Semax vs Selank
Semax and Selank both come from Russian neuroscience research and are often mentioned in the same breath. They are analogues of two entirely different endogenous starting points.
| Semax | Selank | |
|---|---|---|
| Starting point | Analogue of ACTH(4-7) | Analogue of the tetrapeptide tuftsin |
| Structure | Heptapeptide | Heptapeptide |
| Mechanism studied | BDNF expression and neurotransmission | Immunomodulatory and anxiety-related signalling |
| Typical research context | Cognition, attention and neuroplasticity | Stress response and anxiety models |
| Origin | Developed in Russian research | Developed in Russian research |
What the difference means
Both are small, well-described peptides used as reference compounds in method development. They are studied in different models – Semax most often around cognition and plasticity, Selank around stress and immune signalling – and the literature treats them as related, not interchangeable.
Same research community, different molecules
Both come from Russian neuroscience research, and they are often mentioned together for that reason alone. Molecularly they have little in common: Semax is an analogue of ACTH(4-7), a fragment of adrenocorticotropic hormone, while Selank is built on tuftsin, a short immunoactive tetrapeptide.
The shared design idea is to take a short, endogenous fragment and make it more stable. It is the method that is similar, not the active compound.
Different lines of research
Semax is most often studied in connection with BDNF expression, neurotransmission and plasticity – that is, how nerve tissue adapts.
Selank follows a different track, with an emphasis on immunomodulation and anxiety-related signalling. Its tuftsin origin makes the immune link a natural one, and much of the work has been done in stress models.
They overlap in the sense that both touch on neuroendocrine signalling, but they answer different questions.
Why they are used as reference compounds
Both are small, well described and stable enough to be handled routinely. That makes them useful when a method needs to be calibrated or compared across set-ups.
Both are supplied lyophilised with batch documentation and a certificate of analysis, for research use only.
Frequently asked questions
Are Semax and Selank the same?
No. Semax is an analogue of ACTH(4-7); Selank is an analogue of tuftsin. They share a research community, not a molecule.
What is Semax studied for?
Most often BDNF expression, neurotransmission and neuroplasticity in preclinical models.
What is Selank studied for?
Immunomodulatory effects and anxiety-related signalling, in line with its tuftsin origin.
All material is sold exclusively for research purposes and laboratory use. This page gives no dosing, instructions for use or health claims. Read more about safety and regulation.