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005printed on this vialLot SXSK-042026-199.21% purity by HPLC · assayed Apr 22, 2026Verify →
Shop / Selank / Semax
selank / semax
Cognitive peptides
Selank / Semax is a research pairing of two synthetic heptapeptides. Selank (Thr-Lys-Pro-Arg-Pro-Gly-Pro) is a tuftsin-derived heptapeptide — the endogenous tetrapeptide Thr-Lys-Pro-Arg extended with a Pro-Gly-Pro tail for enzymatic stability — while Semax (Met-Glu-His-Phe-Pro-Gly-Pro) corresponds to the ACTH(4-7) fragment of adrenocorticotropic hormone, likewise capped with a C-terminal Pro-Gly-Pro tripeptide. In published preclinical and animal-model literature these peptides have been investigated for their interactions with neuropeptide and neurotrophin signaling pathways. Supplied as two lyophilized components at ≥99% HPLC purity with a per-lot Certificate of Analysis. For laboratory and research use only — not for human or animal consumption. ROEHN makes no claims regarding its effects.
1
Free cold-chain shipping over $150 · independent LC-MS/MS testing · signed COA
RUO — For research use only. Not for human or animal consumption.
Two synthetic heptapeptides paired for NEUROPEPTIDE research.
Compound
Research pairing — Selank + Semax (two synthetic heptapeptides)
CAS number (Selank)
129954-34-3
CAS number (Semax)
80714-61-0
Molecular formula (Selank)
C₃₃H₅₇N₁₁O₉
Molecular formula (Semax)
C₃₇H₅₁N₉O₁₀S
Molecular weight (Selank)
751.9 g/mol
Molecular weight (Semax)
813.9 g/mol
Sequence (Selank)
Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP)
Sequence (Semax)
Met-Glu-His-Phe-Pro-Gly-Pro (MEHFPGP)
PubChem CID (Selank)
11765600
PubChem CID (Semax)
9811102
Purity
≥99% by reverse-phase HPLC
Identity
Confirmed by mass spectrometry (ESI-MS)
Form
Lyophilized powder (two components)
Testing
Independent HPLC-UV + LC-MS/MS — Freedom Diagnostics
Research use
Laboratory research only — not for human or animal consumption
Made with
selank · semax
lyophilized
Application
Reconstitute with bacteriostatic water per your research protocol.
Members
Laboratory handling
Reconstitution, storage & aseptic handling guidance for Selank / Semax — reagent preparation notes for the lab bench.
Sign in to viewAssayed results — lot SXSK-042026-1
99.21%
Purity by HPLC, as assayed by Freedom Diagnostics
Selank 5.35 mg · Semax 6.47 mg
Net peptide content recovered per vial
Pass
Bacterial endotoxin verdict — USP <85>
Apr 22, 2026
Date assayed · accession 2604200571
Figures are this lot's own assayed results, reproduced from the signed certificate as Freedom Diagnostics reported them. Analytical results only — they describe the material, not any physiological outcome. Research use only.
verified, not promised.
Enter the lot code from your roehn vial to pull its Certificate of Analysis: independent purity and identity results, published exactly as the lab reported them. Lots still in testing say so. Research use only.
View lot SXSK-042026-1 certificate →customer reviews
5.0
from 1 review
Ratings are 1–5. Reviews appear as written, after moderation for spam and off-topic content. They describe ordering, packaging and service — not any physiological outcome.
