What is the dosing range for N-Acetyl Selank?

N-Acetyl Selank is typically dosed at 100mcg (low), 250mcg (moderate), or 500mcg (high) mcg, administered 1–2x daily intranasal. These ranges are aggregated from preclinical research and community protocols — not medical dosing guidance.

What are the reported side effects of N-Acetyl Selank?

Reported side effects of N-Acetyl Selank include: Mild sedation (acute), Fatigue, Headache (rare), Nasal irritation (intranasal route), Drowsiness at higher doses.

Nootropic

N-Acetyl Selank

Also known as: Selank-A, N-Ac-Selank, acetylated selank, N-acetyl selank

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N-Acetyl Selank is a research compound. Not approved for human use outside Russia.

📚 Content aggregated from:2 peer-reviewed sources·r/Peptides community·PubMed / NCBI

Overview

Acetylated variant of Selank with enhanced stability and bioavailability. The N-acetyl modification protects the peptide from rapid enzymatic degradation, extending its active half-life relative to standard Selank. Provides anxiolytic, nootropic, and immunomodulatory effects comparable to or exceeding standard Selank with potentially greater duration from each dose.

Research Summary

N-Acetyl Selank shares Selank's core mechanism — BDNF/NGF upregulation, enkephalinase inhibition, and GABA-A receptor complex modulation — with improved metabolic stability from the N-terminal acetyl group. The acetyl modification protects against aminopeptidase N and angiotensin-converting enzyme cleavage, extending the peptide's active residence time in neural tissue after intranasal administration.

Dosing Range

low

100mcg

moderate

250mcg

high

500mcg

Units: mcg · Frequency: 1–2x daily intranasal

Dosing ranges are aggregated from preclinical research and community protocols. Not medical dosing guidance.

Administration Routes

Intranasal spraySubcutaneous injection

Reconstitution Notes

Reconstitute with sterile water or sterile saline. For nasal administration: prepare 0.15% solution (1.5mg/mL). Use preservative-free nasal delivery device. Stable 30 days refrigerated at 2–8°C. Protect from light.

Step-by-step reconstitution guide →

Supplies you'll need

Insulin Syringes (U-100)Reconstitution Needles Lambda BAC Water Alcohol Prep Pads

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Reported Side Effects

Mild sedation (acute)
Fatigue
Headache (rare)
Nasal irritation (intranasal route)
Drowsiness at higher doses

Research Papers

2 peer-reviewed sources

Selank pharmacology: anxiolytic and nootropic effects

Eksperimental'naia i Klinicheskaia Farmakologiia2001

Selank modulation of BDNF and immune function

Bulletin of Experimental Biology and Medicine2010

Community Experiences

Aggregated from public forums. Anecdotal — not clinical evidence.

r/Nootropics

Community reports comparing N-Acetyl Selank to standard Selank for anxiety, mood, and cognitive clarity.

View original thread

r/Peptides

Researcher discussion on stability differences between N-Acetyl Selank and Selank and dosing protocols.

View original thread

Overview

N-Acetyl Selank is the N-terminally acetylated form of Selank — a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) developed at the Institute of Molecular Genetics in Russia as an analogue of the endogenous neuropeptide tuftsin. While standard Selank has been studied as an anxiolytic and cognitive enhancer for decades in Russia, N-Acetyl Selank represents a pharmacokinetic optimization of the same molecule.

The N-acetyl group at the amino terminus blocks the primary site of enzymatic attack (aminopeptidases cleave N-terminal amino acids), substantially extending the peptide's half-life and increasing the duration of its effects after intranasal administration.

Mechanism

Shared with Standard Selank

N-Acetyl Selank shares all of Selank's core mechanisms:

1. Enkephalin System Selank inhibits the enzymes that degrade enkephalins (endogenous opioid pentapeptides) — enkephalinase (NEP/CD10) and angiotensin-converting enzyme (ACE). By protecting endogenous enkephalins from degradation:

Extends duration of endogenous opioid signaling at δ-opioid receptors
Produces anxiolytic and mood-positive effects without direct opioid receptor binding
Avoids tolerance/dependence concerns of direct opioid agonists

2. BDNF and NGF Upregulation Selank increases expression of:

BDNF in hippocampus and prefrontal cortex → improved memory consolidation, reduced anxiety
NGF in basal forebrain → cholinergic system support

3. GABA-A Receptor Complex Modulation Selank enhances GABAergic inhibitory tone — similar in direction to benzodiazepines but via a different binding site. This contributes to its anxiolytic effect without sedation at therapeutic doses.

4. IL-6 and Cortisol Modulation Selank reduces excess IL-6 and cortisol in chronically stressed subjects, normalizing the neuroimmune stress response.

N-Acetyl Enhancement

The acetyl group specifically:

Protects against aminopeptidase N cleavage at the N-terminus
Reduces ACE degradation of the Arg-Pro sequence
Increases lipophilicity slightly, potentially improving nasal mucosal absorption and BBB penetration
Extends the effective duration of each dose (estimated 50–100% longer activity)

N-Acetyl Selank vs. Standard Selank

| Parameter | Selank | N-Acetyl Selank | |-----------|--------|-----------------| | Enzymatic stability | Standard | Enhanced | | Duration per dose | Shorter | Longer | | Dose | 250–500mcg | 100–250mcg (per dose) | | Onset | Fast | Fast | | Cost | Lower | Higher | | Research base | Larger (Selank) | Smaller (extrapolated) |

Selank vs. N-Acetyl Semax

For reference, the analogous N-acetylation is also applied to Semax → N-Acetyl Semax, with the same rationale:

| Property | N-Acetyl Selank | N-Acetyl Semax | |----------|-----------------|----------------| | Primary effect | Anxiolytic, cognitive | Cognitive, stimulating | | BDNF/NGF | Both | NGF emphasis | | Anxiety | Reduces | May transiently increase | | Best for | Anxiety + cognition | Focus + motivation |