phenotypes of emotional and stress reactions. Bull Exp Biol Med. 2002 Feb;133(2):133-5. doi: 10.1023/a:1015582302311. PMID: 12432865.

5. Uchakina ON, Uchakin PN, Miasoedov NF, Andreeva LA, Shcherbenko VE, Mezentseva MV, Gabaeva MV, Sokolov OIu, Zozulia AA, Ershov FI. [Immunomodulatory effects of selank in patients with anxiety-asthenic disorders]. Zh Nevrol Psikhiatr Im S S Korsakova. 2008;108(5):71-5. Russian. PMID: 18577961.

6. Zozulia AA, Neznamov GG, Siuniakov TS, Kost NV, Gabaeva MV, Sokolov OIu, Serebriakova EV, Siranchieva OA, Andriushenko AV, Telesheva ES, Siuniakov SA, Smulevich AB, Miasoedov NF, Seredenin SB. [Efficacy and possible mechanisms of action of a new peptide anxiolytic selank in the therapy of generalized anxiety disorders and neurasthenia]. Zh Nevrol Psikhiatr Im S S Korsakova. 2008;108(4):38-48. Russian. PMID: 18454096.

7. Kolomin T, Shadrina M, Andreeva L, Slominsky P, Limborska S, Myasoedov N. Expression of inflammation-related genes in mouse spleen under tuftsin analog Selank. Regul Pept. 2011 Oct 10;170(1-3):18-23. doi: 10.1016/j.regpep.2011.05.001. Epub 2011 May 24. PMID: 21609736.

8. Agapova TIu, Agniullin IaV, Silachev DN, Shadrina MI, Slominskiĭ PA, Shram SI, Limborskaia SA, Miasoedov NF. [Effect of semax on the temporary dynamics of brain-derived neurotrophic factor and nerve growth factor gene expression in the rat hippocampus and frontal cortex]. Mol Gen Mikrobiol Virusol. 2008;(3):28-32. Russian. PMID: 18756821.

9. Semenova TP, Kozlovskiĭ II, Zakharova NM, Kozlovskaia MM. [Experimental optimization of learning and memory processes by selank]. Eksp Klin Farmakol. 2010 Aug;73(8):2-5. Russian. PMID: 20919548.

10. Semenova TP, Kozlovskaya MM, Zakharova NM, Kozlovskii II, Zuikov AV. Effect of selank on cognitive processes after damage inflicted to the cerebral catecholamine system during early ontogeny. Bull Exp Biol Med. 2007 Nov;144(5):689-91. doi: 10.1007/s10517-007-0406-2. PMID: 18683497.

11. Kost NV, Sokolov OIu, Gabaeva MV, Grivennikov IA, Andreeva LA, Miasoedov NF, Zozulia AA. Ingibiruiushchee deĭstvie semaksa i selanka na énkefalindegradiruiushchie fermenty syvorotki krovi cheloveka [Semax and selank inhibit the enkephalin-degrading enzymes from human serum]]. Bioorg Khim. 2001 May-Jun;27(3):180-3. Russian. doi: 10.1023/a:1011373002885. PMID: 11443939.

Selank 5mg

Additional information

Weight 0.25 oz
Dimensions 2 × 1 × 1 in