Selank Reconstitution Calculator

What is Selank?

Selank is a synthetic heptapeptide developed in Russia as an analog of the endogenous immunomodulatory tetrapeptide tuftsin, extended with a proline-glycine-proline tail intended to increase enzymatic stability. Published research — much of it from Russian laboratories — has studied Selank in animal models of anxiety, stress response, and cognitive performance. Selank has been registered as a pharmaceutical in Russia but is not approved by the FDA in the United States. Research-grade Selank sold by chemical supply companies is labeled for laboratory research only.

Common vial sizes

Research vendors typically offer Selank in 5 mg or 10 mg lyophilized vials. Reconstitution with 2–3 mL of bacteriostatic water is commonly reported.

• 5 mg vial
• 10 mg vial

Reconstitution examples

Worked examples showing exactly what a given vial, bacteriostatic water volume, and target dose produce in syringe units. All math is from the same calculator above.

• 5 mg vial + 2 mL bacteriostatic water → 2500 mcg/mL concentration.
  A 250 mcg dose = 10 units on a u-100 insulin, 1 ml (100 units) (0.1 mL).
• 5 mg vial + 2 mL bacteriostatic water → 2500 mcg/mL concentration.
  A 500 mcg dose = 20 units on a u-100 insulin, 1 ml (100 units) (0.2 mL).
• 10 mg vial + 3 mL bacteriostatic water → 3333.33 mcg/mL concentration.
  A 500 mcg dose = 15 units on a u-100 insulin, 1 ml (100 units) (0.15 mL).
• 5 mg vial + 3 mL bacteriostatic water → 1666.67 mcg/mL concentration.
  A 750 mcg dose = 45 units on a u-100 insulin, 1 ml (100 units) (0.45 mL).

Storage & shelf life

Lyophilized Selank is typically stored refrigerated. Reconstituted solutions are commonly refrigerated and protected from light.

Reported half-life

Published work reports a short plasma half-life for the unmodified Selank parent peptide. The extended stability of the molecule relative to tuftsin has been characterized in Russian literature.