What is Selank?
Selank is a synthetic peptide developed in Russia as a longer, more stable version of tuftsin. Tuftsin is a four-amino-acid fragment (Thr-Lys-Pro-Arg) of the heavy chain of immunoglobulin G. Selank adds a Pro-Gly-Pro tail to that fragment, giving the seven-residue sequence Thr-Lys-Pro-Arg-Pro-Gly-Pro. Suppliers label it Selank or Selank acetate.
Selank is often mentioned in the same breath as Semax because both came from the same Russian research tradition and both end in Pro-Gly-Pro. They are different molecules, though: Selank is built on an immune-protein fragment, while Semax is built on a fragment of the pituitary hormone ACTH. Research interest in Selank has centered on its behavior as a regulatory neuropeptide in laboratory settings. This page makes no claims about effects in people. It covers the math of mixing a Selank peptide vial with bacteriostatic water.
How much BAC water for a Selank vial?
Selank research vials are usually labeled 5 mg or 10 mg of freeze-dried powder. The powder amount is fixed; the water you add sets the concentration. The chart shows micrograms per unit on a U-100 syringe for common water volumes.
| BAC water | 5 mg vial | 10 mg vial |
|---|---|---|
| 1 mL | 50 mcg/unit 5 mg/mL | 100 mcg/unit 10 mg/mL |
| 2 mL | 25 mcg/unit 2.5 mg/mL | 50 mcg/unit 5 mg/mL |
| 3 mL | 16.67 mcg/unit 1.667 mg/mL | 33.33 mcg/unit 3.333 mg/mL |
| 5 mL | 10 mcg/unit 1 mg/mL | 20 mcg/unit 2 mg/mL |
Each cell shows mcg per unit on a U-100 syringe (100 units = 1 mL) and the resulting concentration.
Read across a row to compare the two vial sizes at the same water volume. Read down a column to see how more water lowers the micrograms in each unit. A selank 10mg reconstitution with a given volume is always twice as concentrated as a selank 5mg reconstitution with the same volume, which the chart makes easy to see. For the general ratio logic across many vial sizes, see the BAC water to peptide ratio guide.
Worked example: Selank reconstitution and dosage math
The calculator uses three steps. Vial mg ÷ water mL gives the concentration. The amount you enter ÷ that concentration gives the volume in mL. Volume in mL × 100 gives U-100 units. For example, if the amount you already have is 250 mcg, and the vial is 10 mg with 2 mL of water added:
The math: 10 mg ÷ 2 mL = 5 mg/mL (5,000 mcg/mL), which is 50 mcg per unit. 250 mcg ÷ 5,000 mcg/mL = 0.05 mL = 5 units on a U-100 syringe.
That figure is arbitrary and chosen because it divides cleanly; it is not a suggestion. Searches for selank reconstitution and dosage usually want exactly this conversion, from an amount to a syringe mark. If your result looks 1,000 times too big or too small, the cause is almost always a mix-up between mg and mcg, since 1 mg = 1,000 mcg. You can check the calculator math by hand in a few lines.
Selank dosage chart and dosing: what the numbers mean
People searching for a selank dosage chart, selank dosing or selank dosage are usually trying to translate an amount into units on a syringe. That is what this page does. You supply the amount; the calculator converts it using your vial size and the water you actually added. It does not set, suggest or check a dose, a schedule or a frequency. Those come from product labeling and a qualified professional.
The chart on this page is a units chart. Each cell is the number of micrograms in one U-100 unit for that vial and water pair, nothing more. Units are the same size on every U-100 syringe: 100 units = 1 mL, 1 unit = 0.01 mL. The U-100 syringe units to mL guide shows the full conversion.
Selank nasal spray vs vial reconstitution
Selank nasal spray is a common search, and it is worth being clear about what this calculator covers. The chart and calculator measure liquid in U-100 syringe units. Nasal sprays are measured differently, by the volume each spray pump delivers, which depends on the specific device. This page does not convert amounts into sprays and does not give spray instructions.
For vials, some suppliers specify bacteriostatic water as the diluent, and some labels describe adding the water slowly down the vial wall and swirling gently rather than shaking. Storage after mixing and how long a mixed vial is kept vary by product and should be taken from the labeling. If you are comparing Selank with its sister peptide, the Semax reconstitution calculator covers that compound’s vial sizes.
Selank regulatory status
Selank is not FDA-approved. Vials sold online are labeled for research use, and a calculator cannot confirm their identity, purity or sterility. The math here assumes the vial contains exactly what the label states and that you know the water volume you added. For other research compounds, browse the peptide library.
Selank FAQ
How much BAC water should I add to a Selank 10 mg vial?
There is no single correct volume. More water gives fewer micrograms per unit and less water gives more. The chart shows mcg per unit for several volumes; the product labeling controls what is used.
Is this a Selank dosage calculator?
It converts an amount you already have into mL and U-100 syringe units for your vial and water volume. It does not recommend or check a dose, schedule or frequency.
Can this page calculate Selank nasal spray amounts?
No. It works in U-100 syringe units. Nasal sprays are measured by the volume each pump delivers, which depends on the device, so this calculator does not cover them.
What is the difference between Selank and Semax?
Both are synthetic seven-amino-acid peptides ending in Pro-Gly-Pro, but Selank is built on tuftsin, an immune-protein fragment, while Semax is built on a fragment of the hormone ACTH.
Is Selank FDA-approved?
No. Selank is not FDA-approved, and research-labeled vials are sold for research use only.