Selank vs Semax: Complete 2026 Comparison
Side-by-side comparison of Selank and Semax: mechanism, common use cases, dosing protocols from named experts, vendor availability, and expert opinion. Both are framed as research compounds.
TL;DR Table
| Factor | Selank | Semax |
|---|---|---|
| Class | PEPTIDE | PEPTIDE |
| Aliases | ["Thr-Lys-Pro-Arg-Pro-Gly-Pro", "N-acetyl Selank"] | ["Met-Glu-His-Phe-Pro-Gly-Pro", "Russian nootropic"] |
| Mechanism | GABA-A receptor modulator (anxiolytic), enkephalinase inhibitor (extends endorphin action), BDNF upregulator. | Upregulates BDNF expression in hippocampus/cortex. Also modulates dopaminergic and serotonergic systems. |
| What it's researched for | Reduces anxiety without sedation; also increases BDNF (cognitive benefit). Tanner says he didn't know about the BDNF angle until this conversation - that... | Increases BDNF (brain-derived neurotrophic factor), sharpens focus, improves mood, reduces anxiety-driven cognitive suppression. Tanner pairs it with Selank. |
| Dosing mentions tracked | 7 | 14 |
| Vendor recs tracked | 1 | 4 |
| PubMed papers | 8 | 8 |
Mechanism Comparison
Selank
GABA-A receptor modulator (anxiolytic), enkephalinase inhibitor (extends endorphin action), BDNF upregulator.
Semax
Upregulates BDNF expression in hippocampus/cortex. Also modulates dopaminergic and serotonergic systems.
What Each is Researched For
Selank research areas
Reduces anxiety without sedation; also increases BDNF (cognitive benefit). Tanner says he didn't know about the BDNF angle until this conversation - that makes it a dual-action peptide for mood + cognition.
Semax research areas
Increases BDNF (brain-derived neurotrophic factor), sharpens focus, improves mood, reduces anxiety-driven cognitive suppression. Tanner pairs it with Selank.
Dosing Mention Comparison
Selank dosing
- Speaker 1: Anecdotal reports indicate users stack Selank with Semax, reporting feelings of calm and focus during high-pressure performance. (00:10:31)
- Speaker 1: Nasal spray reported as the primary administration route in described protocols, with systemic absorption and brain-targeting effects. (00:11:00)
- host: The host reported using the following protocol: 300 micrograms intranasally split across morning and early afternoon for 14 days (150... (00:13:57)
- Vigorous Steve / Steve: Vigorous Steve reported using Selank in the afternoon to ease back and relax; dose not specified. (00:23:52)
- Will: Stack suggestion: PE-22-28 + Semax in the morning, Pinealon midday, Selank and DSIP at night. (00:33:37)
Semax dosing
- Speaker 1: Intranasal delivery; Speaker 1 reported typical doses of 200 to 900 micrograms per day in divided doses. (00:07:26)
- Speaker 1: Mentioned as a stack with Selank for calm focus under pressure. (00:10:31)
- host: Users report administering one to two drops per nostril with head tilted slightly back, allowing absorption rather than drainage into... (00:13:25)
- DrJones: DrJones reported using Semax regularly for perceived cognitive support and prevention of cognitive decline (anecdotal) (00:13:52)
- Vigorous Steve / Steve: 500 mcg intranasal Semax in the morning after a Cerebrolysin course (per Vigorous Steve) (00:23:39)
Side Effect Notes
Anecdotal reports for both compounds vary by route, dose, and individual. Neither should be treated as an approved medication. Consult a qualified clinician.
When To Choose Which
Comparison depends on research question, available source quality, and individual risk tolerance. See the full profiles for Selank and Semax for context-specific details.
Can You Stack Them?
Stacking decisions should be evaluated by qualified professionals with attention to dose attribution, source quality, and outcome tracking. This page is a research aggregator and does not recommend stacking protocols.
FAQ
Which has more research?
Selank has 8 PubMed citations indexed; Semax has 8.
Which has more vendor coverage?
Selank: 1 tracked vendor recommendations. Semax: 4.
Are they approved drugs?
Both are framed on this site as research compounds. Verify current FDA status and state-specific rules before any decision.