Semax vs Selank UK (2026): Differences, Research & Price

Semax vs Selank UK Research Guide · Written by Raquel Whatmough, Founder of MyPep Biotech · Updated October 2026 · Strictly for laboratory research use only

Semax and Selank are two short peptides developed at the same institute in Moscow, and they are often confused. This guide compares Semax vs Selank: what each one is, how they differ, what research has looked at, whether they are studied together, their UK legal status and the Semax and Selank price in the UK.

What Is the Difference Between Semax and Selank?

The short answer: Semax is based on a fragment of the hormone ACTH and is studied mainly for memory, focus and nerve protection. Selank is based on tuftsin, an immune peptide, and is studied mainly for anxiety, stress and calm. Both are seven amino acids long and share the same stabilising Pro-Gly-Pro ending.

	Semax	Selank
Based on	ACTH(4-7) fragment	Tuftsin, an immune peptide
Length	7 amino acids	7 amino acids
Main research areas	Memory, attention, BDNF, nerve protection	Anxiety, stress, mood, immune signalling
Research focus in a word	Focus	Calm
Developed	Institute of Molecular Genetics, Moscow
MyPep price	Vial £19.99 · Pen £64.99	Vial £29.99

What Is Semax?

Semax is a synthetic peptide built on the ACTH(4-7) fragment with three extra amino acids added for stability. Animal research has explored it in memory and learning tasks, in raising BDNF (a growth factor for nerve cells) and in models of reduced blood flow to the brain. Read our Semax UK guide.

What Is Selank?

Selank is a synthetic peptide built on tuftsin, a natural immune peptide, with the same stabilising ending as Semax. Research has explored Selank in anxiety and stress models, in GABA and serotonin signalling, and in immune messengers. Read our Selank UK guide.

Semax or Selank: Which Is Studied for Focus and Which for Calm?

In research terms, Semax is the focus and memory peptide, and Selank is the calm and stress peptide. Semax research centres on attention, learning and protecting nerve cells. Selank research centres on anxiety-like behaviour and mood, often without the sedation seen with older calming drugs in animal models.

Are Semax and Selank Studied Together?

Yes. Because they come from the same institute, share a structure and act on different systems, researchers often study them side by side to compare focus and calm pathways. Selank is also paired with Epitalon in our NeuroCalm™ blend pen (£79.99).

Semax vs Selank Price in the UK

Semax vial: £19.99
Semax 40mg pen: £64.99
Selank vial: £29.99
NeuroCalm™ Selank + Epitalon 20mg pen: £79.99

All are dispatched the same day before 2pm with tracked UK delivery, and orders over £75 ship free.

Are Semax and Selank Legal in the UK?

Neither Semax nor Selank is a licensed medicine in the UK. Both can be supplied for in-vitro and laboratory research only, and must not be sold for human use. MyPep Biotech does not provide dosing guidance for humans or animals.

How Should Semax and Selank Be Stored?

Store freeze-dried vials in the fridge at 2–8°C, away from light
Mix with sterile bacteriostatic water and keep mixed vials and pens refrigerated
Use our free peptide calculator to work out the concentration

Semax vs Selank: Frequently Asked Questions

Is Semax or Selank better?

Neither is better overall. Semax is studied mainly for focus, memory and nerve protection; Selank mainly for anxiety, stress and calm.

Are Semax and Selank the same?

No. They are different peptides with different starting points: Semax comes from ACTH, Selank from tuftsin. They share the same stabilising ending and were developed at the same institute.

Can Semax and Selank be researched together?

Yes. Researchers often compare them side by side because they act on different systems.

How much are Semax and Selank in the UK?

At MyPep Biotech, the Semax vial is £19.99, the Semax 40mg pen is £64.99 and the Selank vial is £29.99.

Do you give dosing advice?

No. Our products are for lab research only. We do not give dosing guidance for humans or animals.

What Is the Bottom Line on Semax vs Selank?

Semax and Selank are sister peptides from the same Moscow institute. Semax is the focus and memory peptide, Selank is the calm and stress peptide. In the UK both are research compounds only.

Strictly for laboratory research use only. Not for human or veterinary use. This guide is for educational purposes and is not medical advice.

About the author: Raquel Whatmough founded MyPep Biotech, a UK research peptide supplier. Our guides use published scientific studies. Each one is checked for accuracy and UK rules.

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Working out reconstitution? Use our peptide calculator to find the bacteriostatic water volume, concentration per ml and pen clicks for any vial or pen strength.

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