Selank Calculator

What Is Selank?

Selank is a synthetic heptapeptide (7 amino acids) developed at the Institute of Molecular Genetics of the Russian Academy of Sciences in the 1990s. It is a synthetic analog of the naturally occurring immunomodulatory tetrapeptide tuftsin (Thr-Lys-Pro-Arg), extended with a Pro-Gly-Pro sequence derived from neuropeptide research. The full sequence is Thr-Lys-Pro-Arg-Pro-Gly-Pro.

Selank was developed in Russia as an anxiolytic and nootropic compound and is approved in Russia and some CIS countries as a pharmaceutical drug (brand name Selank nasal spray, manufactured by Peptogen) for the treatment of generalized anxiety disorder, neurasthenia, and cognitive impairment. In Western countries it is used exclusively as a research peptide. It differs from benzodiazepines and other classical anxiolytics in that it produces anxiolytic effects without sedation, dependence, or significant tolerance development — properties that have driven intense research interest.

The peptide is notable for its rapid onset of action when administered intranasally, crossing the blood-brain barrier within minutes. Its half-life via the intranasal route is very short — measured in minutes rather than hours — which requires either multiple daily intranasal administrations or subcutaneous injection to extend duration of effect. Subcutaneous injection extends the effective window to several hours.

Mechanisms of Action

Selank's pharmacology is multifaceted and incompletely understood. Key characterized mechanisms include:

• GABAergic modulation: Selank enhances the efficacy of GABA-A receptor signaling, the primary inhibitory neurotransmitter system in the brain. Unlike benzodiazepines (which bind the benzodiazepine site of GABA-A receptors with high affinity and cause receptor downregulation), Selank appears to exert a more subtle modulatory effect that preserves receptor sensitivity. This explains its anxiolytic activity without the sedation or tolerance characteristic of benzodiazepines.
• BDNF upregulation: Selank significantly increases expression of brain-derived neurotrophic factor (BDNF) in several brain regions including the hippocampus and prefrontal cortex. BDNF supports neuronal survival, synaptic plasticity, and long-term potentiation — the cellular basis of learning and memory. This is central to Selank's nootropic properties: it is not merely anxiolytic but also promotes neuroplasticity.
• Enkephalin system modulation: Selank inhibits enkephalinase — the enzyme responsible for degrading met-enkephalin and leu-enkephalin (endogenous opioid peptides with mood-regulating and stress-dampening functions). By extending enkephalin half-life in the synapse, Selank amplifies endogenous anti-stress signaling without acting as an exogenous opioid.
• Immunomodulation via tuftsin: As a tuftsin analog, Selank retains the immunomodulatory properties of its parent molecule. Tuftsin stimulates macrophage and natural killer cell activity, upregulates interleukin-6 and interferon-gamma, and promotes phagocytosis. Selank has demonstrated antiviral activity in some preclinical models, consistent with this immune-enhancing profile.
• Serotonin metabolism: Research from Russian investigators found that Selank modulates expression of genes involved in serotonin transport and metabolism, contributing to its mood-stabilizing effects and making it potentially relevant for anxiety-depression comorbidity.
• HIF pathway modulation: More recent work has identified effects on hypoxia-inducible factor (HIF) signaling and stress-response gene expression, suggesting potential neuroprotective applications under conditions of oxidative or metabolic stress.

Dosage and Dosing Protocol

Selank dosing varies significantly by administration route. The intranasal route is the most common given its rapid onset and non-invasive nature; subcutaneous injection is used when longer duration of action is desired. Use the Selank Calculator to compute draw volumes for any dose and concentration.

Typical Dosing Range

• Conservative starting dose: 0.15–0.2 mg per administration
• Standard research dose: 0.25 mg per administration
• Higher range: 0.4–0.5 mg per administration

Intranasal Administration

Intranasal Selank provides rapid CNS entry via the olfactory and trigeminal nerve pathways. Due to the very short half-life (~minutes), intranasal dosing is typically repeated 2–3 times daily for sustained effect:

• Morning dose upon waking: 0.25 mg (1–2 drops or sprays into each nostril, alternating or combined)
• Midday dose (optional, for cognitive or anxiety support): 0.25 mg
• Evening dose (for sleep or stress management): 0.25 mg

Total daily dose for intranasal use typically ranges from 0.25 mg to 0.75 mg. A 5 mg vial reconstituted with 2 mL BAC water yields 2.5 mg/mL; each 0.1 mL drop from a nasal dropper delivers approximately 0.25 mg.

Subcutaneous Administration

Subcutaneous injection extends the active window to 4–6 hours per dose. A typical subcutaneous protocol:

• Dose: 0.25 mg once or twice daily subcutaneous
• Inject into the abdomen or lateral thigh using a 29–31 gauge insulin syringe
• At 2.5 mg/mL concentration, 0.25 mg = 0.10 mL (100 µL)

Cycle Length

Most Selank protocols run 4–8 weeks continuously. Unlike benzodiazepines, Selank does not produce physical dependence, and abrupt discontinuation does not cause withdrawal. However, cycling off for 2–4 weeks after each protocol is considered good practice to preserve receptor sensitivity. View Selank at BergdorfBio for purchasing options.

Reconstitution

Selank arrives as lyophilized powder in 2 mg or 5 mg vials. It must be reconstituted with bacteriostatic water before use. For nasal administration, some researchers use sterile saline rather than BAC water to reduce mucosal irritation, though BAC water is more commonly available and effective.

1. Allow the vial to warm to room temperature (15–20 minutes out of refrigerator or freezer).
2. Wipe both vial stoppers with a 70% isopropyl alcohol swab and allow to dry.
3. Draw 2 mL of BAC water into a sterile syringe. This gives:
   • For a 2 mg vial: 1 mg/mL concentration
   • For a 5 mg vial: 2.5 mg/mL concentration
4. Insert the needle against the inner glass wall of the peptide vial. Depress the plunger slowly, allowing water to trickle down the wall — do not jet directly onto the powder.
5. Gently swirl until fully dissolved. Solution should be clear and colorless. Do not shake.
6. Label the vial with the reconstitution date and concentration.

For intranasal use, the reconstituted solution can be transferred to a clean nasal dropper or nasal spray bottle using a syringe and blunt cannula. Store the nasal applicator refrigerated when not in use.

Storage and Shelf Life

• Lyophilized powder (unreconstituted): Store at −20°C for long-term stability (up to 24 months). Refrigerator storage (4°C) is acceptable for up to 3 months. Protect from light and moisture. Keep sealed until reconstitution.
• Reconstituted solution: Refrigerate at 2–8°C. Use within 28–30 days. Keep away from light. Do not freeze the reconstituted solution.
• Nasal applicator: If using a nasal dropper or spray bottle, store refrigerated and use within 14–21 days to minimize microbial risk from repeated use.
• Transport: Short-term room-temperature transport is acceptable for 1–2 days. For longer transport, use an insulated bag with an ice pack.

Side Effects and Safety

Selank has a favorable safety profile based on decades of Russian clinical research and preclinical data. It is not associated with the abuse potential, sedation, or dependence seen with classical anxiolytics.

Common Observations

• Mild nasal irritation: With intranasal use, some users experience mild stinging or mucosal irritation. Using diluted concentrations (0.5–1 mg/mL) or buffered saline-based solutions can reduce this.
• Transient drowsiness: Occasionally reported, particularly at higher doses or during the first week of use. This typically resolves as the body adapts and is far milder than benzodiazepine sedation.
• Mood elevation: A consistently reported positive effect — sometimes described as a mild euphoria or emotional "smoothing" that researchers distinguish from the blunted affect seen with SSRIs.
• Increased appetite: Some users report a modest increase in appetite, consistent with reduced cortisol-driven suppression of feeding signals.

Precautions

• No documented interactions with SSRIs, SNRIs, or other psychiatric medications, but the combination has not been formally studied. Use with caution and under professional guidance if combining with psychoactive medications.
• Selank should not replace medical treatment for clinical anxiety disorders. It is a research compound and not an approved treatment in most jurisdictions.
• Avoid use during pregnancy and breastfeeding due to insufficient safety data.

In Russian Phase I–II clinical trials, Selank showed no significant adverse effects at therapeutic doses. No evidence of mutagenicity, carcinogenicity, or toxicity has been found in preclinical studies.

Combinations and Stacks

Selank + Semax (Cognitive-Anxiolytic Stack)

The most widely used Russian nootropic stack combines Selank with Semax — a synthetic ACTH(4-7) analog with potent nootropic and neuroprotective properties. Selank provides anxiolytic grounding and BDNF support while Semax drives dopaminergic tone, focus, and serotonin metabolism. The combination is used in Russia clinically for cognitive decline, ADHD-adjacent presentations, and post-stroke rehabilitation.

• Selank: 0.25 mg intranasal, 2x daily
• Semax: 0.25–0.5 mg intranasal, 1–2x daily (morning, midday)
• Cycle: 4–6 weeks

Selank + MOTS-c

For researchers interested in combining cognitive-stress optimization with metabolic enhancement, MOTS-c and Selank address entirely distinct biological targets. MOTS-c handles mitochondrial and metabolic signaling; Selank handles GABAergic tone, BDNF expression, and immune modulation. There is no known pharmacological conflict, and the two can be used in the same protocol with separate administration schedules.

Selank + SS-31

For aging-related protocols targeting both neuroprotection and mitochondrial function, SS-31 can be layered with Selank. SS-31 addresses mitochondrial ROS and energy production; Selank addresses anxiety, cognitive performance, and neuroplasticity. Both have neuroprotective properties through different mechanisms, making the combination theoretically synergistic for brain health goals.

Frequently Asked Questions

How does Selank differ from benzodiazepines?

Benzodiazepines bind directly to GABA-A receptors as positive allosteric modulators with high affinity, producing sedation, muscle relaxation, and — with repeated use — physical dependence and tolerance. Selank modulates GABAergic tone indirectly and through multiple pathways, producing anxiolysis without sedation or dependence. Russian clinical studies found no withdrawal syndrome upon discontinuation of Selank, and no evidence of tolerance development over the studied timeframes.

Is Selank approved for human use?

In Russia and certain CIS countries, Selank is approved as a pharmaceutical nasal spray for anxiety and cognitive impairment. In the EU, US, UK, and most Western jurisdictions it is not approved for therapeutic use and is available only as a research peptide. Researchers should always verify the regulatory status in their jurisdiction.

Does Selank affect cognitive performance?

Yes, and this is one of its most researched properties. Multiple studies have demonstrated improvements in memory consolidation, attention, and learning under Selank administration. The mechanism is closely tied to its BDNF-upregulating effects and its ability to reduce cortisol-driven cognitive interference — high anxiety impairs working memory and consolidation, and Selank's anxiolytic properties secondarily improve cognitive performance.

Can Selank help with sleep?

Some researchers report improved sleep quality, particularly reduced sleep-onset anxiety and fewer nighttime awakenings. The evening dose timing (30–60 minutes before bed) is a common protocol variation for sleep-focused applications. Unlike benzodiazepines, Selank does not suppress REM sleep, which is an important distinction for users prioritizing sleep architecture over simply inducing unconsciousness.

How does intranasal compare to subcutaneous administration?

Intranasal delivery provides near-immediate CNS access via the olfactory nerve but has a very short duration — 20–40 minutes of peak effect. Subcutaneous injection slows systemic absorption and extends the active window to 3–6 hours per dose, making it more suitable for sustained cognitive or anxiolytic support throughout the day. Many researchers use intranasal for acute situational dosing (exam, presentation, high-stress event) and subcutaneous for daily protocol use.

Does Selank cause emotional blunting?

No. This is a commonly noted distinction from SSRIs and anxiolytics like buspirone. Selank researchers consistently report that it reduces anxiety and stress reactivity without dampening emotional range or flattening affect. Positive emotions remain fully accessible, which is consistent with its mechanism of action — modulating stress responses rather than broadly suppressing neurotransmission.

What is the shelf life after reconstitution?

Reconstituted Selank stored at 2–8°C is stable for approximately 28–30 days. For nasal use, a practical recommendation is to reconstitute smaller volumes (e.g., 1 mg vials into 1 mL) that can be used within 2 weeks, reducing the total time the solution is open and in a nasal applicator — which carries higher microbial exposure risk than a sealed vial.

Can Selank be used alongside nootropic supplements?

Yes. Selank is commonly combined with racetam-class nootropics (aniracetam, piracetam), choline supplements (alpha-GPC, CDP-choline), and adaptogens (ashwagandha, rhodiola) without reported adverse interactions. For GABAergic supplements specifically (phenibut, L-theanine), caution is warranted to avoid excessive GABAergic tone, though Selank's modulatory — rather than direct agonist — mechanism makes significant negative interaction unlikely at standard doses.

Medical Disclaimer: The information on this page is provided for educational and research purposes only. Selank is not an approved drug or medical treatment in most jurisdictions. It is sold strictly for research use. Nothing on this page constitutes medical advice, diagnosis, or a recommendation to use any specific compound. Always consult a qualified healthcare professional before beginning any peptide protocol. BergdorfBio assumes no liability for the use or misuse of the information presented here.