Semax vs Selank: How to Choose? Mechanisms and Research
Two neuroactive peptides often discussed together: one leans toward cognition, the other toward mood.
Comparison
Section titled “Comparison”| Semax | Selank | |
|---|---|---|
| Source | ACTH 4–10 | Tuftsin-derived |
| Mechanism | BDNF / NGF | GABAergic modulation |
| Subjective feel | Focus, cerebral blood flow | Relaxation, stress relief, non-sedating |
Combined Use
Section titled “Combined Use”The blend BRAIN20 is the combination of the two. For functional connectome research see PMID 32342318.
References
Section titled “References”| Reference | Takeaway |
|---|---|
| Functional connectome (PMID: 32342318) | Selank/Semax resting state |
| Behavioral study (PMID: 28702721) | Animal model |
Semax with BDNF/NGF, Selank with the GABAergic system; for combinations see BRAIN20. Scenarios: Brain Fog and Focus, Stress and Anxiety.
Related Reading
Section titled “Related Reading”Which One If Anxiety Dominates?
Section titled “Which One If Anxiety Dominates?”Selank leans GABA/mood, Semax leans BDNF/cognition; combination BRAIN20.
How to Keep Reading?
Section titled “How to Keep Reading?”Cross-use this page’s mechanisms with the Ingredient entries, Practical guides.
How Should Intranasal Dosing Be Read?
Section titled “How Should Intranasal Dosing Be Read?”Published intranasal protocols differ widely in dose and frequency, and formulation/concentration systems are not standardized, so they should not be transplanted between contexts. At the practical level, first understand the general principles of administration routes and reconstitution; individual regimens should follow professional guidance.
What Is the Evidence Level?
Section titled “What Is the Evidence Level?”Public sources are mainly resting-state fMRI (PMID: 32342318) and animal behavioral research (PMID: 28702721), which remain at a distance from subjective experience in healthy people. For basic terminology see the peptide glossary.
What It Is
Section titled “What It Is”The naming, structure, and source of this entry; INCI and spec codes are in the table.
How It Works in the Body
Section titled “How It Works in the Body”Receptor/pathway and tissue-level mechanisms; compare with related ingredients.
Common Application Scenarios
Section titled “Common Application Scenarios”Common physiological/skin/metabolic scenarios in research or use.
Methods and Evidence Details
Section titled “Methods and Evidence Details”Resting-state fMRI research (PMID: 32342318) shows Selank/Semax affect whole-brain functional connectivity; for animal behavior see PMID: 28702721. Intranasal doses and frequencies vary widely across studies and should not be transplanted between them.
Safety Boundaries and Limitations
Section titled “Safety Boundaries and Limitations”Human data on Semax / Selank mostly come from regional clinical use and small samples; international multicenter RCTs are limited. Interactions with central-acting drugs and contraindications such as epilepsy need professional evaluation. Functional connectome research cannot be directly extrapolated to “raise IQ”-style claims. This page is not medical advice; consult a licensed physician.
Practical workflow and quality control: before using or comparing an ingredient, see reconstitution, storage, COA, and administration routes; operating standards in Peptide Basics.