For research purposes only. This guide describes the chemical identity and laboratory handling of Selank and summarises findings reported in published research. It is not medical advice and does not describe any effect, dose, or use in humans or animals.
What is Selank?
Selank is a synthetic heptapeptide (seven amino acids) with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP), structurally based on the peptide tuftsin. It is supplied as a lyophilised powder for laboratory research.
PurePeptides offers Selank at >99% purity strictly for in-vitro research use. This page describes its chemical identity and handling only.
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP), based on the naturally occurring immunomodulatory peptide tuftsin with an added Pro-Gly-Pro tail for stability. Like Semax, it originates from Russian neuropeptide research and is also referenced by the code TP-7.
Chemical identity & specifications
| Product | Selank |
| Synonyms | TP-7 |
| Classification | Synthetic heptapeptide (tuftsin analogue) |
| Sequence | Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP) |
| Molecular weight | ~751.9 g/mol |
| CAS number | 129954-34-3 |
| Solubility | Water-soluble |
| Purity | >99% |
| Physical form | Lyophilised powder |
| Storage | -20°C lyophilised; 2-8°C reconstituted |
| Intended use | Research use only - not for human consumption |
Handling Selank in research protocols
In laboratory settings, lyophilised Selank is typically stored at -20°C, protected from light and moisture, until use. For reconstitution, bacteriostatic water is a commonly cited solvent; once in solution, the material is generally kept refrigerated at 2-8°C with freeze-thaw cycles minimised to preserve peptide integrity.
Researchers quantify Selank by concentration within their experimental system — for example molar concentrations for in-vitro work, or amount-per-mass figures in animal models. These are parameters defined by the study design and reported in the literature; they are not dosing guidance for any human or animal use. To convert between vial mass, solvent volume, and target concentration for laboratory preparation, our peptide reconstitution calculator may be useful.
Findings reported in the research literature
Selank appears in neuropeptide research literature as a synthetic tuftsin analogue, studied in in-vitro and animal-model research on stress- and immune-related signalling pathways. It is referenced as a synthetic reference compound within this area.
Any effects described in this literature are observations made in controlled experimental systems — cell assays and animal models — and are reported here only to summarise the scientific record. They do not constitute claims about outcomes, efficacy, benefits, or safety in humans, and nothing on this page should be read as encouraging human or animal use. Readers interested in the primary research can review the indexed literature via PubMed’s Selank results.
Selank and Semax: synthetic neuropeptides
Selank is frequently discussed alongside Semax. Both are synthetic heptapeptides from the same lineage of Russian neuropeptide research, but they derive from different parent sequences:
| Peptide | Sequence | Based on | Approx. MW |
| Selank | TKPRPGP | Tuftsin | ~751.9 g/mol |
| Semax | MEHFPGP | ACTH(4-10) fragment | ~813.9 g/mol |
For the companion compound, see our Semax research guide. Both are supplied by PurePeptides strictly as research materials, with no claim regarding outcomes in humans or animals.
Purity and quality control in research-grade Selank
In laboratory research, peptide purity has a direct bearing on reproducibility: synthesis by-products or residual reagents can confound experimental observations. PurePeptides supplies Selank at greater than 99% purity as a lyophilised powder.
In peptide manufacturing, purity is typically assessed by reverse-phase high-performance liquid chromatography (HPLC), while identity is confirmed by mass spectrometry (MS) against the expected molecular weight — approximately 751.9 g/mol for Selank. A certificate of analysis (COA) documenting these results is available on request for the current batch. When evaluating any research-grade peptide, requesting the COA and confirming both the purity figure and the mass-spec identity is good laboratory practice.
Frequently asked questions
Selank is a synthetic heptapeptide with the sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro (TKPRPGP), based on the peptide tuftsin, supplied as a lyophilised powder for research use only.
It is also referred to by the research code TP-7.
Both are synthetic heptapeptides from Russian neuropeptide research, but Selank is based on the peptide tuftsin (sequence TKPRPGP) while Semax is based on the ACTH(4-10) fragment (sequence MEHFPGP).
PurePeptides supplies Selank at greater than 99% purity as a lyophilised powder. A certificate of analysis (COA) is available on request for the current batch.
Store the lyophilised powder at -20°C, protected from light and moisture. In the laboratory it is commonly reconstituted with bacteriostatic water; once in solution, store refrigerated at 2-8°C and minimise freeze-thaw cycles.
Research-grade Selank is available from PurePeptides at greater than 99% purity, with same-day dispatch before 3PM and tracked UK & EU delivery. It is sold strictly for laboratory research use only.
Related comparisons
Research-grade Selank
Greater than 99% purity, lyophilised powder, same-day dispatch before 3PM with tracked UK & EU delivery. Research use only.
Buy Selank →Disclaimer: All products supplied by PurePeptides are strictly for laboratory research use only. They are not for human or animal consumption and are not medical products. This guide is informational and summarises publicly available research; it is not medical, clinical, or dosing advice.