# Selank Nasal Spray

> Ready-mixed research solution of the tuftsin analogue Selank, 15 mL spray bottle

All products are sold strictly for laboratory research use only. Not for human or veterinary use.

- Web page: https://peptidemedixeu.com/en/products/selank-nasal-spray/
- Brand: Peptide Medix EU
- Category: [Nasal Peptide Sprays](https://peptidemedixeu.com/en/collections/nasal-peptide-sprays/)
- CAS number: 129954-34-3
- from €85 (EUR)

## Sizes and prices (EUR)

| Size | Price | SKU |
| --- | --- | --- |
| 15 mL · 10 mg | €85 | SELANK-NASAL-SPRAY-15-ML-10-MG |
| 15 mL · 20 mg | €140 | SELANK-NASAL-SPRAY-15-ML-20-MG |

_Catalog prices at build time; the web page and checkout are authoritative._

## Specifications

- **CAS number:** 129954-34-3
- **Molecular formula:** C33H57N11O9
- **Molecular weight:** 751.89 g/mol
- **Amino acid sequence:** Thr-Lys-Pro-Arg-Pro-Gly-Pro
- **Peptide class:** Synthetic tuftsin (Thr-Lys-Pro-Arg) analogue, heptapeptide
- **Form:** Pre-mixed aqueous solution, 15 mL bottle with metered spray pump
- **Available sizes:** 15 mL (10 mg total), 15 mL (20 mg total)
- **Concentration:** Approximately 0.67 mg/mL (10 mg fill) or 1.33 mg/mL (20 mg fill)
- **Purity (raw material):** ≥99% by HPLC; lot-matched COA available
- **Amino acid count:** 7 residues
- **Research areas:** GABAergic transmission, anxiolytic-type behavioural models, enkephalin-degrading enzyme activity, immune and stress-related gene expression
- **Reconstitution:** None required — supplied pre-mixed and ready to dispense
- **Storage:** 2–8 °C, upright, protected from light; do not freeze the filled bottle

## Description

This product contains the synthetic heptapeptide Selank (CAS 129954-34-3, Thr-Lys-Pro-Arg-Pro-Gly-Pro) as a ready-made aqueous solution in a 15 mL bottle with a metered pump. Selank takes tuftsin — Thr-Lys-Pro-Arg, the natural tetrapeptide cleaved from the heavy chain of immunoglobulin G — and adds Pro-Gly-Pro at the C-terminus. That proline-rich extension greatly slows exopeptidases, turning a very short-lived fragment into a stable peptide that is easy to synthesise for research.

The same 15 mL bottle is available in two strengths: 10 mg (about 0.67 mg/mL) or 20 mg (about 1.33 mg/mL). Since it arrives pre-formulated, labs running mucosal-delivery or format-comparison studies can start from a documented concentration without reconstituting powder, eliminating weighing and dilution errors from the protocol.

## Frequently asked questions

### What amount of Selank is in a bottle?

Either 10 mg (≈0.67 mg/mL) or 20 mg (≈1.33 mg/mL), both in the same 15 mL bottle. The concentration appears on the label and again on the lot's Certificate of Analysis.

### Has the peptide been tested independently, and is there a COA?

Yes. The Selank used here is analysed by an independent lab with HPLC to ≥99% purity and identity-confirmed by mass spectrometry; the lot COA is available. Check that the bottle's lot matches it before recording results.

### What is Selank chemically?

A synthetic seven-residue peptide — Thr-Lys-Pro-Arg-Pro-Gly-Pro, CAS 129954-34-3, C33H57N11O9, 751.89 g/mol — made by extending the immunomodulatory tetrapeptide tuftsin with Pro-Gly-Pro, which substantially delays enzymatic breakdown.

### How does its research use differ from Semax's?

Both are Pro-Gly-Pro-stabilised heptapeptides from Russian peptide chemistry, but their literatures go separate ways: Semax studies focus on BDNF, neurotrophins and attention models, Selank studies on GABAergic transmission, enkephalinase inhibition and stress-response markers.

### Is reconstitution needed?

No — it comes pre-mixed at a stated concentration, with no weighing, solvent or filtering. That is what sets it apart from the lyophilised Selank vial and why labs pick it for format-comparison studies.

### How should I store the bottle?

Upright in the fridge at 2–8 °C, protected from light, never frozen. Peptides in solution are less stable than powder, so keep the in-use period short and write the opening date next to the lot number on the label.

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All products offered on this website are intended solely for in-vitro laboratory research and development by qualified professionals. They are not drugs, foods, cosmetics or dietary supplements, and are not intended to diagnose, treat, cure or prevent any disease. Products must not be introduced into humans or animals in any manner. By purchasing, you confirm that you are a qualified researcher and accept full responsibility for handling and storage in accordance with applicable laws.

Peptide Medix EU · https://peptidemedixeu.com/en/products/selank-nasal-spray/