Selank: the Russian anxiety peptide, benefits, side effects and US status

Selank is an anxiety peptide with a real drug registration in Russia, where it is an over-the-counter nasal drop, and no standing at all in the United States. It is not FDA-approved, it is not part of any approved drug, and as of November 2, 2026 it has no lawful compounding route. That Russian registration is the main reason it looks more established than most of the names in our peptide index. The evidence behind it is much thinner than the registration suggests.

What is selank?

Selank is seven amino acids: threonine, lysine, proline, arginine, proline, glycine, proline (Thr-Lys-Pro-Arg-Pro-Gly-Pro). The first four are tuftsin, a short fragment of an antibody protein that acts on immune cells, and the last three (Pro-Gly-Pro) extend it. Most of the published studies list researchers from the Russian Academy of Sciences’ Institute of Molecular Genetics and Mental Health Research Center among their authors.

What does selank do?

Selank is reported to reduce anxiety, but how it does this is not settled. Three explanations appear in the literature, all from the group that developed it or its close collaborators:

• Enkephalins. A 2001 study found selank blocked enzymes in blood that break down enkephalins, the body’s own calming opioid-like peptides, and proposed that as its anti-anxiety mechanism.
• GABA. A 2018 lab study on brain cell membranes found selank changed how GABA, the brain’s main calming signal, binds to its receptors. Benzodiazepines act on that same system. A 2021 review in the Journal of Clinical Pharmacology grouped selank with phenibut as drugs with “GABAergic mechanisms.”
• Immune signals. Other papers describe effects on cytokines, the immune system’s signaling molecules.

None of this has been independently confirmed in people outside Russia.

What is selank used for?

In Russia, selank is registered for anxiety and stress. Russia’s medicines reference (RLS) lists the product as follows:

That is the dosing the Russian label states for its nasal product. It is not a US dose, and the label says nothing about injecting selank, which is how many online products are sold. PeptideSorted could not confirm the original registration date from a primary source, so this page does not give one.

Does selank work? What the human studies show

Selank may ease anxiety, but the studies cannot show how well. These are the trials we could find:

Three things limit what these studies can show. They are small and short, around two weeks of treatment. They compare selank with older Russian benzodiazepines, not with placebo or with current first-line treatments. And they come largely from the research group and institute that developed selank, published in Russian-language journals, so their methods are hard to check. There is no published trial of selank by injection, which is the form sold online in the United States.

In the language this site uses for evidence, selank sits on the small-human-studies rung. Without a placebo group, a shared improvement on selank and on a benzodiazepine could partly reflect expectation or time.

Selank benefits: the claims against the evidence

The benefits listed on selank pages online go well beyond anxiety. Most trace back to the Russian label or to rodent work.

How long does selank take to work?

No study has measured this cleanly. The Russian trials judged results over about two weeks, and one reported that the anxiety effect lasted about a week after the last dose. The Russian product information says selank reaches the blood within 30 seconds of being dropped into the nose, and that plasma levels fall over 5 to 5.5 minutes. So the peptide itself is gone quickly, and any lasting effect would have to come from something downstream that no one has mapped in people.

Selank side effects

Selank’s side effects are poorly documented, which is different from saying it has none. The Russian label lists two: allergic reactions, including delayed ones, and an unpleasant taste when the drops reach the throat. Both are marked “frequency unknown.” The label also warns that the methylparaben preservative in the drops can cause allergic reactions. All of this describes the Russian product. It tells you little about a vial sold online.

The Russian label also says selank causes no drug dependence and does not affect driving. Those statements have not been tested in any independent study we could find. The 2021 US review was blunt, calling selank and phenibut “poorly studied Russian drugs” and arguing that agents with GABA activity should be evaluated for abuse potential “before public access ensues.”

FDA’s own assessment, on its page of compounding substances with safety concerns, is that injected selank acetate “may pose risk for immunogenicity” (an immune reaction) “due to the potential for aggregation and peptide-related impurities,” and that FDA “lacks important information regarding any safety issues raised by selank acetate administered to humans.”

Selank dosage: is there a human dose?

No human dose has been established for the United States. The only dosing with any official standing is the Russian label’s schedule for its own 0.15% nasal drops, shown above, and that says nothing about what is safe for you. No study has tested a dose by injection, so any injected dose you see online is a guess. Because selank products are unregulated here, the strength in the bottle is unverified too.

Selank vs semax

Selank and semax are related Russian peptides, often sold as a pair, but they differ in origin, intended use and US standing.

The anxiety line is the one to notice. Russia’s own label treats anxiety with one and lists it as a reason to avoid the other, so “selank and semax” blends cannot be assumed to fit the same person. FDA’s semax review found one website offering a 50:50 blend. No study we found has tested one.

Selank’s legal status in the US

As of November 2, 2026, selank has no lawful US route: no approval, no bulks-list entry and no enforcement policy covering it.

Being dropped from category 2 because a nominator withdrew does not make a substance compoundable. It removes it from the process altogether, so selank remains an unapproved new drug with no lawful route to a US patient. Semax took a different path: FDA’s advisory committee reviewed it in July 2026 and HHS later listed it, with limits. None of that carries over to selank, however often the two are sold together.

A 2021 review noted selank being sold to US consumers as a dietary supplement. That label does not change its status either.

What research use only means

Online sellers label selank vials “for research use only.” Under 21 CFR 312.160, that label allows shipment only for tests in laboratory animals or test tubes, marked “Not for use in humans.” It does not make spraying or injecting the product legal for a person. A Belgian medicines lab that analyses seized products has found selank and semax in suspicious preparations and noted they are freely sold online as powder for injection and as nasal sprays. A product bought this way has no verified identity, strength or sterility, and a seller’s certificate of analysis does not change that; the COA guide explains why.

Is selank banned in sport?

Selank is not named on the 2026 WADA Prohibited List. WADA’s class S0 bans, at all times, any pharmacological substance not covered elsewhere on the List and “with no current approval by any governmental regulatory health authority for human therapeutic use.” Selank’s Russian registration means it is not obvious that S0 applies. An athlete subject to testing should get a ruling from their national anti-doping organization rather than assume either way.

What to watch for

• No US safety review. FDA has never reviewed a selank application, and the published safety data are short Russian trials.
• Injection is unstudied. The registered product is a nasal drop. FDA flagged immune-reaction risk for injected selank.
• Combining with sedatives. One Russian trial gave selank with a benzodiazepine, and a lab study found selank changed how diazepam and olanzapine affected GABA binding. No study has looked at interactions with other anti-anxiety or sleep medicines used in the US.
• Pregnancy and breastfeeding. The Russian label lists both as contraindications, because no clinical studies were done. It also excludes anyone under 18.
• Allergy. Stop and get care for swelling, hives or trouble breathing after any product.

PeptideSorted does not link to sellers of selank or any other unapproved peptide. The are peptides safe guide covers what testing of research-market peptides has found.

What to do about anxiety instead

Anxiety has treatments with far stronger evidence, and a prescriber can help match one to you. NIMH says generalized anxiety disorder is usually treated with therapy, medication or both. Cognitive behavioral therapy (CBT) is a research-supported psychotherapy commonly used for it. Medicines include SSRI and SNRI antidepressants, buspirone and benzodiazepines.

Questions worth asking at that visit:

• Could a health condition or another medicine be driving this?
• Would CBT, a medicine or both suit me better?
• How long should a treatment take to show an effect, and how will we measure it?

If you have already tried selank or anything like it, tell your clinician and bring the label.

The FDA status tracker follows selank’s position alongside every other peptide.