The questions below are the ones researchers ask most about storing, mixing and handling Selank. Each answer reflects the peptide’s sequence, Thr-Lys-Pro-Arg-Pro-Gly-Pro, and links to the fuller page where there is one.
How long does Selank last in the fridge after mixing?
Mixed with bacteriostatic water and kept at 2 to 8 °C in the dark, Selank lasts 8 to 12 weeks under Vistara Labs’ handling guidance, with quality slowly fading from around week 6 to 8. No published stability study of Selank in bacteriostatic water was found, so the window is general guidance that its chemistry supports. The full table is on how long Selank lasts.
How long does unmixed Selank powder last?
The sealed lyophilised vial is Selank at its most stable. It is kept in the fridge for everyday storage or the freezer for long-term holds, boxed and dark. The dry cake has almost no water, so the slow reactions that affect Selank in solution have little to work with, and days at room temperature in transit do not harm it.
What is the difference between Selank and tuftsin?
Tuftsin is the natural tetrapeptide Thr-Lys-Pro-Arg. Selank is tuftsin with Pro-Gly-Pro added to its C-terminus, giving seven residues. The tail makes it more resistant to the enzymes that break short peptides down, the same approach used for Semax.
Why is Selank so stable?
Its sequence has no methionine, cysteine, tryptophan, histidine or tyrosine to oxidise, and no asparagine, glutamine or aspartic acid to deamidate or isomerise. Three prolines resist aggregation. What remains is slow backbone hydrolysis and possible ring closure at the N-terminus, both slow at fridge temperature. The details are on the Selank stability page.
What do you mix Selank with?
Bacteriostatic water, which is sterile water with 0.9% benzyl alcohol so a refrigerated vial can be accessed more than once. Selank is hydrophilic and carries a net positive charge at that pH, so it dissolves fully without acid or other solvents. The reasons are on the Selank solubility guide.
How much bacteriostatic water goes in a 10 mg Selank vial?
There is no single correct volume. With 2 mL a 10 mg vial gives 5 mg/mL; with 1 mL it gives 10 mg/mL. More water spreads the same amount of peptide through a larger volume, so write the chosen concentration on the vial. The tables and calculator are on the Selank reconstitution page.
Should Selank be dissolved in acetic acid?
No. Dilute acetic acid is used in labs to help basic or hydrophobic peptides dissolve, but Selank is already fully charged and soluble at the pH of bacteriostatic water. Acid adds nothing and speeds backbone hydrolysis.
Why is my Selank cloudy after mixing?
Brief cloudiness that clears within 10 to 15 minutes is usually trapped air from adding water too fast or shaking. A peptide this soluble does not cloud on its own, so haze, particles or a tint that appear later point to contamination, warm storage or freezing, and the solution is discarded. More in why peptides gel or go cloudy.
Can you freeze mixed Selank?
Not a vial that will be opened again, because repeated freezing and thawing promotes aggregation in peptide solutions and warms the solution each time. Laboratories that need frozen solution divide it into single-use aliquots and thaw each one once. Sealed powder can be frozen without concern. The ready-mixed spray is never frozen.
How should Selank nasal spray be stored?
At 2 to 8 °C, upright, capped and out of the light, and never frozen, the same way as a mixed vial. It arrives ready-mixed in sterile saline, so it goes into the fridge as soon as it arrives. The routine is in how to store a peptide nasal spray.
All products supplied by Vistara Labs are intended for laboratory research use only. They are not drugs, are not approved for human or veterinary use, and are not intended to diagnose, treat, cure or prevent any condition. Nothing on this page constitutes medical advice or guidance for use in humans.
