What are Semax and Selank? A Nootropic Peptide Breakdown
Compound Spotlight
Semax and Selank are two peptides developed in Russia decades ago, both studied extensively for their effects on the central nervous system, and both now common reference points in nootropic peptide research.
Quick summary
- Two separate Russian-developed peptides, often discussed together but with different mechanisms.
- Semax is derived from ACTH and studied mainly for cognitive and neuroprotective research.
- Selank is a tuftsin analog studied mainly for anxiolytic and stress-response research.
- Both have research histories dating back to the 1980s at the same Russian research institute.
What are Semax and Selank?
Semax is a synthetic peptide derived from a fragment of adrenocorticotropic hormone (ACTH), developed in the Soviet Union and studied since the 1980s. Selank is a synthetic analog of tuftsin, an immunomodulatory peptide, developed by the same Russian research institute. Both are studied for central nervous system effects, though through different mechanisms.
What it is studied for
- Cognitive function and memory research (Semax)
- Neuroprotective pathway studies (Semax)
- Anxiolytic and stress-response research (Selank)
- Immune-neurological interaction studies (Selank)
How it is thought to work
Semax is studied for its effect on brain-derived neurotrophic factor (BDNF) expression, a protein linked to neuron growth and survival, which is part of why it is researched in the context of cognitive function. Selank is studied for its modulation of the immune system alongside effects on GABA and serotonin pathways, which is why it is more frequently associated with stress-response and anxiolytic research rather than cognition specifically.
Research history
Semax and Selank were both developed at the Institute of Molecular Genetics of the Russian Academy of Sciences, beginning in the 1980s. Semax was derived from a fragment of adrenocorticotropic hormone (ACTH), studied initially for its effects on the central nervous system distinct from the hormone-regulating role of the full ACTH molecule.
Selank was developed somewhat later as a synthetic analog of tuftsin, a naturally occurring immunomodulatory peptide. Because tuftsin itself is broken down quickly in the body, Selank was engineered for greater stability while retaining research interest in tuftsin’s immune and neurological effects, which is part of why Selank research spans both immune modulation and stress-response pathways.
Our Semax and Selank
Every lot we sell is sent to an independent, third-party lab before it is listed, and the resulting Certificate of Analysis is published for that exact lot, confirming identity and purity.
For laboratory and research use only. Not for human consumption. This article is for informational purposes and summarizes existing published research; it is not medical advice.
Frequently asked questions
Are Semax and Selank the same compound?
No. They are separate peptides with different origins and mechanisms. Semax is derived from ACTH and studied primarily for cognitive research, while Selank is a tuftsin analog studied primarily for stress-response research.
How do I know what is actually in the vial?
Every lot we sell has a published Certificate of Analysis from an independent, third-party lab, confirming both identity and purity. You can look up any lot number directly on our site.
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