Reviewed by the PeptideMind Team · Updated August 10, 2026
Selank vs N-Acetyl Selank Amidate:
Key differences comparison
The main difference between Selank and N-Acetyl Selank Amidate is durability, not the underlying effect. NA-Selank Amidate is Selank with two chemical modifications, N-acetylation and C-terminal amidation, added to resist enzyme breakdown. That extends its half-life from roughly 25 to 30 minutes to about 2.5 to 4 hours. Selank has a documented clinical history in Russia; NA-Selank Amidate is a research-community variant with far less formal study behind it.
As seen on
What Is Selank?
Selank is a lab-made peptide developed in Russia and officially approved there to treat generalized anxiety and nervous exhaustion. It works by supporting a calming brain chemical (GABA) and boosting a brain-growth protein (BDNF), producing calming effects similar to anti-anxiety medications like Xanax, but without the sedation, tolerance, or dependency risk.
A calming, tuftsin-based design
Selank is a synthetic analog of tuftsin, an immune-system peptide, engineered to support GABA and raise BDNF levels in the brain.
What it's best known for
Reducing generalized anxiety with efficacy reported to be comparable to the anti-anxiety drug medazepam, without sedation or withdrawal risk.
Where it stands legally
Selank is officially approved in Russia for anxiety-related use. In the United States it has no FDA approval and is sold only as a research chemical.
What Is N-Acetyl Selank Amidate?
N-Acetyl Selank Amidate (NA-Selank Amidate) is a chemically modified version of Selank, tweaked to get into the brain more easily and last longer once there. It supports the same GABA and BDNF pathways as native Selank, but the modifications protect it from being broken down, so researchers treat it as a more stable, longer-lasting version of the original peptide.
A modified, longer-lasting design
N-acetylation and C-terminal amidation shield both ends of the molecule from the enzymes that quickly break down native Selank.
What it's best known for
Serving as a longer-lasting alternative to Selank in research settings, with a plasma half-life reported at roughly 2.5 to 4 hours versus about 25 to 30 minutes for the native peptide.
Where it stands legally
NA-Selank Amidate has no FDA approval and no Russian regulatory approval either. It's sold strictly as an unregulated research chemical, not for people to use on themselves.
Selank vs N-Acetyl Selank Amidate at a Glance
A side-by-side look at how Selank and N-Acetyl Selank Amidate differ in how they work, how they're dosed, and where each stands legally.
Overview
- Type
- Single peptide
- Primary category
- Cognitive
- Secondary categories
- LongevityImmunity
- Research status
- Approved
- FDA approved
- Not FDA approved
- Popularity
- 8/10
- Body targets
- Brain
- Price range
- Human trial status
- Human pilot studies
- Legal status
- Research chemical
- WADA status
- Not banned
Dosing
- Dose
- 250–500 mcg
- Frequency
- Daily
- Cycle
- 4–8 weeks
- Route of administration
- Nasal
- Common vial sizes
- 5mg10mg
Research
- Molecular weight
- 751.89 g/mol
- Half-life
- 0.5 hrs
- Median onset
- —
- Prescription alternative
- Has alternative
- Receptor target
- GABAA_RECEPTOR
- Receptor action
- Modulator
- Mechanistic pathways
- Neuropeptide CognitiveImmune Modulating
Included in
Overview
- Type
- Single peptide
- Primary category
- Cognitive
- Secondary categories
- LongevityImmunity
- Research status
- Experimental
- FDA approved
- Not FDA approved
- Popularity
- 1/10
- Body targets
- Brain
- Price range
- Human trial status
- Anecdotal human reports
- Legal status
- Research chemical
- WADA status
- Not banned
Dosing
- Dose
- 200–600 mcg
- Frequency
- 1-3x/day
- Cycle
- 2 weeks on, 1 week off
- Route of administration
- Subcutaneous
- Common vial sizes
- 5mg10mg+1
Research
- Molecular weight
- 793.92 g/mol
- Half-life
- 3 hrs
- Median onset
- —
- Prescription alternative
- Has alternative
- Receptor target
- —
- Receptor action
- Modulator
- Mechanistic pathways
- Neuropeptide CognitiveImmune Modulating
Included in
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Comparison at a Glance: Selank vs N-Acetyl Selank Amidate
A quick side-by-side look at how Selank and N-Acetyl Selank Amidate differ in durability, evidence, and where each stands as a research compound.
How long each one lasts
Native Selank clears the body quickly, with a half-life of roughly 25 to 30 minutes. NA-Selank Amidate's chemical modifications extend that to about 2.5 to 4 hours, so fewer doses are typically needed per day.
Strength, not just duration
Some research-community sources describe NA-Selank Amidate as effective at lower doses than native Selank, but this is a community heuristic drawn from the chemistry, not a measured, published finding.
Depth of evidence
Selank has completed Phase III clinical trials in Russia for generalized anxiety disorder. NA-Selank Amidate has no published human trials, so its profile is inferred largely from Selank's data and its own chemistry.
Legal and research status
Selank is an approved medication in Russia. NA-Selank Amidate carries no regulatory approval anywhere. Neither has FDA approval in the United States, so both are sold only as research chemicals here.
Selank Dosage Guide for Cognitive EnhancementSelank Dosage Calculator
Selank is a lab-made peptide that can help calm anxiety and sharpen focus and memory, usually taken as a nasal spray. It doesn't make you drowsy and isn't habit-forming.
Vial size
5 mg
Bacteriostatic water
Nasal spray - no BAC needed
Dosing
250–500 mcg
Frequency
Daily
Cycle
4–8 weeks
Benefit
Cognitive Enhancement
NA-Selank Amidate Dosage Guide for Cognitive EnhancementNA-Selank Amidate Dosage Calculator
NA-Selank Amidate is a modified, longer-lasting version of the calming peptide Selank, taken as a nasal spray. People use it for easing anxiety, steadying mood, and supporting focus and memory, often reporting effects that build gradually without drowsiness or dependency.
Vial size
10 mg
Bacteriostatic water
2 mL
Dosing
200–600 mcg
Frequency
1-3x/day
Cycle
2 weeks on, 1 week off
Benefit
Cognitive Enhancement
Selank vs NA-Selank Amidate: Which One Should You Research?
Selank and NA-Selank Amidate aren't typically combined, since they target the same pathways. The choice mostly comes down to whether the research calls for the more-studied original or the longer-acting analog.
If clinical history matters most
Selank is the better-documented choice, with completed Phase III trials in Russia for generalized anxiety disorder behind it.
If longer duration is the priority
NA-Selank Amidate is built to resist breakdown, giving it a longer reported half-life and, in theory, fewer doses needed across a day.
Neither is an approved US product
Selank is approved in Russia; NA-Selank Amidate is approved nowhere. In the United States, both are sold strictly as research chemicals, not for people to use on themselves.
Frequently Asked Questions: Selank vs N-Acetyl Selank Amidate
Straight answers on how Selank and N-Acetyl Selank Amidate compare, and how each is dosed. For research reference only.
Selank vs NA-Selank Amidate: Dosing Basics
Both peptides are studied through similar routes, but the amounts and dosing frequency differ because of NA-Selank Amidate's longer half-life.
Selank dosing
Commonly discussed at roughly 750 mcg per day, split across doses and administered daily, typically run in 10 to 14 day cycles followed by a break.
NA-Selank Amidate dosing
Commonly discussed at roughly 200 to 500 mcg per dose, taken once or twice daily via nasal spray or subcutaneous injection, typically run 14 days on followed by 1 to 3 weeks off.
Use a peptide-specific calculator
Vial concentration and delivery method both change the actual draw for either peptide. Use a dosage calculator to get an exact number instead of guessing from a general range.
What to Expect: A Week-by-Week Timeline
Timelines vary by person, dose, and which peptide is used, but research and community reports describe a broadly similar pattern for both.
Day 1 to 7
Selank's calming effect is commonly reported within the first hour of a dose. NA-Selank Amidate's effect is also reported early, but is described as building more gradually across the day given its longer half-life.
Weeks 2 to 3
Cumulative effects on stress reactivity and mood are commonly described as building over this window, lining up with Selank's typical 10 to 14 day cycle and NA-Selank Amidate's 14 day on-phase.
After stopping
Effects are generally reported to fade gradually after stopping either peptide, without the rebound anxiety or withdrawal symptoms linked to some anti-anxiety medications, based on available research and community reports.
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