How to take selank peptide: dosing, route, and timing

Last updated 2026-07-26

What is selank and how is it usually taken?

Selank is a synthetic heptapeptide developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, built as an analog of tuftsin, a naturally occurring immunomodulatory peptide fragment ^[1]. In Russia it's registered and sold as a prescription nasal spray under the brand Selank, used mainly for anxiety and stress-related conditions. Outside Russia, selank has no FDA approval for any use. It shows up in the US and elsewhere through research-chemical vendors and compounding channels, sold as a peptide for research purposes, not as an approved drug. That distinction matters for how you think about dosing: every number below comes from Russian-language pharmacology and clinical papers, or from harm-reduction norms in the peptide research community, not from a US-reviewed drug label. The standard route in essentially all the literature is intranasal. Selank is a peptide, so it's broken down by digestive enzymes if swallowed, which is why it isn't taken as a pill. Some people in research and biohacking circles use subcutaneous injection instead, which the selank semax injection guide covers in more detail, but the nasal route is what almost all the published dosing data is actually based on.

What is the standard selank dosage?

Russian clinical and pharmacological papers describe doses in the range of 250 to 3000 micrograms (mcg) per day, usually split into two or three intranasal administrations ^{[2] [3]}. A commonly cited protocol is roughly 100 to 200 mcg of a 0.15% solution sprayed into each nostril, two to three times daily, for a course of one to three weeks depending on the condition being studied. The amount that ends up in a spray depends entirely on the concentration of the solution. A 0.15% intranasal solution (150 mcg per spray, roughly) is the format most often referenced in Russian clinical use. Peptide vendors selling selank as a research chemical typically supply lyophilized powder in vials of 5 mg or 10 mg, which the buyer reconstitutes with bacteriostatic water, so the actual mcg-per-spray dose depends on how much water is added and what kind of nasal applicator or dropper is used. There is no dose-ranging trial in the Western literature establishing a minimum effective dose or a maximum safe dose in humans with the rigor the FDA would require for an approved anxiolytic. The 250 to 3000 mcg/day range is a real range pulled from published Russian sources, but it is wide. Where a given study lands in that range often depends on the specific patient population (for example, generalized anxiety versus adjustment disorder versus experimental stress models) ^[3]. For a fuller breakdown of specific published protocols, see selank dosage. | Use case in literature | Typical daily dose | Split | Course length |

How many times a day should you take selank?

Most published protocols split the daily dose into two or three administrations rather than one large dose. The rationale given in Russian pharmacokinetic work is that selank has a short half-life, on the order of minutes once it crosses into circulation, since peptides are degraded quickly by peptidases in blood and tissue ^[1]. Spreading the dose out is meant to keep some effect present across the day rather than one spike that fades fast. A typical pattern looks like: one dose in the morning, one around midday, and (in three-times-daily protocols) one in the afternoon. People generally avoid dosing right before bed since some report mild alerting effects, though this isn't something with controlled human data behind it, just self-report from the research and nootropics community. If you're using selank for a specific single event, like an anxiety-provoking presentation or exam, one nasal dose taken 30 to 60 minutes beforehand is the pattern most often described anecdotally. There's no clinical trial testing single-dose situational use specifically, so this is inference from the pharmacology, not a proven protocol.

How long does a course of selank last, and can you take it every day?

In the Russian clinical literature, courses generally run 10 to 14 days, sometimes up to 3 weeks, followed by a break ^{[2] [3]}. This isn't a hard rule so much as the pattern that shows up across the available published studies, most of which were designed as short trials rather than long-term maintenance treatment. There's no published data on continuous daily use for months. Nobody, honestly, has a good evidence-based answer on long-term daily dosing. People in the peptide community often cycle selank: two to four weeks on, then a week or more off, partly out of caution and partly because tolerance concerns (real or assumed) haven't been ruled out by any long-duration study. If you're going to use it repeatedly over months, that's a decision made without much of a safety net from the literature, and you should treat it that way. For a full accounting of what's known about tolerance, rebound, and side effects with repeated or extended use, selank side effects is worth reading before committing to a long cycle.

Intranasal or injection: which route is actually used in the research?

Intranasal is the route used in essentially all human clinical data on selank, including the Russian trials for anxiety and stress-related conditions ^[2]. This is also the route the approved Russian nasal spray product uses. If you're trying to map your use onto what's actually been studied in people, nasal is the route with data behind it. Subcutaneous injection is used by some in the peptide research community, largely on the assumption that it bypasses potential degradation in the nasal mucosa and improves how much peptide reaches circulation. There isn't a published human bioavailability comparison of intranasal versus subcutaneous selank that would confirm this assumption one way or the other. Animal studies on the closely related peptide semax have looked at bioavailability by route, but that doesn't automatically transfer to selank, since the two peptides, despite sharing a research lineage, are structurally different (semax is derived from ACTH, selank from tuftsin) ^[1]. If you want the injection route, sterile technique and correct reconstitution matter a lot, since you're now dealing with something that bypasses the body's normal barrier defenses. The selank semax injection page goes through the practical side of that in more detail.

How is selank different from semax, and does that change how you'd take it?

Selank and semax are often mentioned in the same breath because they come out of the same Russian research tradition (the Institute of Molecular Genetics), share a nasal delivery route, and get grouped together as "the Russian peptides" in nootropic forums. But they're different molecules with different intended effects. Selank is a tuftsin analog, studied mainly for anxiolytic and mild antidepressant effects, and it's the one more associated with calming, anti-anxiety use ^[1]. Semax is derived from a fragment of adrenocorticotropic hormone (ACTH) and is studied more for cognitive and neuroprotective effects, including in stroke rehabilitation research in Russia ^[4]. People sometimes use them together, on the theory that selank handles the anxious edge while semax handles focus, but there's no controlled trial of that combination either; it's a stacking idea from the community, not a tested protocol. Because the two are dosed differently (semax protocols in the literature often run in the microgram range per spray too, but the concentrations and typical daily totals differ) mixing up dosing instructions between them is a real and common mistake. If you're researching one, make sure the dosing you're reading is actually for that peptide. The semax vs selank and selank vs semax comparisons break down the practical differences if you're trying to decide which fits what you're after, or whether either does.

How good is the evidence behind selank's anxiolytic effects, really?

This is the single most important thing to understand before you decide on a dose: selank's clinical evidence base is almost entirely Russian-language, run in Russian institutions, published mostly in Russian-language journals, and it has not been replicated in Western, peer-reviewed, English-language randomized controlled trials at anything like the scale the FDA would require for an anxiolytic drug approval ^{[2] [5]}. That doesn't mean the research is worthless. Selank has gone through Russian regulatory registration as a prescription drug, which requires some level of clinical trial data under Russian pharmaceutical law, and there are multiple published studies, including some placebo-controlled trials, describing anxiolytic effects in generalized anxiety disorder and stress-related conditions ^{[2] [3]}. Animal pharmacology work on selank's mechanism (effects on brain-derived neurotrophic factor expression, serotonin and GABA systems, and monoamine oxidase activity) is also reasonably substantial and has appeared in some English-language pharmacology journals ^[6]. But Russian regulatory approval is not the same thing as FDA approval, and it doesn't carry the same evidentiary weight in terms of trial design transparency, sample sizes, or independent replication that Western regulators or journals typically demand. Nobody has run a large, preregistered, English-language randomized controlled trial of selank for anxiety that's been published in a major Western psychiatry journal. If you're used to evaluating drugs by the FDA/EMA evidence standard, selank simply doesn't have a dossier that meets that bar yet, no matter how many Russian studies exist. The honest read is: real research exists, of moderate to unclear quality by Western trial standards, on a drug that is not approved or reviewed by the FDA for any use in the US. For the fuller accounting of what those studies actually found and how they were designed, see selank.

Should you take selank on an empty stomach, or does food matter?

Since selank is taken intranasally rather than swallowed, food timing relative to a meal isn't really a factor in the way it would be for an oral drug. Nasal absorption happens through the nasal mucosa directly into local capillaries and, to some extent, along the olfactory pathway, not through the gut, so digestion isn't part of the process ^[1]. What can matter is the state of your nasal passages. A congested nose, from a cold or allergies, will reduce how much of the spray actually gets absorbed rather than dripping down your throat or being blown out. Some people blow their nose gently before dosing to clear the passage, though this is basic practical advice rather than something studied specifically for selank. There's no published interaction data on selank and food, alcohol, or common medications, which is another gap that traces back to the limited scope of Western-standard trials on this peptide. If you're on other medications, especially anything affecting mood, anxiety, or the central nervous system, that absence of interaction data is itself useful information: it means caution and a conversation with a doctor, not confidence that it's fine.

Where does the selank you buy actually come from, and does purity matter for dosing?

In Russia, selank is manufactured and sold as a registered pharmaceutical nasal spray with a listed concentration on the packaging (commonly 0.15%), which is why the Russian clinical dosing numbers translate reasonably cleanly to real-world use there. Outside Russia, selank sold in the US or EU is not an approved drug; it's sold as a research chemical, typically as lyophilized powder, and the regulatory oversight of that supply chain is much thinner. That gap matters directly for dosing accuracy. If you're reconstituting powder yourself, your actual dose per spray depends on: the purity and actual peptide content of the vial (which varies by supplier and isn't independently verified in most cases), how precisely you measure the bacteriostatic water added, and the delivery volume of whatever nasal spray pump or dropper you're using. A vial listed as 10 mg could reasonably be off by a meaningful margin in either direction if the manufacturer's quality control is loose, and there's no FDA testing requirement forcing accuracy the way there would be for an approved drug. This is one of the areas where going through a provider-reviewed route matters practically, more than as a trust signal. Selank Co reviews sourcing information and points readers toward pharmacy partners that fulfill orders, rather than compounding or manufacturing anything itself, which is a meaningfully different supply chain than an unverified overseas peptide vendor. It doesn't turn selank into an FDA-approved product, but it does reduce the odds that your "250 mcg dose" is actually some unknown fraction of that.

What's the safest way to start if you're new to selank?

Start low, and start with a route you can control precisely. Given the 250 to 3000 mcg/day range in the literature, most people beginning selank use start toward the bottom, something like 200 to 300 mcg total per day, split into two doses, for the first several days, before considering an increase toward the 900 mcg/day level used in some Russian GAD trials ^[2]. Keep a course short the first time; 7 to 10 days is a reasonable initial trial length rather than jumping straight to a 3-week course. Pay attention to how you feel in the first few days, since individual response varies and the published studies are group averages, not guarantees for any one person. Stop and reassess if you notice anything concerning rather than pushing through on the assumption that more is better; the selank side effects page covers what's actually been reported. If you're on any psychiatric medication, are pregnant or breastfeeding, or have a diagnosed anxiety or mood disorder under active treatment, talk to a doctor before starting, full stop. Selank has not been studied for interactions with SSRIs, benzodiazepines, or other common psychiatric medications in any controlled way, and "no data" is not the same as "safe."

Frequently asked questions

How many mcg of selank should I take per day?

Russian clinical and pharmacology sources describe a range of roughly 250 to 3000 mcg per day, most often split into two or three intranasal doses. Many trials for anxiety land around 900 mcg/day (three doses of 300 mcg) over a 14-day course. There's no single confirmed "correct" dose; the range reflects different studies and conditions, not one settled protocol ^[3][4].

Can you take selank orally instead of intranasally?

No published protocol uses oral selank, because it's a peptide that gets broken down by digestive enzymes before it could have an effect. Every clinical study and the approved Russian pharmaceutical product use the intranasal route. Some in the research community use subcutaneous injection instead, but oral administration isn't a route with any supporting data.

How long can you take selank before needing a break?

Most Russian trials run courses of 10 to 14 days, occasionally up to 3 weeks, followed by a break. There's no published data on continuous use over months, so long-term daily dosing is not something the literature can actually speak to. People who cycle it long-term are doing so on assumption and community practice, not clinical evidence.

Is selank FDA approved?

No. Selank is registered as a prescription drug in Russia but has no FDA approval or review in the United States for any use. It's sold in the US as a research chemical, not as an approved medication. Russian regulatory approval reflects a different evidentiary and regulatory standard than FDA approval and shouldn't be treated as equivalent.

What's the difference between selank and semax dosing?

Selank and semax are different peptides from the same Russian research lineage; selank is a tuftsin analog studied for anxiety, semax is an ACTH-fragment analog studied for cognition and neuroprotection. Their typical daily dose ranges and study protocols differ, so dosing instructions for one shouldn't be applied to the other. See selank vs semax for a direct comparison.

Does selank need to be refrigerated?

Peptides in general are temperature-sensitive, and lyophilized selank powder is typically recommended to be stored refrigerated or frozen before reconstitution, with the reconstituted solution kept refrigerated and used within a limited window (commonly cited as a few weeks) to preserve potency. Exact stability data specific to selank in Western storage studies is limited, so err on the side of caution.

Can selank and semax be taken together?

Some people in the peptide research community combine them, reasoning that selank's calming effect pairs with semax's cognitive effect. There is no controlled clinical trial testing selank and semax together, so any combined protocol is based on anecdote and mechanism speculation rather than evidence. If you try it, treat dosing of each independently and cautiously.

How much selank is in one nasal spray?

It depends entirely on the concentration of the solution and the spray pump's delivery volume. The Russian pharmaceutical product is commonly described as a 0.15% solution, which works out to roughly 100 to 150 mcg per spray, but self-reconstituted research-chemical vials can vary a lot depending on how much water is added and the actual peptide content of the vial.

Is selank addictive or does it cause dependence?

There's no published evidence of addiction potential or physical dependence for selank in the way there is for benzodiazepines, but there also isn't long-term controlled human data ruling it out. Some anecdotal reports mention diminished effect with prolonged daily use, which is why many protocols use short courses with breaks rather than continuous daily dosing.

Why is most of the selank research in Russian?

Selank was developed by the Institute of Molecular Genetics of the Russian Academy of Sciences and has mainly been studied, registered, and used clinically within Russia. It hasn't gone through the large-scale, English-language, peer-reviewed randomized trial process that Western regulators like the FDA require, so the evidence base remains largely Russian-language and hasn't been independently replicated in Western trials.

What happens if you take too much selank?

There's no well-documented human overdose data for selank, since it hasn't gone through the toxicology and dose-escalation trials that an FDA-reviewed drug would require. Doses above the roughly 3000 mcg/day upper range described in Russian literature are simply untested territory. If you take more than intended, the responsible move is to stop, monitor for symptoms, and contact a doctor or poison control if anything feels wrong.

Where can I buy selank with confidence in what I'm actually getting?

Because selank isn't FDA-approved and is sold in the US through research-chemical channels with variable quality control, sourcing matters. A provider-reviewed route, like the one Selank Co points readers toward, connects buyers with a fulfilling pharmacy partner rather than an unverified overseas vendor, which reduces (though doesn't eliminate) the uncertainty around actual peptide content and purity.

Sources

1. National Center for Biotechnology Information, PubChem: Selank compound summary: Selank is a synthetic heptapeptide analog of tuftsin developed by the Institute of Molecular Genetics of the Russian Academy of Sciences
2. Zozulya et al., "New Drug Selank in the Therapy of Generalized Anxiety Disorder and Neurasthenia," Neuroscience and Behavioral Physiology, PMID 18512149: Selank has been tested at doses around 900 mcg/day (300 mcg three times daily) over roughly 14-day courses for generalized anxiety disorder
3. Kolyasnikova et al., pharmacological review of Selank dosing ranges, PMID 22135897: Published Russian pharmacology and clinical literature describes selank dosing across a range of roughly 250 to 3000 micrograms per day
4. Kolomin et al., "Neurogenetic and neuroprotective effects of Semax following cerebral ischemia," PMID 23016881: Semax is an ACTH-fragment analog studied mainly for cognitive and neuroprotective effects, including stroke rehabilitation research, distinct from selank's tuftsin-based mechanism
5. U.S. Food and Drug Administration, CFR Title 21 Part 314 (New Drug Applications): Selank has not gone through the FDA new drug application and approval process required for marketing an approved drug in the United States
6. Kolomin et al., "Neurogenetic and neuroprotective effects of the Selank peptide," Acta Naturae, PMID 22808410: Animal pharmacology studies describe selank's effects on BDNF expression, monoamine oxidase activity, and serotonin/GABA systems as proposed anxiolytic mechanisms