About Selank
Selank is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) made by extending the tetrapeptide tuftsin with Pro-Gly-Pro. Biogenesis Labs supplies Selank as lyophilized powder in 10 mg vials, for laboratory research use only.
Research-grade vials: Selank 10 mg. Every batch is independently tested — see the Certificates of Analysis.
How to calculate Selank concentration
concentration (mg/mL) = Selank in vial (mg) ÷ diluent volume (mL)
- A 10 mg Selank vial with 2 mL of bacteriostatic water is 5.00 mg/mL (5,000 mcg/mL).
- On a U-100 syringe, 100 units = 1 mL, so each unit holds 50.0 mcg.
- Use 3 mL instead and the same vial reads 3.33 mg/mL, or 33.3 mcg per unit. More diluent lowers the concentration; the Selank in the vial does not change.
For U-40 syringes (40 units = 1 mL), divide mcg/mL by 40 instead of 100. The calculator above switches between both scales.
Selank reconstitution chart
Concentration for each Biogenesis Labs vial size across common diluent volumes. “In 10 units” is the Selank contained in 10 units on a U-100 syringe (0.10 mL).
Selank 10 mg vial
| Diluent | Concentration | mcg / mL | Per U-100 unit | In 10 units | U-100 units per 1 mg |
|---|---|---|---|---|---|
| 1 mL | 10.00 mg/mL | 10,000 | 100.0 mcg | 1.00 mg | 10.00 |
| 1.5 mL | 6.67 mg/mL | 6,667 | 66.7 mcg | 0.67 mg | 15.00 |
| 2 mL | 5.00 mg/mL | 5,000 | 50.0 mcg | 0.50 mg | 20.00 |
| 2.5 mL | 4.00 mg/mL | 4,000 | 40.0 mcg | 0.40 mg | 25.00 |
| 3 mL | 3.33 mg/mL | 3,333 | 33.3 mcg | 0.33 mg | 30.00 |
| 4 mL | 2.50 mg/mL | 2,500 | 25.0 mcg | 0.25 mg | 40.00 |
| 5 mL | 2.00 mg/mL | 2,000 | 20.0 mcg | 0.20 mg | 50.00 |
Values are rounded. Figures describe solution concentration only and are not recommendations.
Reconstituting and storing a Selank vial
Let the sealed vial reach room temperature, swab both stoppers, and run the diluent slowly down the inside wall of the vial rather than onto the powder. Swirl gently until dissolved — don't shake — and label the vial with the concentration and date. Reconstituted solutions are commonly kept refrigerated at 2–8 °C and protected from light. The full step-by-step guide, syringe-scale explainer and BAC vs. sterile water comparison are on the main Peptide Calculator page.
Selank calculator FAQ
What concentration does a 10 mg Selank vial with 3 mL of bacteriostatic water give?
3.33 mg/mL (3,333 mcg/mL). On a U-100 syringe that is 33.3 mcg per unit, and 10 units hold 0.33 mg.
What concentration does a 10 mg Selank vial with 2 mL give?
5.00 mg/mL, or 50.0 mcg per unit on a U-100 syringe.
How many U-100 units contain 1 mg of Selank?
It depends on the concentration: units per mg = 100 ÷ concentration in mg/mL. At 3.33 mg/mL (10 mg in 3 mL) 1 mg is in 30.00 units; at 5.00 mg/mL (10 mg in 2 mL) it is in 20.00 units.
How much bacteriostatic water should be added to a Selank vial?
There is no single correct volume. The volume comes from your own research protocol; the calculator and chart show the concentration each volume produces. Only add a volume your vial can hold.
Is there a Semax calculator too?
Yes, see the Semax calculator. Both are 10 mg vials, so the charts match.
Does this Selank calculator provide dosing guidance?
No. It performs concentration and unit-conversion math only. All Biogenesis Labs products are supplied for laboratory research use only and are not for human consumption.
