Research Compound Reference
Selank + Semax
This listing pairs two separately synthesized research peptides, Selank and Semax, each supplied as its own lyophilized powder for laboratory research use only. Selank is a heptapeptide derived from the endogenous tetrapeptide tuftsin; Semax is a heptapeptide based on a fragment of adrenocorticotropic hormone (ACTH 4-10) extended with a Pro-Gly-Pro tail.
Molecular profile of Selank + Semax| CAS Number | 129954-34-3 (Selank) · 80714-61-0 (Semax) |
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| Molecular Formula | C33H57N11O9 (Selank) · C37H51N9O10S (Semax) |
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| Molecular Weight | 751.9 g/mol (Selank) · 813.9 g/mol (Semax) |
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| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro (Selank) · Met-Glu-His-Phe-Pro-Gly-Pro (Semax) |
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| Purity | ≥99% by HPLC · COA available |
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| Physical Form | Lyophilized powder |
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What is Selank + Semax?
Selank (CAS 129954-34-3) is a synthetic heptapeptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, constructed by appending the Pro-Gly-Pro tripeptide to the endogenous immunomodulatory tetrapeptide tuftsin. Semax (CAS 80714-61-0) is a synthetic heptapeptide, Met-Glu-His-Phe-Pro-Gly-Pro, built on the ACTH(4-7) fragment with the same Pro-Gly-Pro extension. In both cases the Pro-Gly-Pro motif is described in the peptide-chemistry literature as a stabilizing element that slows enzymatic degradation relative to the parent fragment. The two are supplied as separate lyophilized vials rather than as a premixed solution. Neither compound is approved by the FDA, and both are supplied strictly as research chemicals. Detailed single-compound data are in the Selank and Semax monographs.
Reconstitution & handling
Each peptide is supplied as its own lyophilized vial and is handled separately; they are not premixed. For laboratory work both are typically dissolved in sterile water or a suitable aqueous buffer, with solubility established empirically for the buffer system in use. Where this listing is supplied with a spray applicator, the liquid in the applicator is the supplied reconstitution solution and the peptide remains in its own separate vial.
Storage & stability
Store both lyophilized powders at -20 C in sealed, desiccated containers protected from light. Peptide solutions are considerably less stable than the dry powders; aliquoting to avoid repeated freeze-thaw cycles is standard laboratory practice. Refer to each lot label for its expiration date.
How it's tested
Each peptide lot is characterized independently by reversed-phase HPLC for purity with identity confirmed by mass spectrometry, and each carries its own third-party Certificate of Analysis matched to the lot number printed on that vial's label.
Frequently asked questions
Are Selank and Semax premixed in this listing?
No. They are two separately synthesized peptides supplied as their own lyophilized vials. If the listing includes a spray applicator, the liquid already in the applicator is the supplied reconstitution solution — the peptides themselves remain in their own vials.
What are the sequences of Selank and Semax?
Selank is Thr-Lys-Pro-Arg-Pro-Gly-Pro (CAS 129954-34-3), a tuftsin analogue extended with Pro-Gly-Pro. Semax is Met-Glu-His-Phe-Pro-Gly-Pro (CAS 80714-61-0), based on the ACTH(4-7) fragment with the same Pro-Gly-Pro extension.
Why do both peptides end in Pro-Gly-Pro?
The Pro-Gly-Pro tripeptide is described in the peptide-chemistry literature as a stabilizing C-terminal motif that slows enzymatic degradation relative to the unextended parent fragment. It is a structural feature shared by both sequences.
Are Selank or Semax approved by the FDA?
No. Neither compound is approved by the FDA for any indication. Both are supplied strictly as research chemicals for laboratory use only.
How should they be stored?
Store both lyophilized powders at -20 C, sealed, desiccated, and protected from light, and aliquot solutions to avoid repeated freeze-thaw cycles.
Is a Certificate of Analysis available for each?
Yes. Each peptide is third-party tested independently by HPLC with identity confirmed by mass spectrometry, and each carries its own COA matched to the lot number on that vial.
Shop lot-tested Selank + Semax
Third-party tested to ≥99% purity, with analytical documentation available.
Related compounds
This reference describes the compound's chemistry and analytical properties for laboratory research use only. It is not medical advice; the product is not a drug, supplement, or cosmetic and is not for human or veterinary consumption.
