Research compound comparison · research use
Semax vs Selank: two nasal neuropeptides, two different jobs.
Semax and Selank get compared constantly because they look alike on the shelf — both are short heptapeptides, both ship as intranasal research sprays. But they descend from completely different parent molecules: Semax from the ACTH(4-10) melanocortin fragment, Selank from the immunopeptide tuftsin. In the literature, Semax indexes to cognition and neuroprotection while Selank indexes to anxiolytic and immune signaling — which is exactly why they're studied as a complementary stack rather than as substitutes. This page lays out what each is, why the stack exists, and the documentation standard behind both.
| Attribute | Semax | Selank |
|---|---|---|
| Origin | Synthetic analog of the ACTH(4-10) fragment (melanocortin family) | Synthetic analog of the immunopeptide tuftsin |
| Peptide length | Heptapeptide (Pro-Gly-Pro extended) | Heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) |
| Literature domain | Studied in neuroprotection, BDNF-expression and cognition research | Studied in anxiolytic, GABAergic and immunomodulation research |
| Why they're stacked | Cognition/neurotrophic signaling pathway | Anxiolytic/calming pathway — different mechanism, so studied together |
| Titan format | Semax Nasal Spray (intranasal, metered) | Selank Nasal Spray (intranasal, metered) |
| Documentation | Lot-matched release sheet, HPLC purity target | Lot-matched release sheet, HPLC purity target |
Different parent molecules, not two versions of one thing
Semax is a synthetic analog of the ACTH(4-10) fragment from the melanocortin family, while Selank is a synthetic analog of the immune-system peptide tuftsin. They share the short-heptapeptide, intranasal-research format, but they descend from entirely different parent molecules — which is the root reason their research literatures point in different directions.
View Semax spray →Semax indexes to cognition; Selank indexes to calm
In the published research literature, Semax is most often referenced in neuroprotection, BDNF-expression and attention/cognition studies, whereas Selank appears in anxiolytic and GABAergic signaling work alongside immunomodulation. If your reading is built around neurotrophic or cognitive endpoints, Semax is the relevant compound; if it is built around anxiolytic pathways, Selank is.
View Selank spray →Why researchers study them as a stack
Because the two engage separate mechanisms, the literature frequently treats them as complementary rather than interchangeable — one indexed to cognition, the other to anxiolytic signaling. That is why Titan stocks a Selank + Semax stack alongside the individual sprays, rather than presenting one as a substitute for the other.
View the stack →Same documentation standard on both
Whichever you read on, the paper-trail is identical: a lot-matched in-house release sheet referenced to the code on the vial, against an HPLC purity target with identity confirmation. Avoid suppliers that blur the two compounds with dosing or human-use claims — that language is a red flag, not a spec.
How to verify a COA →Related reading
Keep comparing before you commit.
Read the literature on both, then choose by pathway.
Open either nasal-spray product page for size, lot documentation, and checkout, or take the stack if your design references both compounds.
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Each Titan comparison breaks down the structural differences, research format, and documentation a buyer should confirm — lot-matched COA, HPLC purity target, and a clear research-use boundary. Pick the pair you're evaluating.
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