At a glance: Selank is a seven-amino-acid peptide developed in Russia, built from tuftsin, a natural immune fragment. It is registered in Russia as an anti-anxiety nasal drop. Small Russian trials suggest it may ease anxiety about as well as a benzodiazepine without sedation, but those studies were small, short, often open-label and never replicated in Western trials. It is not FDA-approved, and US products are sold as unregulated "research" peptides.
What is Selank?
Selank is a synthetic heptapeptide (seven amino acids: Thr-Lys-Pro-Arg-Pro-Gly-Pro). It is based on tuftsin, a natural four-amino-acid fragment of an antibody (immunoglobulin G) that helps regulate immune cells. Researchers added three amino acids (Pro-Gly-Pro) to the end to make it more stable in the body.
It was developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, the same institute behind Semax, and is registered in Russia for generalized anxiety disorder and neurasthenia (a condition of fatigue and nervous exhaustion).
How does Selank work?
Its mechanism is not fully understood. Lab and animal studies point to several effects:
- GABA system: it appears to fine-tune GABA-A receptors, the same calming system benzodiazepines act on, and changes the activity of GABA-related genes
- Enkephalins: it slows the breakdown of enkephalins, the body's own calming, pain-relieving peptides
- Serotonin and noradrenaline: rat studies show changes in brain serotonin metabolism
- Immune effects: like tuftsin, it influences immune signaling molecules (cytokines) in lab and early patient studies
What the research shows so far
| Study | Who was studied | Main finding |
|---|---|---|
| Zozulya et al., 2008 | 62 patients with generalized anxiety or neurasthenia; 14 days; Selank vs the benzodiazepine medazepam | Similar anxiety reduction in both groups; Selank also eased fatigue. Open-label, no placebo |
| Medvedev et al., 2012 (abstract) | 20 adults with generalized anxiety disorder | Anxiety scores fell, some within 3 days. No control group |
| Medvedev et al., 2014-2015 | 70 patients with anxiety-related disorders; the benzodiazepine phenazepam with or without Selank | Adding Selank was linked to faster improvement and fewer benzodiazepine side effects. No placebo |
| Uchakina et al., 2008 | Patients with anxiety and fatigue disorders | Shifts in immune signaling molecules over 14 days |
| Animal studies | Rats and mice | Reduced anxiety-like behavior and changes in GABA and serotonin systems |
No placebo-controlled, peer-reviewed trials of Selank have been published outside Russia, and most papers are available only in Russian.
Why it gets attention
- Anxiety without sedation: promoted as a calmer alternative to benzodiazepines, without drowsiness or dependence
- Focus and memory: marketed as a nootropic for concentration and learning
- Immune claims: its tuftsin origin drives claims about antiviral or immune support
- Pairing with Semax: often sold alongside its sister peptide as a nasal "stack"
How it is used
In Russia, Selank is used as nasal drops. In the US it is sold mostly as nasal sprays or injectable powders labeled "for research use only," sometimes through clinics. These products are not FDA-reviewed for identity, purity or sterility, and no dose has been established in rigorous trials. This page does not provide dosing guidance.
What about side effects?
Russian studies reported Selank as well tolerated, without the drowsiness, memory problems or dependence typical of benzodiazepines. But they were small and short, so rare or long-term problems could be missed. Commonly reported effects include:
- Nasal irritation, headache, dizziness or tiredness
- Feeling overstimulated rather than calm in some users
- Anecdotal hair shedding, with no good evidence it is caused by Selank
- Unknown interactions with antidepressants, stimulants, benzodiazepines and other psychiatric medicines
- Pregnancy and breastfeeding: not studied
Anxiety disorders have well-studied treatments. Anyone with anxiety should see a clinician rather than self-treat with an unregulated peptide.
Regulatory status
- Registered as a medicine in Russia for generalized anxiety disorder and neurasthenia.
- Not FDA-approved for any use in the US, and not approved in Europe.
- Selank acetate was once on FDA's "Category 2" list of compounding substances with safety concerns, but was removed after the nominator withdrew it. It has not been reviewed for the compounding list, so there is no legal pathway for US pharmacies to compound it from bulk powder.
- Products sold online as "research chemicals" are not intended for human use.
Selank vs Semax
| Selank | Semax | |
|---|---|---|
| Based on | Tuftsin (immune fragment) | ACTH fragment (stress hormone) |
| Main claimed use | Anxiety, calm focus | Stroke recovery, cognition |
| Russian status | Registered for anxiety | Registered for stroke and other conditions |
| US status | Not approved; not reviewed for compounding | Not approved; reviewed by FDA advisers in 2026 |
The bottom line
Selank is an interesting peptide with a plausible calming mechanism and a medical track record in Russia. But the human evidence is thin: a handful of small, short, mostly open-label Russian studies, with no Western placebo-controlled trials. Claims that it matches benzodiazepines without side effects come from that limited data and from companies selling it. In the US it is unapproved and unregulated.
Frequently asked questions
What is Selank?
A synthetic version of tuftsin, a small immune peptide, with added amino acids to make it more stable.
How is Selank taken?
Nasal spray.
Is Selank FDA approved?
Not approved in the US; approved in Russia.
That means no regulator has reviewed its safety, effectiveness or manufacturing quality for this use.
What has research shown about Selank?
- Anxiety in Russian clinical studies.
- Effects on mood and memory in animal studies.
What side effects have been reported?
- Nasal irritation
Serious or less common risks are listed in the Side Effects section above.
What is still unknown about its safety?
Most of it. Selank has not been through the trials that establish long-term safety in people, and products sold online are made by unregulated labs. Independent testing of online peptides has repeatedly found contents that do not match the label.
References
- Cenegenics: What is Selank? Benefits, mechanism and uses for anxiety and cognition (commercial clinic). View source
- Dr. Lewis: Selank for anxiety, mechanism, evidence and what to realistically expect. View source
- Peptide Journal: Selank clinical research, Russian trial analysis (Zozulya 2008, Medvedev 2012-2015). View source
- FDA: Bulk drug substances nominated for use in compounding under section 503A (Selank acetate removed from Category 2). View source
- Frier Levitt: FDA to remove 12 peptides from the Category 2 list (April 2026). View source