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Comparison · Cognitive & Nootropic

Selank vs Semax

Selank and Semax are the two Russian-registered nootropic peptides most referenced in Western research. Both are short peptides administered intranasally; both target BDNF-related signalling. Their distinct personality: Selank leans anxiolytic, Semax leans activating.

Bangkok research desk ·

Side-by-side

Selank Semax
MechanismTuftsin analog; anxiolytic via enkephalin and GABAergic modulation.ACTH(4-10) analog; elevates BDNF and modulates monoaminergic tone.
Half-lifeShort (intranasal).Short (intranasal).
Dose250-500 mcg × 2 daily intranasal.250-500 mcg × 2-3 daily intranasal.
Cycle14 days on / 14 off.14 days on / 14 off.
Research contextAnxiolytic; modulates hippocampal transcriptome1.BDNF and NGF elevation; stroke-recovery indication in Russian registration2.
Cost tierLow-to-mid.Low-to-mid.

Selank and Semax are often compared because they are the two short peptide nootropics most studied in the Russian biomedical literature and most available as research compounds in the West. Both are administered intranasally, both modulate BDNF-related pathways, and both are frequently stacked. The common mistake is assuming they do the same thing.

Selank is a tuftsin analog. Its pharmacology leans toward anxiolytic and stress-resilience activity via GABAergic and enkephalinergic modulation1. Research subjects describe reduced anxiety without sedation. Semax is an ACTH(4-10) analog. Its pharmacology leans toward activating and focus-enhancing effects, driven by BDNF and NGF elevation plus monoaminergic modulation2. Semax is registered in Russia for stroke recovery and attention-related indications.

The common stack pairs the two: Selank in the morning for calm alertness, Semax for focus-demanding tasks. The evidence for the stack is mechanistic (complementary rather than overlapping pathways) rather than trial-derived. Research protocols typically use 14-day on / 14-day off cycling for both compounds, consistent with the original Russian research tradition.

See the Semax and Selank BDNF deep-dive for the mechanistic pathway detail and nootropic peptide mechanisms for the broader class map.

Frequently asked

Are Selank and Semax interchangeable?
No. Selank is anxiolytic; Semax is activating. They target different aspects of cognitive function and are more often stacked than substituted.
Why intranasal instead of subcutaneous?
Both peptides have poor oral bioavailability, and intranasal administration provides direct CNS access via the olfactory pathway. Subcutaneous works but the intranasal route is what the Russian literature established.
Is the stack evidence-based?
The mechanistic rationale is clean. Direct clinical trials of the combined stack are limited. Most Western stack use is extrapolated from separate single-compound Russian studies.
Research desk
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References

  1. Kolomin T, et al. Transcriptomic response of rat hippocampus and spleen cells to single administration of Selank. Dokl Biochem Biophys. 2010. PMID: 20380151
  2. Dolotov OV, et al. Semax, an analogue of adrenocorticotropin (4-10), binds specifically and increases levels of brain-derived neurotrophic factor. J Neurochem. 2006. PMID: 16635254

All references verified against PubMed via NCBI E-utilities.