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FDA Category 2 · restricted from compounding

This compound is on the FDA’s interim Section 503A Category 2 bulks list and cannot be legally compounded by US pharmacies. An HHS announcement in February 2026 signaled intent to restore several peptides to Category 1, but no Federal Register action has been published. Check the FDA PCAC schedule for updates.

Read the full regulatory context
PreclinicalCognitiveIntranasalDailyPartial data

NA-Selank

N-Acetyl Selank

Acetylated Selank analog with improved half-life and oral/intranasal stability.

§ 01   Overview

Overview

Acetylated Selank analog with improved half-life and oral/intranasal stability.

Limited independent data beyond Selank literature.

§ 02   Mechanism

Mechanism of action

NA-Selank is N-acetylated, improving proteolytic stability vs. Selank while retaining the anxiolytic and immunomodulatory profile.

  • 01Similar anxiolytic profile to Selank
  • 02Longer half-life

§ 03   Dosing

Dosing protocol

Standard Protocol

Dose Range
250 – 900 mcg per dose
Route
Intranasal
Timing
AM or during stress
Frequency
Daily

§ 04   Evidence

Evidence & research

Preclinical

Limited independent data beyond Selank literature.

FDA Status

Not FDA-approved.

§ 05   Stacks

Common stacks

§ 07   Sourcing

Sourcing & supply

Regulatory status

Restricted from compounding

Placed on the FDA's 503A Category 2 list and cannot be lawfully compounded in the US. No brand pharmacy alternative exists. US buyers encounter only research-use-only (RUO) channels, which the FDA's Intended Use Doctrine treats as unapproved drug sales.

International · 2

International

Cosmic Nootropic

The most credible Russian / Khavinson source for US buyers. Sources authentic bioregulators through 'Peptides Company' (ex-NPCRIZ).

Visit
International

Rupharma

12+ year Russian pharmacy reseller. Reviews.io 4.84/5 (81+). Has a genuine US warehouse for common peptides.

Visit

Listings are informational, not endorsement. Verify credentials and flags against FDA and PCAB databases before purchasing. Full directory & how to verify →

§ 09   Safety

Safety & side effects

Side effects

  • 01Mild nasal irritation

Contraindications

None specified.

§ 10   Questions

NA-Selank FAQ

What is NA-Selank?
Acetylated Selank analog with improved half-life and oral/intranasal stability. NA-Selank is N-acetylated, improving proteolytic stability vs. Selank while retaining the anxiolytic and immunomodulatory profile.
What is NA-Selank used for?
Reported uses include similar anxiolytic profile to selank and longer half-life. Evidence strength is rated Preclinical — see the evidence section for detail.
How is NA-Selank dosed?
Commonly referenced dosing is 250 – 900 mcg per dose, typically daily, administered Intranasal. This is educational reference only; consult a licensed clinician before use.
What are the side effects of NA-Selank?
Commonly reported side effects include mild nasal irritation. This list is not exhaustive.
Is NA-Selank legal?
Placed on the FDA's 503A Category 2 list and cannot be lawfully compounded in the US. No brand pharmacy alternative exists. US buyers encounter only research-use-only (RUO) channels, which the FDA's Intended Use Doctrine treats as unapproved drug sales. FDA status: Not FDA-approved..

This site is for educational and research purposes only. It does not constitute medical advice. Always consult a qualified healthcare provider before using any peptide or supplement.