Selank Dosage Calculator
Calculate Selank injection volumes. Pre-filled for a 10mg vial with 2ml BAC water (5,000 mcg/ml). Typical 250mcg dose = 5 units.
Selank is a synthetic heptapeptide analogue of the endogenous tetrapeptide tuftsin, developed at the Institute of Molecular Genetics in Moscow. It is studied for anxiolytic (anti-anxiety) effects without sedation, as well as cognitive enhancement through BDNF modulation. Research protocols use 250–500mcg per dose.
For a 10mg Selank vial: add 2ml of bacteriostatic water → concentration is exactly 5000 mcg/ml. A commonly referenced 250mcg research dose = 0.05ml (5 units) on a 100-unit syringe.
Dose Reference Table
Pre-calculated for a 10mg vial + 2ml BAC water = 5,000 mcg/ml concentration. Using a 100-unit (1ml) insulin syringe.
| Dose | Inject Volume (ml) | Syringe Units |
|---|---|---|
| 100mcg | 0.020 ml | 2 units |
| 200mcg | 0.040 ml | 4 units |
| 250mcg | 0.050 ml | 5 units |
| 500mcg | 0.100 ml | 10 units |
| 1000mcg | 0.200 ml | 20 units |
About Selank
Selank is a synthetic heptapeptide developed by the Institute of Molecular Genetics of the Russian Academy of Sciences. It was derived from tuftsin, a tetrapeptide with immunomodulatory properties, with a stabilizing extension. Selank has anxiolytic (anxiety-reducing) properties and is classified as a nootropic peptide.
Unlike conventional benzodiazepine anxiolytics, Selank does not appear to cause sedation, tolerance, or withdrawal. Its mechanism is thought to involve modulation of the GABAergic system and stabilization of enkephalins (endogenous opioid peptides). Research has also explored its effects on serotonin, dopamine, and BDNF (brain-derived neurotrophic factor) levels.
Selank is approved in Russia as an anxiolytic medication but is not FDA-approved. In research contexts outside Russia, it is studied for anxiety reduction, cognitive enhancement, mood stabilization, and immune modulation. It is typically administered via subcutaneous injection or intranasal route.
Selank is supplied in 10mg vials. Using 2ml of bacteriostatic water gives 5,000 mcg/ml. Common research doses range from 250–750mcg, administered 1–2 times daily. It has a relatively short half-life of 1–2 hours.
How this calculator works
Every result comes from the same three formulas used for any lyophilized peptide: concentration (mcg/ml) = vial mg × 1,000 ÷ BAC water ml; injection volume (ml) = desired dose mcg ÷ concentration; syringe units = injection volume ml × 100 on a U-100 syringe.
For the preset Selank setup on this page: a 10mg vial mixed with 2ml of bacteriostatic water gives a concentration of 5,000 mcg/ml. A 250mcg dose then needs 0.05ml, which is 5 units on a 100-unit insulin syringe.
The full methodology, with worked examples and the assumptions behind each formula, is on the methodology page.
Accuracy & limitations
The arithmetic itself is exact — the same inputs always produce the same output. Real-world accuracy depends on things outside the calculator: actual vial contents can vary slightly from the labeled amount within manufacturing tolerance, the BAC water volume should be measured carefully, and syringe readings are taken at the bottom edge of the plunger. Reconstituted peptides also degrade over time (the common guidance is to use within about 28 days refrigerated), which the math does not model. This tool does arithmetic only — it does not recommend doses, and it is not medical advice.
Last reviewed: September 2026 · Content, formulas and sources checked by Kanika