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Limited human dataNot FDA approved

Selank

Also known as: Selanc · Селанк · TP-7 · TKPRPGP · Thr-Lys-Pro-Arg-Pro-Gly-Pro · Selank acetate · Selank diacetate

Updated 97 sources

A seven amino acid peptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) built on tuftsin, a small immune peptide, with the same Pro-Gly-Pro tail as Semax. Russia sells it over the counter as 0.15% nasal drops for anxiety. People use it for anxiety, social nerves, a racing mind at night, and to take the edge off Semax. Human data are a few small Russian trials. Not approved in the US.

Quick facts

Half-life
  • Minutes. Per the Russian label, nasal Selank shows in plasma within 30 seconds and its level falls over 5 to 5.5 minutes. Nothing shows up in urine.
Routes
  • Nasal
  • Subcutaneous injection
Forms
  • Nasal spray
  • Vial (powder)
Reported dose ranges
  • 150 to 2,700 mcg (nasal)
  • 200 to 1,000 mcg (subcutaneous injection)
Vial sizes
  • 5 mg, 10 mg, 30 mg
FDA status
  • Not FDA approved
WADA
  • Not confirmed

What people use Selank for

  • Anxiety, social anxiety and performance nerves such as public speaking or flying
  • Quieting rumination and a racing mind at night, usually taken in the evening
  • Taking the edge off Semax in focus and ADHD-type stacks
  • Anger and irritability, less often
  • Tapering off SSRIs or SNRIs, a common forum topic with no interaction data behind it
  • Immune support, mostly in guide content rather than real use

How it is thought to work. Lab work shows Selank slows the enzymes that break down enkephalins, the body's own calming opioid peptides. Animal studies link it to changes in GABA-related gene expression, and cytokine shifts were seen in anxious patients. It is broken down into short fragments such as TKPRP, TKP, RP and GP. How it calms people is not fully mapped.

Selank dosing

24 protocols from studies, guides and community reports, grouped by goal. Tap a source badge to see where a number came from.

Anxiety2

Anxiety, Russian label course (nasal drops)

Amount
250 to 300 mcg
How often
3 times a day, 2 drops in each nostril
Route
Nasal, nasal spray
Cycle
14 days
Rest
1 to 3 weeks before a repeat course, if a doctor advises it; one guide says 1 month
Timing and details

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Anxiety (daily total, guide)

Amount
250 to 500 mcg
How often
Daily total, split into 2 or 3 doses
Route
Nasal, nasal spray
Cycle
14 to 30 days

Subcutaneous3

Subcutaneous, once daily (guide)

Amount
250 to 500 mcg
How often
Once daily
Route
SubQ, vial (powder)
Cycle
4 weeks on
Rest
4 weeks off

Subcutaneous (guide)

Amount
200 to 500 mcg
How often
Once daily
Route
SubQ, vial (powder)

Subcutaneous, weekdays (guide)

Amount
200 to 400 mcg
How often
Once daily, 5 days a week
Route
SubQ, vial (powder)
Cycle
30 days on
Rest
30 days off

Situational nasal2

Situational nasal (guide)

Amount
150 to 300 mcg
How often
As needed
Route
Nasal, nasal spray
Timing and details

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Situational nasal (community)

Amount
300 to 400 mcg
How often
As needed
Route
Nasal, nasal spray
Timing and details

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Other protocols: nasal, nasal spray13

Anxiety trial dose (daily total)

Amount
2,700 mcg
How often
Daily total; how it was split across the day is not reported
Route
Nasal, nasal spray
Cycle
Up to 21 days, per one guide's account of the trial work
Timing and details

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Intranasal range (daily total, guide)

Amount
600 to 2,700 mcg
How often
Daily total, split into several doses
Route
Nasal, nasal spray
Cycle
14 to 21 days on
Rest
1 to 3 weeks off

Beginner nasal (guide)

Amount
200 to 300 mcg
How often
Once daily
Route
Nasal, nasal spray
Cycle
2 to 4 weeks on
Rest
1 to 2 weeks off

Intermediate nasal (daily total, guide)

Amount
400 to 500 mcg
How often
Daily total, split into 2 doses
Route
Nasal, nasal spray
Cycle
2 to 4 weeks on
Rest
1 to 2 weeks off

Advanced nasal (daily total, guide)

Amount
600 to 900 mcg
How often
Daily total, split into 2 or 3 doses
Route
Nasal, nasal spray
Cycle
2 to 4 weeks on
Rest
1 to 2 weeks off

Cognition (guide)

Amount
300 to 500 mcg
How often
Once daily, in the morning
Route
Nasal, nasal spray
Cycle
10 to 20 days

Immune support (guide)

Amount
400 to 500 mcg
How often
Once daily, in the morning
Route
Nasal, nasal spray
Cycle
21 to 30 days
Timing and details

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Standard nasal (guide)

Amount
200 to 400 mcg
How often
2 to 3 times a day
Route
Nasal, nasal spray
Timing and details

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Anxiolytic and nootropic nasal (guide)

Amount
250 to 900 mcg
How often
2 to 3 times a day
Route
Nasal, nasal spray
Cycle
30 days on
Rest
30 days off

Split nasal dosing (guide)

Amount
250 to 500 mcg
How often
2 to 3 times a day
Route
Nasal, nasal spray
Cycle
2 to 4 weeks

Nasal spray ramp (daily total, guide)

Amount
200 to 400 mcg
How often
Daily total: about 200 mcg in week 1, then about 400 mcg
Route
Nasal, nasal spray
Cycle
6 weeks
Titration (2 steps) and details

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Daily nasal, split (community)

Amount
250 to 400 mcg
How often
2 to 3 times a day
Route
Nasal, nasal spray
Cycle
Up to about a month
Timing and details

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Single morning nasal dose (community)

Amount
800 mcg
How often
Once daily, in the morning
Route
Nasal, nasal spray

Other protocols: injected4

Situational subcutaneous (community)

Amount
250 to 333 mcg
How often
As needed, before events or in the evening for sleep
Route
SubQ, vial (powder)

Daily subcutaneous (community)

Amount
250 to 1,000 mcg
How often
Once daily
Route
SubQ, vial (powder)
Timing and details

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Twice daily subcutaneous (community)

Amount
500 mcg
How often
Twice daily
Route
SubQ, vial (powder)

Subcutaneous ramp, weekdays (community)

Amount
300 to 1,000 mcg
How often
Once daily, 5 days on and 2 off
Route
SubQ, vial (powder)
Cycle
8 weeks
Timing and details

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Doses shown are what sources report, labelled by origin. Not medical advice.

Full Selank dosage guideEvery titration step in syringe units, missed doses and how to mix.

Vial strengths and syringe units

Every Selank vial size with the water volumes sources use. Units are what to draw on a U-100 insulin syringe, worked out exactly.
Selank: concentration and U-100 syringe units for each vial size and water volume
WaterStrength200 mcgdose, units250 mcgdose, units500 mcgdose, units
5 mg vial
1 mLCompetitor guide†5 mg/mL40.04 mL50.05 mL100.1 mL
2 mLCompetitor guide†2.5 mg/mL80.08 mL100.1 mL200.2 mL
3 mLCommunity-reported†1.667 mg/mL120.12 mL150.15 mL300.3 mL
6 mLCompetitor guide†0.833 mg/mL240.24 mL300.3 mL600.6 mL
10 mLCompetitor guide†0.5 mg/mL400.4 mL500.5 mL1001 mL
10 mg vial
1 mLCompetitor guide10 mg/mL20.02 mL2.50.025 mL50.05 mL
2 mLCompetitor guide5 mg/mL40.04 mL50.05 mL100.1 mL
3 mLCommunity-reported3.333 mg/mL60.06 mL7.50.075 mL150.15 mL
30 mg vial
3 mLCompetitor guide10 mg/mL20.02 mL2.50.025 mL50.05 mL
6 mLCompetitor guide5 mg/mL40.04 mL50.05 mL100.1 mL
10 mLCompetitor guide3 mg/mL6.70.067 mL8.30.083 mL16.70.167 mL
Units are on a U-100 insulin syringe (100 units = 1 mL). U-50 and U-30 barrels read the same units.† Water volume sourced for a different vial size. The math is exact either way.Water volumes from

Doses shown are what sources report, labelled by origin. Not medical advice.

Calculate with this peptideYour vial, your water, your dose: Selank in syringe units, with the math shown.

What people report

What Selank users write on Reddit, counted post by post. These are reports, not measured rates or advice.

Community-reportedFrom 900 Reddit posts and comments, last mined Oct 23, 2026r/Biohackers, r/Peptides, r/Nootropics, r/Peptidesource

Doses people report for Selank

Focus and mood74 mentions

Amounts reported for focus and mood, with mention counts
ReportedMentions
500 mcg16
400 mcg10
250 mcg9
300 mcg9
200 mcg8

Goal not stated53 mentions

Amounts reported for goal not stated, with mention counts
ReportedMentions
500 mcg14
200 mcg9
100 mcg7
0.5 mg4
300 mcg4

Left out: 3 mentions given in syringe units, which mean different doses in different mixes.

How often

Dosing frequencies reported, with mention counts
ReportedMentions
Once a day44
Twice a day9
5 days on, 2 off9
As needed6
Twice a week3

Most mentioned alongside

Side effects people mention

  • Insomnia8 mentions

    Most common fix: stop taking it (2)

  • Anxiety6 mentions

  • Headache4 mentions

  • Irritability2 mentions

  • Adrenaline rush2 mentions

  • Fatigue2 mentions

Doses shown are what sources report, labelled by origin. Not medical advice.

Selank side effects

What trials and labels report, kept apart from what users and guides report. Frequencies are worded as each source states them.

Reported in studies and labels2

From clinical trials and regulatory documents.

  • Unpleasant taste

    Listed on the Russian label when drops run into the throat; no rate given

  • Allergic reaction

    Listed on the Russian label for people who are sensitive to the product; no rate given

Reported by users and guides6

From community reports and dosing guides. Not measured rates.

  • Nasal burning, irritation or nosebleeds

    Users tie the burn to bacteriostatic water in DIY sprays. One guide puts nasal irritation at 10 to 15% at higher doses, without a source.

    How people manage it

    • Users switch to sterile saline or sterile water instead of bacteriostatic water in sprays
  • Headache, nausea or flushing

    One r/Peptides user had all three at 200 mcg subQ. One guide says headache is occasional in the first 1 to 3 days; another puts it at 5 to 10%, without a source.

    How people manage it

    • Lower the dose or switch route
  • Fatigue

    Called rare by one guide; another puts it at 5 to 8%, without a source

  • Emotional blunting or a flat, zombie feeling

    Reported by a few r/Peptides users, often while on other compounds too

    How people manage it

    • Lower the dose or switch route
  • Hair shedding

    A few anecdotal, confounded reports on r/Peptides; others in the same thread saw no hair loss. No study reports it.

  • Paradoxical anxiety, palpitations or panic

    Rare user reports: paranoia, palpitations and a panic attack followed by a crash. One user had worse anxiety on subQ but relief on nasal.

    How people manage it

    • Switch route; one user found nasal calmer than subQ
All 10 Selank side effects and how people manage themEvery management tip, who should not use it, and side-effect questions.

Storage

Powder (before mixing)

Temperature
-20 to 8 °C

Fridge at 2 to 8 C with an 18 to 24 month shelf life per one guide. Another says freeze at -20 C for long-term storage and use the fridge short term.

Mixed vial

Use within
21 days

Guides disagree on how long mixed Selank keeps: 2 to 3 weeks, 3 to 4 weeks, or 21 to 30 days. 21 days is the window all three allow.

As supplied

Use within
15 days

Russian 0.15% drops: unopened, keep away from light at 10 C or below and do not freeze; shelf life is 2 years. Once opened, keep at 25 C or below and use within 15 days. One drug reference lists 2 to 8 C instead.

Mixed with: Bacteriostatic water for injection; sterile saline or sterile water for nasal sprays

Mixing. For sprays, users dilute further so one pump gives the dose they want. 10 mg in 5 mL gives about 200 mcg per 0.1 mL pump; 10 mg in 10 mL gives 100 mcg. Pumps vary from about 0.025 to 0.20 mL, so calibrate yours.

Stacks people report

Combinations from guides and community posts, with the reason given.
  • Semax

    By far the most common pairing on r/Peptides: Semax in the morning for drive, Selank later for calm. Some users only tolerate Semax with Selank alongside. One guide suggests Semax 100 to 200 mcg plus Selank 250 mcg in the morning, or Semax 200 to 300 mcg AM and Selank 250 to 500 mcg PM. Critics of premixed blends say they lock you into a 1:1 ratio.

  • PE-22-28

    Mentioned by an r/Peptides user as an add-on for mood.

  • Bromantane

    Named alongside Selank in an r/Peptides anxiety thread. No dose or rationale given.

  • Oxytocin

    One r/Peptides user adds 100 mcg oxytocin subQ for social anxiety.

  • NAD+

    Run together with Semax and Selank in a long-running r/Biohackers log.

  • Pinealon

    Some users follow a Semax and Selank cycle with Pinealon.

Related versions

  • Selank with an acetyl group added to the front of the chain (about 794 g/mol vs 752). Sold as N-acetyl Selank or NA-Selank Amidate. No clinical or preclinical study exists on it.

Compare Selank

Evidence and legal status

Evidence: limited human data

Human data come from small Russian trials: 62 patients vs medazepam, 60 vs phenazepam, 70 as an add-on to phenazepam, plus a cytokine study. The label reports 92.8% nasal bioavailability. Animal work covers route comparisons, nose-to-brain delivery and GABA-related genes. A ClinicalTrials.gov search on 2026-10-23 found no registered Selank trials.

FDA and WADA

Not FDA approved

An approval withdrawn, or removed from FDA's compounding lists.

Not FDA approved. FDA lists Selank acetate (TP-7) among bulk substances nominated for compounding and then withdrawn, noting possible immunogenicity and missing human safety information. It is not on the Category 2 list.

Registered in Russia as 0.15% nasal drops (ЛП-№(010951)-(РГ-RU) since July 15, 2025, replacing ЛСР-003338/09), held by Peptogen and sold without a prescription; ATC N05BX. One guide says it is not on the WADA Prohibited List. WADA's own site could not be checked, so whether it falls under the S0 class for unapproved substances is not verified. Belgian regulators found Selank in seized products.

WADA: Not confirmed

Selank questions

What is the typical Selank dose?

Most guides land at 250 to 500 mcg per nasal dose, 2 to 3 times a day, or 250 to 500 mcg once a day by injection. The full spread runs from 100 to 1,000 mcg per dose and 200 to 2,700 mcg a day. The 2,700 mcg figure comes from a small Russian anxiety study as cited by guides.

Nasal spray or injection?

The Russian label and every human trial use the nose. Users split both ways: some find nasal stronger and subQ useless, others the reverse. One commenter claims subQ needs 1.5 to 2 times the nasal dose, with no source behind it.

How fast does Selank work?

The maker says 5 to 20 minutes in healthy people. In anxiety disorders, about half respond on day 1 and the rest from day 3. Users report anything from 5 to 10 minutes to only feeling it on a second cycle.

What is the half-life of Selank?

Minutes. The Russian label says nasal Selank appears in plasma within 30 seconds and its level falls over 5 to 5.5 minutes. Guide figures, mostly unsourced, run from about 2 to 10 minutes: 2 to 10, 2 to 5, about 3, about 2 in the lab, and 2 to 3. It breaks down into short fragments (TKPRP, TKP, RP, GP).

How long does one dose last?

In the blood, minutes. The effect lasts longer: the maker says up to 24 hours. Guides say 3 to 6 hours or 12 to 24 hours. Users report about 3 to 4 hours nasal and 4 to 5 hours or all day subQ.

Daily or as needed?

Both are common on r/Peptides. Some take 250 mcg before stressful events. Others run it daily, for example 500 mcg 5 days a week.

How much Selank is in one spray?

It depends on the mix and the pump. Most pumps deliver about 0.1 mL, so a 2 mg/mL spray gives about 200 mcg per spray. Pump output ranges from about 0.025 to 0.20 mL by device. Ready-made sprays seen by users deliver 50 or 100 mcg per spray.

How do I turn a vial into a nasal spray?

Common recipes: 10 mg in 5 mL gives about 200 mcg per 0.1 mL spray; 10 mg in 10 mL gives 100 mcg; 10 mg in 6.67 mL gives 150 mcg. Some dissolve 10 mg in 2 mL bacteriostatic water and add 8 mL saline. For a 5 mg vial, 4 mL gives 125 mcg per spray and 2 mL gives 250 mcg. Calibrate your pump on a known volume before trusting the math.

Can I use bacteriostatic water in a nasal spray?

It works, but users report it burns and can cause nosebleeds. Many use sterile saline or sterile water instead and keep the spray in the fridge.

Does Selank need refrigeration?

The Russian drops keep at 25 C or below for 15 days once opened. DIY sprays: yes. Users say refrigerate and discard after 30 days or if the liquid turns cloudy or smells off. Saline sprays have no preservative, so the fridge matters more. One user claims 60 to 90 days. Another found mold in the pump head and swaps it every 2 to 3 weeks.

Why do I feel nothing?

No effect is the most common complaint on r/Peptides. Reports include nothing at up to 2 mg subQ or 600 mcg nasal, nothing after 7 weeks at 1 mg, and nothing after 2 weeks at 500 mcg. One user felt nothing until a second cycle. Some find a route switch helps.

Does tolerance build up?

The label says there is no dependence or habituation. Users mostly report no tolerance, including one who ran 500 mcg 5 days a week for 2 years. A thread titled 'stopped working after 2 days' exists, but its post was removed.

Is there Selank withdrawal?

None per the label. Some users notice stress returning after they stop. Users say the effect lingers 1 to 2 days to 2 to 3 weeks after stopping. In the phenazepam trial, the anti-anxiety effect lasted a week after the last dose.

How should I cycle it?

The label runs 14-day courses with 1 to 3 weeks between them. User patterns include 500 mcg daily for 40 days, 2 weeks off, then repeat; 4 weeks on and 4 off; 5 weeks on and 2 to 4 off; 6 weeks on every 3 months. One user runs it 5 days a week with no breaks.

Can I take Selank with an SSRI or SNRI?

There is no interaction data for these drug classes. The label says Selank combines with any psychoactive or neuroactive therapy. Users warn about serotonin effects, and coming off SSRIs with Selank is a frequent forum topic. Talk to your prescriber before changing an antidepressant.

Can I drink alcohol on Selank?

The maker says yes and claims it reduces alcohol toxicity. No independent data back that claim.

Can I drive on Selank?

Yes, per the label, which says it is not sedating.

Does Selank cause hair loss?

Only a few anecdotal reports exist, usually from people on other compounds too. Semax gets blamed more often. No study reports it.

Is N-acetyl Selank amidate worth the extra cost?

There is no data either way. No clinical or preclinical study exists on the acetylated form, and the stronger, longer-lasting claims are unsourced. User reports are mixed.

Ask about Selank

Answers come from this site's pages only, with a link to each source.

Sources

97 sources, each checked by date. Record updated Oct 24, 2026. Numbers are restated in our own words and labelled by where they came from.

Clinical study14

  1. Peptides found in seized products (Vanhee 2020)PubMed · checked Oct 23, 2026
  2. Selank dosingpeptideprotocolwiki.com, via a competitor guide · checked Oct 23, 2026
  3. Selank 10 mg vial dosage protocolpeptidedosages.com, via a competitor guide · checked Oct 23, 2026

Regulatory4

  1. Certain bulk drug substances for use in compounding that may present significant safety risksFDA · checked Oct 23, 2026
  2. Selank instruction for use (Russian label)selank.ru (Peptogen), archived copy, via a vendor guide · checked Oct 24, 2026
  3. Selank 0.15% nasal dropsVidal, via a reference work · checked Oct 24, 2026

Reference work1

  1. SelankWikipedia · checked Oct 23, 2026

Vendor guide1

  1. Selank questions and answersselank.ru (Peptogen), archived copy · checked Oct 24, 2026

Competitor guide14

  1. Selankbodyhackguide.co · checked Oct 23, 2026
  2. Selankpeptiq.io · checked Oct 23, 2026
  3. Selank reconstitution, 10 mgpeptiq.io · checked Oct 23, 2026

Community-reported63

  1. What dose of Semax/Selank works for you? (comment)r/Peptides · checked Oct 23, 2026
  2. Semax/selank blend (comment)r/Peptides · checked Oct 23, 2026
  3. Selank has been a game changer (comment)r/Peptides · checked Oct 23, 2026