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Selank reconstitution calculator

Medically reviewed by Juan Pablo Frías, MD · · DisclosureUpdated Educational use only
1Vial size
2Bacteriostatic water added
3Dose per injection
4Syringe (U-100)
Draw to
12units
= 0.12 mL on a 1 mL U-100 insulin syringe
5 mg vial2 mL water300 mcg dose
Concentration
2.5 mg/mL
Doses per vial
16
Weeks (1 dose/wk)
16
Math only. It does not recommend a dose. Selank: Not FDA approved · research chemical.

12 units (0.12 mL) on a 1 mL U-100 syringe: 300 mcg from a 5 mg vial + 2 mL water (Selank).

Dosing table for a 5 mg vial

Syringe units (U-100) for each dose, by how much bacteriostatic water you add.

Selank: U-100 syringe units per dose for a 5 mg vial
Dose1 mL water2 mL water2.5 mL water3 mL water
100 mcg2456
250 mcg51012.515
300 mcg6121518
500 mcg10202530
750 mcg153037.545
1000 mcg20405060

How the math works

Concentration is the vial's milligrams divided by the water you add. Volume to draw is your dose divided by that concentration. On a U-100 syringe, 1 mL is 100 units, so units = mL × 100.

5 mg ÷ 2 mL = 2.5 mg/mL
300 mcg = 0.3 mg; 0.3 mg ÷ 2.5 mg/mL = 0.12 mL
0.12 mL × 100 = 12 units

How many units is 300 mcg of Selank?

With a 5 mg vial and 2 mL of bacteriostatic water, 300 mcg is 12 units (0.12 mL) on a U-100 syringe. With 1 mL of water it is 6 units. The answer always depends on how much water was added.

How much bacteriostatic water for a 5 mg Selank vial?

The water only sets the concentration; the amount of Selank in the vial stays the same. 2 mL makes 2.5 mg/mL, so 300 mcg is 12 units. 2.5 mL makes 2 mg/mL, so the same 300 mcg is 15 units. More water makes small doses easier to measure but needs more volume per injection.

How many 300 mcg doses are in a 5 mg vial?

5 mg is 5,000 mcg; 5,000 ÷ 300 = 16.67, so 16 full doses of 300 mcg. Any liquid lost in the needle and vial is not counted.

Preset doses are round numbers for the arithmetic, not dosing guidance. Vial sizes are the ones most often mentioned for Selank in community discussions.

12 units · 0.12 mL · 300 mcg from 5 mg + 2 mL

Sources

  1. 1Metric (SI) Prefixes (NIST Reference on Constants, Units, and Uncertainty)National Institute of Standards and Technology (NIST) · 2025physics.nist.govAccessed 2 Oct 2026
  2. 2BASAGLAR (insulin glargine) injection, prescribing information (DailyMed)U.S. Food and Drug Administration / DailyMed (Eli Lilly and Company label) · 2026dailymed.nlm.nih.govAccessed 2 Oct 2026

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