Peptide Vial Math

Melanotan II dosage calculator

10 mg + 2 mL = 5 mg/mL, so 250 mcg is 0.05 mL, or 5 units on a U-100 syringe. Change the vial, the water or the amount and the syringe updates.

Also called: MT-2, Melanotan 2, MT-II, Melanotan II dosage calculator, Melanotan II reconstitution calculator.

By Peptide Vial Math Editorial Team Reviewed by the team on (how we review) Updated Formulas unit-tested (methodology)

Melanotan II reconstitution calculator

Vial mg, water mL and amount give syringe units

mg

Total printed on the vial label.

mL

Diluent volume you add (1 mL = 100 units on a U-100 syringe).

Amount unit

The mass you want in one draw. 1 mg = 1,000 mcg.

Syringe barrel
Show U-40 and U-50 syringes

Result

5units

to draw on a U-100 syringe, 100-unit barrel

Vial: 10 mg with 2 mL diluent 10 mg +2 mL
Syringe filled to 5.0 of 100 units 0 10 20 30 40 50 60 70 80 90 100 U-100, 1 mL
Volume
0.05 mL
Concentration
5 mg/mL
Per unit
50 mcg
Draws per vial
40

10 mg + 2 mL = 5 mg/mL, so 250 mcg is 0.05 mL, or 5 units on a U-100 syringe.

  • 5 units falls between tick marks. The nearest mark, 6 units, holds 0.3 mg.

Arithmetic only. Not a dosing recommendation. Check every figure against your vial label and lab protocol.

How many units is each Melanotan II amount?

At 10 mg + 2 mL (5 mg/mL) on a U-100 syringe:

Generated from the calculator's own functions. Rows are evenly spaced reference amounts, not suggested amounts. Amber readings don't fit a 100-unit barrel.

Melanotan II: 10 mg + 2 mL = 5 mg/mL, U-100 syringe
AmountmgVolume (mL)Syringe units
100 mcg 0.1 0.02 2
200 mcg 0.2 0.04 4
250 mcg 0.25 0.05 5
300 mcg 0.3 0.06 6
400 mcg 0.4 0.08 8
500 mcg 0.5 0.1 10
750 mcg 0.75 0.15 15
1,000 mcg 1 0.2 20
Engraving of glass burettes, one with a dark strip behind its graduation to make the tick marks easier to read
A burette with a dark strip behind its graduation, 1895. Pick a water volume that lands your reading on a printed mark. Public domain.

How much water for each Melanotan II vial size?

Melanotan II is sold in one common size (10 mg). The same water volume gives a different concentration in each, so the same reading means a different amount. Each cell shows mcg per unit with mg/mL in brackets.

Melanotan II: mcg per U-100 unit (mg/mL in brackets) by vial size and water added
Vial1 mL2 mL3 mL5 mL
10 mg 100 (10)50 (5)33.33 (3.33)20 (2)

How much bacteriostatic water for a 10 mg Melanotan II vial?

1 mL → 10 mg/mL, so 250 mcg is 2.5 units. 2 mL → 5 mg/mL, so 250 mcg is 5 units. 3 mL → 3.33 mg/mL, so 250 mcg is 7.5 units. The whole vial holds 40 draws of 250 mcg.

Worked example: 10 mg vial, 2 mL, 250 mcg

  1. Concentration. 10 mg ÷ 2 mL = 5 mg/mL (5,000 mcg/mL).
  2. Volume. 0.25 mg ÷ 5 mg/mL = 0.05 mL.
  3. Units. 0.05 mL × 100 = 5 units on a U-100 syringe.
  4. Check. One unit holds 50 mcg; 5 × 50 mcg = 250 mcg = 0.25 mg, which matches. The vial holds 40 draws of this size.

Melanotan II: notes for the arithmetic

Melanotan II amounts are usually written in micrograms, and a 10 mg vial in 2 mL is 5 mg/mL, so 250 mcg is only 5 units on a U-100 syringe. With 5 mL the same amount is 12.5 units, which is easier to read. The water volume changes the reading, not the amount.

For the lab procedure itself (materials, aseptic technique, mixing without foaming) see how to reconstitute peptides. For what bacteriostatic water is and how long an opened vial is kept, see the bacteriostatic water guide and the storage guide.

Frequently asked questions

How many units is 250 mcg of Melanotan II?

It depends on the water volume. 10 mg + 2 mL = 5 mg/mL, so 250 mcg is 0.05 mL, or 5 units on a U-100 syringe. With 1 mL instead it would be 2.5 units.

How much bacteriostatic water for a 10 mg Melanotan II vial?

There is no single correct volume. 1 mL gives 10 mg/mL (100 mcg per unit); 2 mL gives 5 mg/mL (50 mcg per unit); 3 mL gives 3.33 mg/mL (33.33 mcg per unit). Pick the volume that makes your reading easy to measure on the barrel you have.

How many mg of Melanotan II is 10 units?

10 units on a U-100 syringe is 0.1 mL. At 5 mg/mL (10 mg in 2 mL) that is 0.5 mg (500 mcg). At a different concentration the answer is different.

Is this a Melanotan II dosing calculator?

It is an arithmetic tool. It converts an amount you enter into a volume and a syringe reading; it does not suggest amounts, schedules or uses. Not approved by the FDA for any use. Sold as a research chemical only. It is a different substance from afamelanotide (Melanotan I) and from bremelanotide (PT-141), which are FDA-approved products.

Sources

  1. NDA 210797 approval letter: Scenesse (afamelanotide) implant, 16 mg — U.S. Food and Drug Administration, 2019
  2. NDA 210557 approval letter: Vyleesi (bremelanotide) subcutaneous injection — U.S. Food and Drug Administration, 2019
  3. FDA alerts health care providers, compounders and patients of dosing errors associated with compounded injectable semaglutide products — U.S. Food and Drug Administration, 2024

Links checked 2026-10-19.