Peptide guide

Selank

A synthetic anxiolytic peptide built from tuftsin, studied for anxiety, stress, and focus — and approved in Russia, though not by the FDA.

Selank is a synthetic peptide developed in Russia as an anti-anxiety drug, built by extending the natural immune peptide tuftsin so it survives long enough to act on the brain. Unlike most gray-market peptides, it has been through human trials and is prescription-approved in Russia for generalized anxiety disorder. Outside Russia it isn't FDA-approved and is sold as a research chemical, most often as lyophilized powder you reconstitute and inject subcutaneously. People use it for anxiety, stress, and focus without the sedation or dependence of benzodiazepines, so the practical questions are how it's actually prepared and how to tell a real source from a scam.

By the Zapify Research team

Reviewed against 9 clinical & research sources · Updated June 2026 · Educational use only

Type: 7-aa peptideTuftsin analog
Route: Subcutaneous
Typical dose: 250–500 mcg/daytrials ran higher
Cycle: ~2–3 wk coursenot continuous
Storage: Mixed: 2–4 wksSealed: months
Status: Not FDA-approvedapproved in Russia

What is Selank?

A synthetic anti-anxiety peptide built by extending the natural immune peptide tuftsin so it survives long enough to reach the brain — prescription-approved in Russia, not FDA-approved.

Selank is a synthetic peptide, a short chain of amino acids, the same building blocks that make up every protein in your body. The version people buy is seven amino acids long, with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. It was developed in the early 1990s at the Institute of Molecular Genetics of the Russian Academy of Sciences, working with the Zakusov Institute of Pharmacology, as an anti-anxiety drug.

It's built from tuftsin, a natural four-amino-acid immune peptide your body makes when it cleaves an antibody. Tuftsin on its own is useless as a drug because enzymes in the blood chew it apart in seconds. Russian researchers tacked on a three-amino-acid tail, Pro-Gly-Pro, that shields it from those enzymes. That small change is the whole point of the molecule: it keeps tuftsin's calming and immune effects around long enough, minutes instead of seconds, to actually reach the brain.

In the research-chemical market it arrives as lyophilized powder you reconstitute and inject subcutaneously, the same way the rest of this class is handled. It carries no sedation, no benzodiazepine-style high, and no reported withdrawal, which is the reason it drew interest as an anxiety treatment in the first place.

Selank isn't FDA-approved. It is a registered prescription drug in Russia for generalized anxiety disorder, approved by the Russian Ministry of Health in 2009 and sold there as a 0.15% nasal spray. But it has never been through the FDA, EMA, or any other Western regulator, and outside Russia and a few neighboring countries it's sold as a research chemical, not a medicine. The human evidence behind it is real but small, and almost all of it is Russian.

What is it studied for?

Actually tested in people: small Russian trials in anxiety and neurasthenia patients, including one against a benzodiazepine, but dozens of subjects, institute-run, and rarely replicated.

Selank stands apart from most peptides in this market on one count: it has actually been tested in people. Russian groups ran controlled clinical trials in patients with generalized anxiety disorder and neurasthenia, which is how it earned its prescription approval there. The catch is scale and independence. These were small trials, dozens of patients rather than the thousands a Western approval demands, run by the institutes tied to the drug, and rarely replicated outside Russia.

Human evidence, by origin

Several, smallRussian clinical trials

NoneIndependent Western trials

The trials that exist are genuinely encouraging within their limits. One comparative study put Selank head to head with medazepam, a benzodiazepine, in 62 anxiety and neurasthenia patients and found a similar anxiolytic effect with added anti-fatigue benefit and no sedation. Another reported that a subset of patients responded within the first few days of a two-week course, while the rest improved more gradually.

AnxietyThe core use and the basis of its Russian approval: generalized anxiety disorder, treated without the sedation or dependence of benzodiazepines.

Stress & moodStudied for neurasthenia and stress-related fatigue, where the anti-anxiety and anti-fatigue effects were reported together.

Focus & cognitionReported nootropic effects on attention and memory, though weaker here than its Russian sibling Semax, which is aimed more squarely at cognition.

How it works is better understood than for most peptides, without being fully settled. The leading account is that Selank acts on the GABA system, the brain's main brake, behaving like a positive modulator the way benzodiazepines do but far more gently. It also nudges serotonin and dopamine signaling, slows the breakdown of the body's own calming enkephalins, and raises BDNF, a growth factor tied to learning. Which of these does the heavy lifting in a person, at the doses people actually use, is still open.

Why people use it

People want anxiety, stress, and focus relief without benzodiazepine sedation or dependence, but the supporting trials are small, Russian, and unconfirmed by FDA-grade study.

Most people who try Selank land in one of a few situations. These are the reasons they reach for it, not proof it delivers outside the trial setting:

Day-to-day anxiety or a stress spike, wanting something that takes the edge off without the fog or grogginess of a benzodiazepine.
A specific aversion to dependence, since the appeal over traditional anti-anxiety drugs is the reported lack of tolerance and withdrawal.
Wanting steadier focus under pressure, drawing on the attention and memory effects reported alongside the anxiolytic ones.
Curiosity about a calmer baseline mood, where the serotonin and BDNF effects get cited.

The honesty here cuts the other way from most peptides. Selank has human trials and a national approval behind it, which is more than almost anything else sold in this market can claim. But those trials are small, Russian, and largely run by the drug's own institutes, and no FDA-grade study has confirmed them. It's a real candidate worth being curious about. It still isn't a settled treatment, and it won't replace the things with deep evidence for anxiety: therapy, sleep, exercise, and a doctor who can rule out what else might be driving it.

How to reconstitute Selank

Mix with bacteriostatic water, swirl don't shake; a 10 mg vial in 2 mL gives 5 mg/mL (5,000 mcg/mL), so 5 units on a U-100 syringe is 250 mcg.

Research-chemical Selank arrives as a small puck of dry powder you reconstitute yourself, then draw into an insulin syringe for a subcutaneous shot. (Russia's approved product is a ready-made 0.15% nasal spray you don't mix at all, but that's the foreign prescription form, not what ships here.) The mixing process below is what gets the powder ready to draw.

Step 1Start with powderWipe the rubber stopper with an alcohol swab.

Step 2Add bac. waterRun it slowly down the inside wall — never shake.

Step 3Draw your doseThe calculator gives the exact units to draw to.

Wipe the rubber stopper with an alcohol swab first, every time.
Use bacteriostatic water, not plain sterile water and not saline. The trace of benzyl alcohol in it holds back bacteria, which matters because you'll be drawing from the same vial for the length of a course.
Add the water slowly, running it down the inside glass wall. Don't blast it straight onto the powder.
Don't shake it. Swirl gently and let it dissolve on its own. Shaking foams the solution and can damage the peptide.

A common setup is a 10 mg vial mixed with 2 mL of bacteriostatic water, which gives 5 mg/mL, or 5,000 mcg per mL. For subcutaneous use on a U-100 insulin syringe, 5 units is then 250 mcg. The water doesn't change how much peptide is in the vial; it only sets the concentration, which decides how much you draw. More water means a more dilute mix and a bigger draw for the same dose.

Calculate your exact Selank reconstitution →

Dose & units

No FDA-approved dose; subcutaneous write-ups cluster around 250–500 mcg daily, run as a 14–21 day course rather than a daily-forever supplement.

There is no FDA-approved dose for Selank. The Russian approval comes with a clinical dosing schedule for its 0.15% nasal product, but that's a foreign label, not a standard your pharmacy can fill or your doctor here can lean on. Everything below is what trials and clinics report. Decide what goes into your body with a licensed provider, not with this page.

Typical range

Reported daily totals for subcutaneous use cluster around 250–500 mcg in research-chemical write-ups, though Russian intranasal trial protocols ran considerably higher, from several hundred micrograms up to roughly 1.5–2.7 mg a day split across two or three doses. (A microgram, or mcg, is a thousandth of a milligram.) Injected and nasal doses are often quoted in the same microgram range, which is unusual; absorption differs between the routes, so they aren't truly interchangeable.

Titration

Most write-ups start near the low end, around 250–300 mcg a day for the first week or two, then adjust. Selank clears the body in minutes, so the effect is felt soon after a dose rather than building over weeks, which makes a low, attentive start the sensible way to gauge your own response.

Cycling

This is a short course, not a daily-forever supplement. The Russian trials ran roughly 14 to 21 days, and most reported protocols mirror that: a two-to-three-week course, then a break before repeating if needed.

On2–3 weeks

Off1–2 weeks

For the exact mark to draw to on your insulin syringe, don't eyeball it. The calculator turns your vial size, water, and dose into the precise number.

Get your exact units →

Storage

Sealed powder lasts months at room temperature; once mixed, refrigerate at 2–8 °C and use within about 2–4 weeks — a sterility limit, not strength.

Sealed & drySealed dry powder stays stable for months at room temperature and shrugs off shipping heat.

ReconstitutedRefrigerate at 2–8 °C in the main compartment, use within about 2–4 weeks, don't freeze, keep out of light, and toss if cloudy or discolored.

You'll see longer windows quoted for peptide vials. Those figures are beyond-use dates for a sealed, unmixed vial that a compounding pharmacy has stability-tested, and they stop applying the moment you add water. A mixed vial runs on the shorter clock instead, because that's how long the preservative in bacteriostatic water reliably keeps the solution clean once you're drawing from it.

That limit is about sterility, not strength — the peptide itself often stays good well beyond it. Reconstitute with plain sterile water instead of bacteriostatic and you drop to a day or two, since there's no preservative holding bacteria back.

Don't freeze a reconstituted vial, keep it out of direct light, write the mix date on the label, and throw it out if the solution ever turns cloudy or discolored, whatever the date says.

Side effects & safety

Trials found no sedation, tolerance, or withdrawal and mostly mild injection-site or nasal irritation, but the record is small and short, so interaction risk with psychiatric drugs is unmapped.

Selank's tolerability is one of its better-documented traits, because the human trials watched for it directly. The reported side effects are generally mild, and notably the trials found no sedation, no tolerance, and no withdrawal, the problems that dog benzodiazepines. Still, that record is built on small, short Russian studies, not large long-term safety data, so hold it loosely.

Most common with subcutaneous injection: mild redness or irritation at the injection site.
From nasal dosing, where it's used that way: mild, short-lived nasal irritation, a stuffy or sore-feeling nose, or sinus discomfort.
Less often, and not firmly tied to the drug: a mild headache, brief fatigue, or light dizziness.

Talk to a doctor before you start, especially if you're already taking anything for anxiety, mood, or sleep. Selank acts on the GABA, serotonin, and dopamine systems, the same targets as many prescription psychiatric drugs, and how it interacts with them in a person hasn't been mapped. The same goes if you're pregnant, breastfeeding, or managing a serious health condition. Anxiety can also be a symptom of something a doctor should look at directly, which a peptide won't address.

On anti-doping, the picture is unsettled rather than clear. Selank isn't named on the WADA Prohibited List. But the list's S0 category sweeps in any substance not approved by a government regulator for human use, and how that reads for a drug approved only in Russia hasn't been cleanly resolved for Selank in published anti-doping rulings. A competing athlete should treat it as a live risk, not a safe bet, and check with their anti-doping authority before using it.

And the biggest risk here isn't really the molecule, which has a calmer safety record than most. It's whether what's in the vial is actually Selank, at the strength on the label. That comes down to where you buy it.

How to vet a source

Selank is rarely tested by buyers and a seven-amino-acid sequence is easy to get short, so insist on a batch-specific, third-party COA whose lot number matches your vial.

This is an unregulated market, and a real share of independently tested vials come back underdosed, impure, or not even the compound on the label. Selank is a particular target because it's obscure enough that buyers rarely test it, and a seven-amino-acid sequence is easy to get wrong or short, none of which you can see in the powder. Where you buy matters more than almost anything else here. The one document that separates a real seller from a gamble is a certificate of analysis: a third-party lab's report on what's actually in the vial.

A real COA shows

An identity test (usually mass spectrometry) confirming the peptide is what the label says.
A purity figure from HPLC, typically 98% or higher.
A lot or batch number that matches the number printed on your vial.
A named, independent accredited lab and a recent test date.

Walk away if

There’s no COA, or it’s a generic image with no lot number.
The “certificate” comes from the seller instead of a third-party lab.
The lot number doesn’t match your vial, or there isn’t one at all.
It’s a flat image you can’t trace back to the lab that issued it.

That's the standard worth holding any seller to, ours included. Ask for the batch-specific COA before you buy, match the lot number to your vial, and don't accept a screenshot in place of a traceable report.

See the Zapify compound catalog →

Common questions about Selank

Is Selank approved or proven to work in people?

Partly, and only in one place. Selank is an approved prescription drug in Russia for generalized anxiety disorder, backed by Russian human trials, which is more than almost any peptide in this market can say. But it's not FDA-approved or approved by any Western regulator, the trials behind it were small and largely run by the institutes tied to the drug, and no independent Western study has confirmed them. Treat it as promising but unproven by FDA standards.

Selank or Semax — what's the difference?

They're sibling peptides from the same Russian research lineage, often confused. Selank is built from tuftsin and aimed at anxiety; its anxiolytic effect is the stronger one. Semax is derived from ACTH and aimed at cognition and focus; its nootropic effect is the stronger one. People sometimes use them together for that reason. Neither is FDA-approved, both are handled as reconstituted research chemicals in this market, and the same sourcing rules apply to both.

Subcutaneous injection or nasal spray — how does the route work?

In the research-chemical market Selank is reconstituted and injected subcutaneously, the same as the rest of this class, and that's the path this guide and the calculator are built around. A separate fact for context: Russia's approved product is a 0.15% intranasal spray, and its clinical trials used that nasal form, so the nasal route has a formal trial record where the subcutaneous one doesn't. Absorption differs between the two, so doses don't carry over cleanly. For what ships as powder here, the subcutaneous draw is the route to plan for.

Is Selank addictive like Xanax or other anti-anxiety drugs?

The reported answer is no, and it's the main reason the drug drew interest. The Russian trials found no sedation, no tolerance building over a course, and no withdrawal on stopping, which is the opposite of the benzodiazepine pattern. That said, this rests on short trials measured in weeks, not years of long-term human data, so it isn't a guarantee, just a consistent and encouraging signal.

Why bacteriostatic water and not saline or sterile water?

Because you'll be drawing from the same vial across a multi-week course. Bacteriostatic water carries a trace of benzyl alcohol that holds back bacteria between draws; plain sterile water and saline have no preservative. On a multi-dose peptide vial, the professional sources all point the same way: bacteriostatic. Mix with plain sterile water and the vial's safe window drops to a day or two.

References

This page is for research and educational purposes only. It is not medical advice or a recommendation to use any compound. The dose ranges shown are reported by clinics and research literature, not validated medical standards, and Selank is not FDA-approved. Talk to a licensed medical provider about anything you put in your body.