Selank Calculator

Selank dosage calculator

The Selank dosage calculator above converts a target dose into exact syringe units based on your vial size and how much bacteriostatic water you used to reconstitute it. Selank is commonly sold in 5 mg, 10 mg vials. The calculator supports both U-100 and U-40 insulin syringes and flags draws that are too large for the syringe barrel or too small to measure accurately. A synthetic heptapeptide analog of the endogenous immunomodulatory tetrapeptide tuftsin, studied for anxiety-related signaling. Enter your target dose in the calculator above to see the exact number of units to draw.

Selank dosage chart

Selank and Tuftsin analog peptides

Selank is a Synthetic analog of tuftsin. A synthetic heptapeptide analog of the endogenous immunomodulatory tetrapeptide tuftsin, studied for anxiety-related signaling.

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.

See all Tuftsin analog peptides →

How to reconstitute Selank

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

Reconstituting Selank is the same unit-conversion process used for any lyophilized peptide:

1. Draw your chosen volume of bacteriostatic water into a syringe.
2. Inject the bacteriostatic water slowly down the side of the Selank vial — do not shoot it directly onto the powder.
3. Swirl gently until the powder fully dissolves. Do not shake.
4. Store the reconstituted vial refrigerated.
5. To dose, calculate your draw volume: divide your target dose by the concentration (vial mg ÷ water mL = mg/mL). The calculator above does this automatically.

For Selank specifically, 5 mg, 10 mg vials are common. A typical reconstitution adds 2 mL of bacteriostatic water, producing a concentration of 5 mg/mL for the 10 mg vial size.

Selank half-life and storage

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.

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

Common Selank dosing mistakes

Most Selank draw errors are unit errors, not arithmetic errors: confusing mg with mcg (1 mg = 1,000 mcg), or reading a U-40 syringe with U-100 math — the same printed mark holds 2.5× the volume. Two more worth avoiding: leaving the vial unlabeled, so the concentration and reconstitution date are lost, and under-diluting to the point where the draw is under about one unit and can no longer be read accurately.

Each of these is covered in full in the guides: reconstitution math from first principles, U-100 vs U-40 syringes, storage and shelf life, and how to reconstitute peptides.

Selank stacks

Selank is one of the ingredients in what is commonly referred to as the Nootropic stack . These are terms used in online peptide communities to describe specific combinations. See the stack pages for the full composition and calculator links.