Selank
Written by Michael Carroll — Owner, Director of Research · Reviewed by the Peptide Initiative Research Team · Editorial standards
Suggested dose
900 – 2,700 mcg/day
900 mcg/day total (3 doses of 300 mcg)
Registered label dose
2,700 mcg/day total (3 doses of 900 mcg)
Highest dose studied
Compound profile
Scientific & efficacy data
Cognitive
Peptide profile
Limited human trials
Selank
900 mcg/day total (3 doses of 300 mcg) · 3 times daily
Molecular formula
C33H57N11O9
- Mol. weight
- 751.9 g/mol
- CAS number
- 129954-34-3
- PubChem
- 11765600
- Developed · 1990
- Nikolai F. Myasoedov, PhD
Institute of Molecular Genetics, Russian Academy of Sciences & V.V. Zakusov Research Institute of Pharmacology
Amino acid sequence
Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP)Anxiety Relief
In 62 people with generalised anxiety disorder or neurasthenia, selank calmed anxiety about as well as the benzodiazepine medazepam on the Hamilton, Zung and CGI scales, and also reduced fatigue where medazepam did not [9]. A second trial in 60 people with phobic-anxiety and somatoform disorders found a clear anxiolytic effect that lasted about a week after the last dose [3]. Both trials are Russian, 14 days long, and had no placebo arm. The registered label lists no sedative or muscle-relaxant effect [7].
Cognitive Enhancement
The memory evidence is animal work: in rats, selank protected against alcohol-induced memory impairment by preserving BDNF in the hippocampus and prefrontal cortex [2]. In people, the 60-person phenazepam trial described a mild nootropic effect alongside the anxiolytic one [3], and the label notes selank does not impair cognition and can be used by people whose work needs attention and coordination [7]. No human trial has measured memory or focus as its main outcome.
Immune Support
In people with anxiety-asthenic disorders taking selank for 14 days, the balance of Th1 and Th2 cytokines in serum shifted, and in cell culture selank suppressed IL-6 gene expression in blood cells from patients but not from healthy controls [5]. The rest of the immune evidence is from mice, where selank and its fragments changed expression of genes for chemokines, cytokines and their receptors in the spleen [4][8]. No trial has tested whether any of this changes how often people get ill.
Dosing
How much do I take?
900 mcg/day total (3 doses of 300 mcg), titrated to 2,700 mcg/day total (3 doses of 900 mcg) · 900 mcg (12 drops) 3 times daily · intranasal
900 – 2,700 mcg/day
Covers all 3 documented dose levels · 2 administration routes · timing · dose-adjustment guidance.
Suitability
Is this right for me?
Best for anxiety relief without sedation & cognitive enhancement and focus
Best for
Anxiety Without the Fog
If traditional anti-anxiety medications leave you feeling sedated, foggy, or 'not yourself,' Selank offers a refreshing alternative. It calms anxious thoughts while keeping your mind sharp—like turning down the volume on worry without muting your brain [1].
Cognitive Performers
Students, professionals, and anyone facing demanding mental tasks love Selank for its dual action. It simultaneously reduces performance anxiety while enhancing memory and focus—the best of both worlds when you need to think clearly under pressure [1][2].
Stress Resilience Seekers
Chronic stress wreaks havoc on your brain. Selank helps protect against stress-induced cognitive decline by supporting BDNF levels and modulating your stress response [2]. Think of it as building a buffer between you and life's daily pressures.
Natural Approach Enthusiasts
Derived from tuftsin—a natural peptide your own immune system produces—Selank appeals to those seeking more 'natural' solutions [4]. It works with your body's existing systems rather than overriding them like synthetic drugs.
Consider alternatives if
Do not use if
Use with caution if
Not sure?
Compare Selank with similar peptides to find the best fit for your goals.
Administration
How do I use it?
Intranasal · Subcutaneous injection
Route
Subcutaneous injection (just under the skin) or intranasal spray—nasal delivery is most popular for Selank due to convenience and rapid absorption to the brain
Best sites
Covers reconstitution · step-by-step technique · storage · a sample daily schedule.
Safety
Is it safe?
4 common side effects · 1 serious
The safety record comes from small Russian trials, and the numbers are worth seeing.
In the 62-person generalised-anxiety and neurasthenia trial, 30 people took selank at 2,700 mcg a day and 32 took medazepam 30 mg a day for 14 days; the two calmed anxiety about equally, and selank also reduced fatigue where the benzodiazepine did not [9].
A second trial of 60 people with phobic-anxiety and somatoform disorders compared it with phenazepam and reported a clear anxiolytic effect that lasted about a week after the last dose [3].
The registered label lists only two side effects — an unpleasant taste when the drops run from the nose into the throat, and allergic reactions in people sensitive to the ingredients — and records no cases of overdose, which it attributes to how fast the peptide breaks down [7].
Neither trial published a per-arm adverse-event rate, so there is no side-effect percentage to compare against placebo.
Five human trials, all Russian and all published in Russian: 62 people against medazepam [9], 60 against phenazepam [3], 70 on phenazepam with or without selank [10], an immune-marker study in anxiety-asthenic disorders [5], and 64 people with post-COVID asthenia [11].
Four ran 14 days; the post-COVID study ran 30 days at four administrations a day rather than the label's three, and the two regimens are reported here as they stand rather than reconciled.
None was placebo-controlled, none reports adverse events arm by arm, and there is no trial outside Russia and no long-term safety study. The product has been registered in Russia since 2009 as 0.15% nasal drops [7].
One further gap: no study has tested selank by subcutaneous injection, so any injected dose is community practice rather than evidence.
Common side effects · experienced by some users
Nasal irritation
With intranasal use, some users experience mild stinging, dryness, or irritation in the nasal passages.
Management: Alternate nostrils between doses. Use saline spray if needed. Usually improves within a few days as you adjust.
Mild fatigue
Some users report feeling slightly tired in the first few days as their body adjusts to the peptide's calming effects.
Management: This typically resolves within 3-5 days. Ensure adequate sleep and hydration. If persistent, consider reducing dose.
Mild headache
Occasional headaches may occur, especially in the first week of use.
Management: Stay well-hydrated and ensure you're not dehydrated. These usually resolve as your body adapts.
Injection site redness
For those who inject, a small pink or red area at the injection site is normal.
Management: Rotate injection sites. Usually fades within 24-48 hours.
Less common
These typically resolve with continued use or dose adjustment.
Stop and seek help if
- Any signs of allergic reaction—stop immediately and seek medical help
- Persistent headaches that don't improve after the first week
- Significant nasal problems with intranasal use that don't resolve
- Worsening anxiety or mood changes (paradoxical reaction)
- Any side effect that feels serious or really concerns you
- Your cycle is complete and you're entering a rest period
Selank is approved in Russia but remains a research compound in most other countries. It is not FDA-approved in the United States. Never start, stop, or change your dosing without guidance from a qualified healthcare provider. This information is for educational purposes only—not medical advice.
With other peptides
- Safe:Semax — Excellent pairing—they complement each other beautifully. Semax focuses more on cognitive stimulation while Selank provides anxiolytic support. Often used together in Russian nootropic protocols.
- Safe:BPC-157 — Safe to combine. BPC-157 focuses on gut and tissue healing, while Selank works on brain function. No known negative interactions.
- Safe:Epithalon — Can be used in the same protocol. Different mechanisms—Epithalon works on telomeres while Selank supports cognition.
- Safe:DSIP — Both affect brain chemistry. DSIP promotes sleep while Selank can increase alertness. May have competing effects if taken together.
With medications
- Caution:Benzodiazepines (Xanax, Valium, Klonopin) — Both affect GABA systems. Potential for enhanced sedation or unpredictable interactions. Consult your doctor before combining.
- Caution:SSRIs/SNRIs (Prozac, Zoloft, Effexor) — Potential for interaction as both affect neurotransmitter systems. Inform your doctor and monitor for any mood changes.
- Caution:Sleep medications (Ambien, Lunesta) — May enhance sedation even though Selank itself isn't sedating. Use caution and inform your doctor.
- Safe:Blood pressure medications — Monitor blood pressure as Selank can have mild effects on cardiovascular parameters.
With supplements
- Safe:L-Theanine — Complementary combination. Both promote calm focus without sedation. Can enhance overall anxiolytic effects.
- Safe:Alpha-GPC — Popular nootropic stack. Alpha-GPC provides choline for acetylcholine synthesis while Selank supports broader cognitive function.
- Safe:Ashwagandha — Both have adaptogenic and anxiolytic properties. May have additive calming effects—start with lower doses of each.
- Safe:Caffeine — Selank may help smooth out caffeine jitters. Generally fine to combine, but monitor your individual response.
Effectiveness
How do I know it's working?
Limited human trials · first signs days 1-3
Evidence level
Limited human trials
Regulatory status
Research compound
Onset of effects
Rapid
(hours to days)
How it works
Imagine your brain has a 'calm down' system that uses a chemical called GABA.
When GABA activates its receptors, you feel less anxious. Selank acts like a gentle helper for this system—it makes your GABA receptors work better without directly flooding them with chemicals [1]. This is why you feel calmer but stay mentally sharp.
Plus, Selank comes from tuftsin, a natural peptide your immune system already makes, so it also helps regulate inflammation and immune function [4][5]. It's like upgrading your brain's natural chill mode while keeping your immune system happy.
The deeper mechanism
Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a synthetic heptapeptide derived from the endogenous immunomodulatory peptide tuftsin (Thr-Lys-Pro-Arg) with the addition of Pro-Gly-Pro to enhance metabolic stability [1][4].
Its primary anxiolytic mechanism involves positive allosteric modulation of GABA-A receptors, enhancing the receptor's sensitivity to endogenous GABA without directly binding the benzodiazepine site [1]. This results in anxiolysis without sedation, tolerance, or dependence [1].
Selank also modulates enkephalin degradation by inhibiting enkephalinases, increasing endogenous opioid peptide availability [6]. Neurotrophin effects include regulation of BDNF expression in hippocampus and prefrontal cortex, supporting synaptic plasticity and neuroprotection [2].
Immunomodulatory actions involve alteration of cytokine gene expression (IL-6, chemokines) and Th1/Th2 balance through effects on transcription factors including Bcl6 [4][5].
Despite a plasma half-life of only 2-3 minutes, pharmacodynamic effects persist for hours due to downstream signaling cascades and gene expression changes. The Gly-Pro fragment has been identified as a key pharmacophore for antiviral activity [7].
What to expect
Days 1-3
What you might notice
- Subtle calming effect within hours of first dose
- Slight reduction in background anxiety
- Possibly mild fatigue or headache as you adjust
- Nasal tingling if using intranasal route
- Effects may be subtle—Selank isn't dramatic like benzodiazepines
What's normal
- Mild side effects that resolve within 24-48 hours
- Gradual rather than dramatic changes
- Noticing you're handling stress slightly better
What's next
- Continue consistent daily dosing at the same time
- Track your mood and focus in a simple journal
- Side effects typically improve after day 3-4
Week 1-2
What you might notice
- More noticeable reduction in anxious thoughts
- Improved ability to focus on tasks
- Better stress tolerance in challenging situations
- Memory and recall may start improving
- Side effects should be minimal or resolved
What's normal
- Steady improvement in mood stability
- Feeling calmer without feeling sedated [1]
- Clearer thinking under pressure
What's next
- Assess whether your dose feels optimal
- Consider adjusting up if effects are too subtle
- Maintain consistent timing for best results
Week 3-4+
What you might notice
- Full anxiolytic and cognitive effects established
- Sustained improvements in focus and memory
- Better handling of stressful situations
- Possible immune function support (less frequent illness)
- Benefits often persist for days after stopping a cycle [3]
What's normal
- Stable benefits without needing dose increases
- Feeling mentally sharp and emotionally balanced
- No tolerance buildup or diminishing effects [1]
What's next
- Complete your 4-6 week cycle as planned
- Consider a 1-2 week break before next cycle
- Benefits typically persist during short breaks [3]
Signs it's working
Anxiety and Mood Indicators
- Fewer anxious or racing thoughts throughout the day
- Handling stressful situations with more composure
- Less tendency to catastrophize or worry
- More emotional stability and resilience
- Feeling calm but not sedated or 'checked out' [1]
Cognitive Performance
- Improved ability to focus on demanding tasks
- Better memory recall—names, facts, recent events
- Clearer thinking and mental organization
- Enhanced learning of new information
- Less mental fatigue during long work sessions
Overall Well-Being
- Improved stress resilience in daily life
- Better quality of social interactions
- More motivation and mental energy
- General sense of balanced well-being
Not seeing results? Common reasons
- Dose far below the label — the approved dose is 2 drops in each nostril three times a day (900 mcg total), and the studied range runs up to 2,700 mcg a day; many popular protocols quote a fraction of this [7][9]
- Counting drops for one nostril instead of both — the label is 2 drops in EACH nostril, so a 'two drop' dose is half of one administration [7]
- Spreading fewer than three administrations across the day, when the label and the trials both divide the daily dose into three [7]
- Stopping before the 14-day course is finished — the label sets a 14-day course, repeatable after 1-3 weeks [7]
- Blocked or running nose at the time of dosing — the label notes absorption drops when there is heavy nasal discharge, and recommends clearing the nose first [7]
- Poor quality peptide from an unreliable source — always ask for third-party testing certificates (COAs)
- Improper storage degraded the peptide — check the solution is clear before using
Key research
Clinical trials
Tested in people
No registered clinical trial of Selank was found in the public registries.
That does not mean nobody has studied it — laboratory and animal work is not registered anywhere. It means no study has been declared in advance where regulators and the public can see it, so there are no stated endpoints and no results anyone is obliged to report.
Questions
Frequently asked
How is Selank different from anti-anxiety medications like Xanax?
Selank and benzodiazepines both work on your GABA system, but in very different ways. Benzodiazepines directly activate GABA receptors, which provides strong but often excessive calming—leading to sedation, memory issues, and addiction risk. Selank just makes your existing GABA receptors more sensitive, so your brain's natural calming system works better [1]. You feel less anxious but stay sharp, and there's no addiction or tolerance buildup [1].
Will Selank make me feel sedated or foggy?
No—this is actually one of Selank's biggest advantages. Unlike traditional anti-anxiety drugs, Selank reduces anxiety while improving focus and mental clarity [1]. Many users report feeling 'calm but sharp.' It's popular among students and professionals specifically because it doesn't impair cognitive function [1].
Why is intranasal the preferred route?
The nasal passages provide a more direct route to the brain, bypassing much of the digestive system and liver metabolism. Since Selank has a very short half-life in blood (just 2-3 minutes), getting it closer to the brain faster helps maximize its effects. Plus, nasal spray is simply more convenient than injections for daily use.
Can I take Selank with my current anxiety medication?
This requires caution and medical guidance. Selank affects the same GABA system that benzodiazepines target, so combining them could have unpredictable effects [1]. If you're currently on anxiety medications, talk to your doctor before adding Selank. Never stop prescription medications without medical supervision.
How long until I notice effects?
Many users notice subtle calming effects within hours of their first dose. More significant anxiolytic and cognitive benefits typically develop over 1-2 weeks of consistent use. Unlike SSRIs that take weeks to work, Selank acts relatively quickly—but the effects are also more subtle than benzodiazepines.
Is Selank addictive?
Why do I need to cycle Selank?
Cycling (taking breaks) is generally recommended for most peptides to prevent any potential desensitization and to assess your baseline. A typical cycle is 4-6 weeks on, followed by 1-2 weeks off. Many users find that benefits persist during short breaks, and they can maintain effectiveness long-term with this approach [3].
Is Selank FDA approved?
No, Selank is not FDA approved in the United States. However, it has been approved for clinical use in Russia since 2009 for treating anxiety disorders and neurasthenia. Outside of Russia, it remains classified as a research compound.
Further reading
History & related research
History · since 1990
Russia's first psychotropic peptide drug designed to calm anxiety and sharpen the mind without sedation.
N-Acetyl Selank is a synthetic heptapeptide (seven amino acids) derived from the natural human fragment tuftsin. Developed in Russia in the 1990s, it works on multiple brain systems to reduce anxiety, improve memory, and modulate immunity.
Read the full history of SelankReady for the protocol?
Every dosing tier, administration route, timing note, and dose-adjustment rule for Selank, on one page.