Selank research: overview and resources
What Selank research material is, how it is characterized, and where to find every specification, method, lot record and reference Selank Labs publishes about it.
What is Selank?
Selank is a synthetic seven-residue peptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro. Its first four residues reproduce tuftsin (Thr-Lys-Pro-Arg), a short peptide fragment of the immunoglobulin G heavy chain, and the C-terminal Pro-Gly-Pro extension was added to make the sequence more resistant to peptidase cleavage. Three of its seven residues are proline, which gives the molecule a rigid, extended backbone, and its two basic residues (lysine and arginine) make it strongly cationic at neutral pH.
Selank Labs supplies Selank as a lyophilized powder in 10 mg vials. Each lot is tested by an independent laboratory for HPLC-UV purity, LC-MS identity and net content, and the full certificate is published here before the material is sold through Klow.bio.
What is Selank research material?
Selank research material is Selank supplied for laboratory research (C33H57N11O9, 751.87 g/mol) in white lyophilized powder form, sold by lot. Each lot's identity, purity and net content are documented by an independent laboratory in a published certificate of analysis.
How is Selank characterized?
Three questions are answered for every lot, each by a different method:
- Is it the right compound? LC-MS separates the sample and measures the mass of the main component, confirming it has the molecular weight expected for the compound.
- How much of the sample is that compound? HPLC-UV reports the main peak's share of detected peak area. Current lots: 99.77%.
- How much peptide is in the vial? Net content is measured directly.
Endotoxin (LAL) and microbial DNA (PCR) results are added where those tests are run.
What has not been established
A certificate of analysis describes the specific sample tested on its test date. It does not establish stability afterward, sequence order beyond what mass confirmation shows, results for other lots, or suitability for any particular purpose.
Selank at a glance
- Product
- Selank
- Type
- Synthetic heptapeptide, 7 residues
- Also known as
- Thr-Lys-Pro-Arg-Pro-Gly-Pro, TKPRPGP
- CAS number
- 129954-34-3
- Molecular formula
- C33H57N11O9
- Molecular weight
- 751.87 g/mol (average)
- Form
- White lyophilized powder
- Vial sizes
- 10 mg
- Purity, current lots
- 99.77% (HPLC-UV)
- Purity specification
- ≥95%
- Identity
- Confirmed by LC-MS on every lot
- Testing laboratory
- Freedom Diagnostics (independent)
- Current lot
- KB55627, reported May 5, 2026
- Operated by
- Klow Labs LLC, Chicago, IL
- Where to order
- klow.bio
Selank research resources
Every Selank resource on selank.bio, organized from chemistry to documentation.
Selank specifications
Formula, molecular weight, sequence, modifications and release specification.
QualityQuality and supply chain
Sourcing, specifications, batch documentation and release.
TestingAnalytical testing
How every lot is tested, reviewed and released.
TestingHPLC analysis of Selank
Retention time, peaks, area normalization and results by lot.
DocumentationCertificates of analysis
Every lot's full results, plus the complete testing records.
DocumentationHow to read a Selank COA
What each section means and what a COA does and doesn't establish.
DocumentationVerify a lot
Look up any Selank lot by the number on the vial.
AnalysisPurity, content and net content
Three different numbers, kept apart.
HandlingStorage and stability
Degradation pathways and lyophilized peptide handling.
ReferenceGlossary
Definitions for every term on a Selank certificate.
Research materialSelank research material
Sizes, current lots and availability. Purchasing is handled through Klow.bio.
Research references
Published sources
- PubChem: Selank. National Library of Medicine, NIH. pubchem.ncbi.nlm.nih.gov/compound/Selank
- PubChem: Tuftsin. National Library of Medicine, NIH. pubchem.ncbi.nlm.nih.gov/compound/Tuftsin
- Wilm M. Principles of electrospray ionization. Mol Cell Proteomics. 2011. PMC3134074. pmc.ncbi.nlm.nih.gov/articles/PMC3134074
- U.S. FDA. Q2(R2) Validation of Analytical Procedures. 2024. fda.gov
- U.S. FDA. Pyrogen and Endotoxins Testing: Questions and Answers. Revised 2026. fda.gov
Selank Labs analytical documentation
- Lot KB55627: 10 mg, 99.77% purity, reported May 5, 2026
- Selank testing records (all tests, all lots; CSV available)
Editorial scope
Selank Labs research content covers molecular characteristics, peptide structure, analytical chemistry, purity and identity testing, certificates of analysis, lot documentation and laboratory storage and handling.
It does not cover dosing, administration instructions, protocols, personal use or medical advice.
Latest updates
Buy Selank
10 mg vials. Current lot KB55627 tested at 99.77% purity with identity confirmed by LC-MS. Current purchasing is available through Klow.bio.