# Semax + Selank

> Semax and Selank co-lyophilised together in one sealed vial

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

- Web page: https://peptidemedixeu.com/en/products/semax-selank/
- Brand: Peptide Medix EU
- Category: [Cognitive Blends](https://peptidemedixeu.com/en/collections/cognitive-blends/)
- Purity: ≥99% by HPLC per component; lot-matched COA
- from €72 (EUR)

## Sizes and prices (EUR)

| Size | Price | SKU |
| --- | --- | --- |
| 10 mg · (5/5) | €72 | SEMAX-SELANK-10-MG-5-5 |
| 20 mg · (10/10) | €127 | SEMAX-SELANK-20-MG-10-10 |

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

## Specifications

- **Peptide class:** Synthetic heptapeptides — ACTH(4–10) analogue and tuftsin analogue
- **Form:** Co-lyophilized white powder, sealed glass vial
- **Purity:** ≥99% by HPLC per component; lot-matched COA
- **Available sizes:** 10 mg total (5 mg Semax / 5 mg Selank), 20 mg total (10 mg / 10 mg)
- **Storage (lyophilized):** −20 °C, sealed, protected from light and moisture
- **Storage (reconstituted):** 2–8 °C, protected from light, used within the study window
- **Blend ratio:** 1:1 Semax to Selank by mass
- **CAS numbers:** Semax 80714-61-0; Selank 129954-34-3
- **Molecular formulas:** Semax C37H51N9O10S; Selank C33H57N11O9
- **Molecular weights:** Semax 813.93 g/mol; Selank 751.89 g/mol
- **Semax sequence:** Met-Glu-His-Phe-Pro-Gly-Pro
- **Selank sequence:** Thr-Lys-Pro-Arg-Pro-Gly-Pro
- **Research areas:** Cognition and attention models, BDNF and neurotrophin expression, GABAergic and anxiolytic research, stress-response gene expression

## Description

This vial contains two heptapeptides developed in Russia, freeze-dried together. Semax (Met-Glu-His-Phe-Pro-Gly-Pro, CAS 80714-61-0) is a lab-made version of the ACTH(4–10) fragment; the Pro-Gly-Pro extension at its end removes the parent hormone's action on the adrenal glands and makes it far more resistant to enzymes. Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro, CAS 129954-34-3) follows the same recipe starting from tuftsin, a tetrapeptide the body uses to regulate immunity, and is stabilised by the same Pro-Gly-Pro tail. Both were designed as short molecules that are simple to make and aren't broken down quickly in plasma.

The powder is white, sterile-filtered and freeze-dried in a sealed vial, with the two peptides in equal amounts (1:1): 5 mg of each in the 10 mg size, 10 mg of each in the 20 mg size. An independent laboratory tests every lot by HPLC to ≥99% purity, and each lot has its own Certificate of Analysis. Peptide Medix EU gives no information on dosing, protocols or administration.

## Frequently asked questions

### What does each vial contain?

Semax and Selank, freeze-dried together in equal parts: the smaller vial (10 mg) has 5 mg of each peptide, the larger (20 mg) has 10 mg of each. Because they form one solid cake, the ratio is set when the vial is made and can't be changed after you dissolve it.

### Are both peptides tested independently, and is there a COA?

Yes. For both components, every lot is analysed by an independent laboratory using HPLC to ≥99% purity with identity confirmed by mass spectrometry, and the lot COA is available. Compare the vial's lot number with the COA before logging data.

### What distinguishes Semax from Selank?

Semax comes from ACTH(4–10) and is researched mostly in models involving BDNF, other neurotrophins and attention. Selank comes from tuftsin and is researched in models of GABA and enkephalin signalling and of the stress response. They share the stabilising Pro-Gly-Pro end but very little of their mechanistic literature.

### Which solvent should be used?

Bacteriostatic water is the usual lab choice — both heptapeptides dissolve freely in water. Run the solvent gently along the glass and swirl rather than shake, and check the lot COA for any batch-specific solvent notes.

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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/semax-selank/