Selank & Semax: The Cognitive Enhancement Peptides

Selank and Semax are two of the most well-studied nootropic peptides, both developed at the Institute of Molecular Genetics of the Russian Academy of Sciences. They work through distinct but complementary mechanisms to enhance cognitive function.

Selank: The Anxiolytic Nootropic

Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a synthetic analogue of the immunomodulatory peptide Tuftsin.

Mechanisms:

• •Modulates GABA-A receptor activity (anxiolytic effect)
• •Increases BDNF (Brain-Derived Neurotrophic Factor) expression
• •Stabilizes enkephalins (natural mood regulators)
• •Anti-inflammatory effects in the brain

Research Shows:

• •Reduced anxiety without sedation or cognitive impairment
• •Improved learning and memory in stress conditions
• •Enhanced emotional resilience
• •Immune system modulation

Semax: The Cognitive Enhancer

Semax (Met-Glu-His-Phe-Pro-Gly-Pro) is a synthetic analogue of ACTH (adrenocorticotropic hormone) fragment 4-10.

Mechanisms:

• •Increases BDNF and NGF (Nerve Growth Factor) in the brain
• •Modulates dopaminergic and serotonergic systems
• •Enhances neuroplasticity
• •Neuroprotective effects

Research Shows:

• •Improved attention, memory, and learning capacity
• •Enhanced cognitive performance under stress
• •Neuroprotection in stroke models
• •Improved recovery from brain injuries

The Selank + Semax Stack

These two peptides are frequently combined in a peptide stack:

• •Selank addresses anxiety and emotional regulation
• •Semax boosts cognitive performance and focus
• •Together, they provide calm, focused cognitive enhancement

Peptidrop's peptide database includes both peptides with detailed mechanism data and synergy analysis for cognitive optimization protocols. For another powerful cognitive peptide, see our guide on Dihexa.

For peer-reviewed research on these neuropeptides, see PubMed. Both peptides were developed at the Russian Academy of Medical Sciences, with decades of clinical research supporting their safety and efficacy profiles.