Semax/Selank Blend vs N-Acetyl-Selank
Side-by-side comparison of Semax/Selank Blend and N-Acetyl-Selank: mechanism, half-life, dose range, safety profile, and vendor pricing.
Price snapshot
Semax/Selank Blend
N-Acetyl-Selank
Semax/Selank Blend
Combined nootropic and anxiolytic peptide blend
Lowest listed price: $74.99 across 3 listings
Full Semax/Selank Blend profileN-Acetyl-Selank
N-Acetyl-Selank is the N-terminally acetylated analog of Selank, a tuftsin-derived heptapeptide used intranasally for its reported anxiolytic and nootropic effects. The acetyl group is claimed to improve stability and…
Lowest listed price: $79.99 across 2 listings
Full N-Acetyl-Selank profileSide-by-side comparison
| Attribute | Semax/Selank Blend | N-Acetyl-Selank |
|---|---|---|
| Category | Nootropics | Cognitive |
| Research Stage | Preclinical (no trials on the blend; components studied separately, mostly in Russia) | Preclinical (the N-acetyl analog has no dedicated studies); parent Selank has limited clinical use in Russia |
| Mechanism of Action | The Semax/Selank blend combines two synthetic Russian-developed regulatory heptapeptides, dosed together (usually intranasally) to pair an activating, pro-cognitive peptide with a calming, anxiolytic one. Because the blend itself has never been studied, its… | N-Acetyl-Selank is the N-terminally acetylated analog of Selank, a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) derived from the endogenous immunopeptide tuftsin (Thr-Lys-Pro-Arg) with a C-terminal Pro-Gly-Pro tail added to slow enzymatic breakdown.… |
| Half-Life | Both component peptides have short plasma half-lives (on the order of minutes) but a prolonged duration of central action, attributed to the protective C-terminal Pro-Gly-Pro sequence they share. Blend-specific pharmacokinetics have not been characterized. | Not established for the N-acetyl analog. Parent Selank has a very short plasma half-life (on the order of minutes, as expected for a small peptide) but produces behavioral effects lasting hours, attributed to active fragments and downstream enkephalin/GABA modulation. N-acetylation is claimed to slow N-terminal degradation and extend duration, but this is unquantified in published literature. |
| Typical Dose Range | Semax ~250-600 mcg + Selank ~250-300 mcg per day, intranasal (community-reported; no established blend dose) | 100-900 mcg |
| Dosing Frequency | Once or twice daily, intranasal (community practice; no validated schedule for the blend) | Once or twice daily (intranasal); some advanced users split into 2-3 doses |
| Administration | — | — |
| Side Effects | Reported side effects are drawn from single-component use, since the blend itself has not been studied. Intranasal administration can cause nasal or throat irritation and mild headache. The Semax component may, at higher doses, cause over-stimulation,… | In short Russian clinical trials, parent Selank was generally well tolerated with no serious adverse effects reported [PMID:18454096]. Reported or plausible effects (largely extrapolated to the analog): mild nasal irritation or congestion from the spray,… |
| Molecular Weight | — | ~793.9 g/mol (theoretical: Selank ~751.9 g/mol + N-terminal acetyl, ~+42). Approximate molecular formula C35H59N11O10. |
| Common Vial Sizes | — | — |
Price History
2 data points- Half Nattys
- Disguised Alpha
Price tracking
Semax/Selank Blend: potential benefits
- Focus, clarity, and verbal fluency attributed to the Semax component (linked to BDNF/TrkB neurotrophic signaling in preclinical studies)
- Calming, anti-anxiety effects attributed to the Selank component (a GABA-modulating, anxiolytic peptide in animal and limited clinical studies)
- 'Calm focus' - the community rationale of pairing an activating peptide with an anxiolytic one to get drive without jitters
- Anecdotal stress resilience and mood support
- Reported memory and learning support (component-level preclinical signals only; not demonstrated for the blend)
N-Acetyl-Selank: potential benefits
- Anxiolytic (calming) effects - the most-studied action of parent Selank, including a Russian clinical trial in generalized anxiety disorder [PMID:18454096]
- Nootropic / cognitive support - reported attention and memory benefits in rodent models, linked to BDNF changes [PMID:31625062]
- Stress resilience reported without the sedation, tolerance, or dependence typically seen with benzodiazepines (preclinical framing) [PMID:30255741]
- Possible support during withdrawal states (alcohol, opioid) in animal models [PMID:24913576][PMID:36322304]
- Claimed longer duration vs. plain Selank from N-terminal acetylation - a community/vendor claim not verified in published data
Frequently asked
What's the difference between Semax/Selank Blend and N-Acetyl-Selank?
Semax/Selank Blend is a nootropics that the semax/selank blend combines two synthetic russian-developed regulatory heptapeptides, dosed together (usually intranasally) to pair an activating, pro-cognitive peptide with a…. N-Acetyl-Selank is a cognitive that n-acetyl-selank is the n-terminally acetylated analog of selank, a synthetic heptapeptide (thr-lys-pro-arg-pro-gly-pro) derived from the endogenous immunopeptide tuftsin…. The two differ in mechanism, half-life (Both component peptides have short plasma half-lives (on the order of minutes) but a prolonged duration of central action, attributed to the protective C-terminal Pro-Gly-Pro sequence they share. Blend-specific pharmacokinetics have not been characterized. vs Not established for the N-acetyl analog. Parent Selank has a very short plasma half-life (on the order of minutes, as expected for a small peptide) but produces behavioral effects lasting hours, attributed to active fragments and downstream enkephalin/GABA modulation. N-acetylation is claimed to slow N-terminal degradation and extend duration, but this is unquantified in published literature.), and typical dose range.
Which has the longer half-life, Semax/Selank Blend or N-Acetyl-Selank?
Semax/Selank Blend has a half-life of Both component peptides have short plasma half-lives (on the order of minutes) but a prolonged duration of central action, attributed to the protective C-terminal Pro-Gly-Pro sequence they share. Blend-specific pharmacokinetics have not been characterized.. N-Acetyl-Selank has a half-life of Not established for the N-acetyl analog. Parent Selank has a very short plasma half-life (on the order of minutes, as expected for a small peptide) but produces behavioral effects lasting hours, attributed to active fragments and downstream enkephalin/GABA modulation. N-acetylation is claimed to slow N-terminal degradation and extend duration, but this is unquantified in published literature.. Longer half-lives generally mean less frequent dosing but slower on/off kinetics.
Which is cheaper, Semax/Selank Blend or N-Acetyl-Selank?
Lowest listed price on BodyHackGuide: Semax/Selank Blend from $74.99, N-Acetyl-Selank from $79.99. Prices are pulled from the vendor listings tracked on BHG and change frequently. See the compare tables on each compound page for the current set of offers.
Can you stack Semax/Selank Blend and N-Acetyl-Selank?
Stacking depends on mechanism overlap, safety profile, and goals. Semax/Selank Blend and N-Acetyl-Selank should only be stacked after reviewing each compound's individual protocol page, side effect profile, and any published interaction data. Use the BodyHackGuide stack builder for a structured review before combining research compounds.
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