Selank
2 specifications · $108.00 – $125.00 · supplied as lyophilised powder for in-vitro laboratory research use only.
Selank is a short peptide with the molecular formula C33H57N11O9 and a molecular weight of 751.9 g/mol (PubChem CID 11765600). Aegis Bio supplies it as lyophilised powder in 2 specifications, for in-vitro laboratory research use only.
Supplied against a ≥99% HPLC purity specification. Lots are analysed by Janoshik Analytical, an independent laboratory commissioned by the manufacturer, and Aegis Bio submits selected lots to Accumark in California for its own independent verification. The figure measured for the lot supplied is stated on its certificate of analysis, available by request before ordering. What each section of a COA establishes.
Chemical identity
- Molecular formula
C33H57N11O9- Molecular weight
- 751.9 g/mol
- PubChem CID
- 11765600
- CAS number
129954-34-3- Also listed as
- Thr-Lys-Pro-Arg-Pro-Gly-Pro; TP-7
Identity values sourced from PubChem for the named compound. Lot-specific purity and identity are stated on the certificate of analysis for the batch supplied — see how to read a COA.
Specifications and pricing
| Specification | SKU | Format | Availability | Price (USD) | Add to order |
|---|---|---|---|---|---|
| 5 mg x 10 vials | SK5 | Pack of 10 | In stock | $108.00 | |
| 10 mg x 10 vials | SK10 | Pack of 10 | In stock | $125.00 |
Prices are in USD and include the vial. Flat-rate shipping is added at checkout, with a reduced rate on larger kit orders. Payment is accepted in on-chain Bitcoin or USDT (ERC-20); orders remain pending until payment is verified.
Cost per milligram
| Specification | Total material | Price | Cost per mg |
|---|---|---|---|
| 10 mg x 10 vials | 100 mg | $125.00 | $1.250/mg |
| 5 mg x 10 vials | 50 mg | $108.00 | $2.160/mg |
Choosing a specification
Selank is listed in 2 specifications. Measured by cost per milligram — the only figure that compares cleanly across different strengths and vial counts — the best value is the 10 mg x 10 vials at $125.00, which works out to $1.250/mg. The least efficient listing is the 5 mg x 10 vials at $108.00, or $2.160/mg — a 1.7× premium per milligram.
Selank is supplied in pack format only. Higher-strength packs carry a lower cost per milligram than lower-strength packs, because a fixed share of the price covers the vial, the fill and handling rather than the material itself — so buying strength is generally better value than buying count. See cost per milligram for the full comparison method.
Reconstitution reference
Resulting concentration by vial strength and diluent volume. Arithmetic only, provided for laboratory preparation and dilution planning — this is not dosing guidance. The method is set out in the reconstitution and dilution guide.
| Vial | +1 mL | +2 mL | +3 mL | +5 mL |
|---|---|---|---|---|
| 5 mg | 5.00 mg/mL | 2.50 mg/mL | 1.67 mg/mL | 1.00 mg/mL |
| 10 mg | 10.00 mg/mL | 5.00 mg/mL | 3.33 mg/mL | 2.00 mg/mL |
Molar reference
Molar quantity per vial at each available strength, calculated from a molecular weight of 751.9 g/mol. Useful where a protocol is specified in molar rather than mass terms. Values are for the free peptide; net peptide content per vial depends on water and counter-ion content stated on the certificate of analysis.
| Vial | Micromoles | Nanomoles |
|---|---|---|
| 5 mg | 6.650 µmol | 6650 nmol |
| 10 mg | 13.300 µmol | 13300 nmol |
Physicochemical profile
Selank is a short peptide: 53 heavy atoms with 19 rotatable bonds and a computed structural complexity index of 1360. Its topological polar surface area is 322 Ų, with 9 hydrogen-bond donors and 12 acceptors, and a computed XLogP of -6.1 places it in the strongly hydrophilic range. The reference structure is formally neutral.
For identity confirmation by mass spectrometry the figure to compare against is the monoisotopic mass, 751.43407244 Da, rather than the average molecular weight of 751.9 g/mol. The two diverge as molecules get larger, because the average weight accounts for natural isotope abundance across every atom. See what identity and purity each prove.
| Descriptor | Value |
|---|---|
| Monoisotopic mass | 751.43407244 Da |
| Average molecular weight | 751.9 g/mol |
| Topological polar surface area | 322 Ų |
| Computed XLogP | -6.1 |
| Hydrogen-bond donors / acceptors | 9 / 12 |
| Rotatable bonds | 19 |
| Heavy atoms | 53 |
| Formal charge | 0 |
| Structural complexity index | 1360 |
Descriptors are computed values published by PubChem for the reference structure. They describe the molecule, not the supplied lot — measured purity and identity for the batch you receive are stated on its certificate of analysis.
How this compares within its class
By best available cost per milligram it ranks 2 of 4 in Neuro & Cognitive, against a class range of $0.420 to $1.450 per mg. At 751.9 g/mol it is the second lightest of the 4 compounds in this class with a published molecular weight, which is what drives the molar figures above. It is listed in 2 specifications, against a class median of 2.
Comparisons are drawn from the current Aegis Bio catalog and are procurement figures only — they carry no implication about relative suitability for any purpose. See the full neuro & cognitive class →
Catalog record
- Supplier label
- 10mg*10vials; 5mg*10vials
- Catalog codes
SK10, SK5- Price list
- 2026 edition
Specification strings are reproduced as supplied on the manufacturer price list. Where a supplier string and the normalised specification differ in formatting, the normalised value in the table above is what is fulfilled.
Storage and handling
These are among the shortest sequences in the catalog, with correspondingly low molecular weights, which means a given mass contains a far higher molar quantity than a comparable mass of a long-chain analogue. Where your work is planned in molar terms, use the conversion table below rather than working from mass.
- Lyophilised powder: store sealed at −20 °C, protected from light and moisture.
- Bring sealed vials to room temperature before opening, so warm air does not condense moisture onto cold powder.
- Reconstitute with bacteriostatic water directed against the vial wall; do not shake or vortex. Swirl gently until dissolved.
- After reconstitution: store at 2–8 °C and use within the working period established by your laboratory.
- Avoid repeated freeze–thaw cycles. Aliquot where the solution will be accessed repeatedly.
Full detail in the storage and handling guide.
Documentation
A certificate of analysis is available by request for the batch supplied, covering HPLC purity and mass-spectrometry identity confirmation. The two measurements answer different questions — identity confirms the molecule, purity quantifies how much of the sample it represents. See what each one proves.
Frequently asked
What specifications of Selank are available?
Selank is listed in 2 specifications: 5 mg x 10 vials, 10 mg x 10 vials. Prices are in USD and include the vial.
Is a certificate of analysis available for Selank?
Yes. A certificate of analysis is available by request for the batch supplied, covering HPLC purity and mass-spectrometry identity confirmation. Request the COA for a specific lot before ordering if your protocol requires documentation on file.
Why does molar quantity matter more for these compounds?
These are among the shortest sequences in the catalog, so a given mass contains a much higher molar quantity than the same mass of a long-chain analogue. Where work is planned in molar rather than mass terms, use the molar reference table on this page rather than converting from the label mass.
How should Selank be stored?
Store the lyophilised powder sealed at −20 °C, protected from light and moisture. After reconstitution, store at 2–8 °C and avoid repeated freeze–thaw cycles. Bring sealed vials to room temperature before opening to avoid condensation onto cold powder.
What does shipping cost?
Carts made up entirely of single vials ship for $20.00. Any cart containing a multi-vial kit ships for $60.00 standard or $80.00 expedited, with single vials included free. From 4 kits upward the rate drops to $30.00 standard or $50.00 expedited. Shipping is added at checkout and revalidated on the server before the order is accepted.
How is payment handled?
Payment is accepted in on-chain Bitcoin or USDT on Ethereum (ERC-20). No card details are collected. Orders remain pending until the payment is verified on-chain, after which a confirmation is sent.