Semax vs Selank
Semax and Selank are the two best-known Russian nootropic peptides, and they are often described as opposites: Semax leans stimulating and focus-oriented, while Selank leans calming and anxiolytic.
| Semax | Selank | |
|---|---|---|
| Compound class | ACTH(4-10) heptapeptide analog | Tuftsin-analog heptapeptide |
| Primary target | BDNF / neurotrophic signaling | GABA / immune modulation |
| Category | Cognitive & Nootropic | Cognitive & Nootropic |
| Administration | Intranasal or subcutaneous | Intranasal or subcutaneous |
| Research focus | Focus, memory & neuroprotection | Anxiolytic / calm & immune research |
Key differences
- Mechanism: Semax (an ACTH(4-10) analog) is linked to BDNF and neurotrophic signaling; Selank (a tuftsin analog) is linked to GABAergic and immune modulation.
- Subjective direction: Semax is studied for focus, drive, and neuroprotection; Selank for calm and anxiety reduction.
- Pairing: because their directions differ, they are sometimes combined to balance focus with calm.
- Both are typically used intranasally (and can be injected) and dosed daily.
Which is right for your research?
Semax is the focus/stimulating nootropic; Selank is the calm/anxiolytic one. They are often stacked precisely because they pull in opposite directions.
Frequently asked questions
What is the difference between Semax and Selank?
Semax is a stimulating, focus-oriented nootropic linked to BDNF signaling, while Selank is a calming, anxiolytic peptide linked to GABAergic and immune effects.
Can Semax and Selank be used together?
Yes — because they pull in different directions (focus vs calm), they are sometimes combined and are even offered as a blend.
How are they administered?
Both are typically used intranasally, though they can also be injected, and are dosed daily.
For Research Use Only. All products are sold as research chemicals for in-vitro laboratory study. Not for human consumption, medical, veterinary, or household use.