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Reconstitution · Melanotan II

Melanotan II dosage calculator

Pick the vial, the water you added and the dose. Get the exact draw in units for the syringe in your hand.

Step 1 of 4

  1. How many mg are in your vial?
    Vial amounttotal mg in the calculation
  2. How many mL of water did you add?
  3. What dose do you want to convert?
  4. Which syringe are you using?
Draw to
14.0units

0.14 mL in the syringe · 14 calculated doses from this amount

14.0 units on a U-100 insulin syringe · 1 mL · lines every 2 units, which is 0.14 milliliters. The draw lands on a syringe line.

Easy to read on this syringe. The calculated volume matches the 14-unit line. No rounding is needed.

10 mg ÷ 2 mL = 5.00 mg/mL
→ 50 mcg/unit · 700 mcg = 0.140 mL = 14.0 units

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Show the math and syringe details

Can this syringe show the result clearly?

Easy to read on this syringe. 14.0 u is exactly the 14-unit line on a U-100 — no rounding error at all.

Want an easier syringe number?

This setup is already easy to read. Changing the water between 0.5 and 3 mL would not put 700 mcg closer to a line on this U-100 syringe.

Adding more water makes the mixture less concentrated, so the same dose uses more syringe units. It does not change how much peptide is in the vial.

This setup is in the address bar — every input is part of the link.

Educational math, not medical advice — dosing decisions belong to a licensed clinician. The available tabs also show supply calculations and any sourced schedule.

How to use the calculator

  1. 1

    Enter the amount in the vial

    Use the total mg printed on your Melanotan II vial.

  2. 2

    Enter the water you added

    Use the amount of water added to that vial, in mL.

  3. 3

    Enter the dose you want to convert

    Choose mg or mcg, then match the result to your syringe.

Melanotan II is a ring of seven amino acids. It copies a hormone the body already uses to tell skin cells to make more of the brown pigment that darkens a tan. People take it to tan faster and darker, usually alongside sunbeds or sun. A second, unadvertised reason is that it causes erections, which is why some men take it too.

One human trial exists, from 1996, in three men. It reported darker skin in two of them. It was a safety study, not a tanning study, and nothing followed it. The erections were not a stray finding either. That trial reported them, and a different molecule was later built from this one for that use alone.

Examples using 10 mg of Melanotan II

Each row uses 10 mg and the liquid volume shown. Dividing the amount by that volume gives the calculated concentration. The rows are arithmetic examples, not alternative product preparations.

◆ How liquid volume changes the resultdose used: 700 mcg

With 1 mL bacteriostatic water

7.0 units

Concentration
10.00 mg/mL
Each U-100 unit
100.0 mcg
Syringe volume
0.070 mL
Nearest line
6 units · 14.3% off

With 2 mL bacteriostatic water

14.0 units

Starting example
Concentration
5.00 mg/mL
Each U-100 unit
50.0 mcg
Syringe volume
0.140 mL
Nearest line
Exactly 14 units

The amount, liquid volume and dose shown here are the calculator’s starting example for Melanotan II. Replace them with your own values. Every result in the table is calculated from those inputs.

Drawn from once a week at 700 mcg, a 10 mg vial yields 14 doses — about 14.0 weeks of supply. No storage limit is assigned to this example. Follow the dispensing label for the specific product.

Melanotan-II’s small human trial does not verify another vial

The cited melanotan-II pilot study used doses based on body weight in a small group of volunteers. It recorded effects beyond tanning. It does not verify the contents, strength or safety of a separate vial with the same name.

Read the supporting evidence3 supporting notes

A wrong strength changes the actual draw

The tool assumes the mass entered is correct. If the real contents differ, so does the amount delivered in each draw. Less is not merely wasted money, and more may increase exposure. Exact math cannot correct an unknown vial strength.

Keep adverse findings beside the study context

The pilot reported nausea, fatigue and other symptoms. So few participants cannot tell us how often those events occur in a wider population. Later case reports can raise concerns, but alone cannot show how common an event is or what caused it.

Related tanning peptides are not the same product

A finding about another tanning peptide does not give a schedule for melanotan-II. Similar names do not mean the products are the same. The exact molecule, its route and what is in the preparation still matter.

Units to dose at 5.00 mg/mL

Mix 10 mg into 2 mL and one U-100 unit carries 50.0 mcg. The table shows how much peptide is in each numbered syringe line. These are conversion examples, not suggested doses.

Open the unit conversion table10 rows
Numbered U-100 syringe lines converted to volume and mass at 5.00 milligrams per milliliter.
U-100 lineVolumeMass (mcg)Mass (mg)
10 u0.10 mL500 mcg0.5 mg
20 u0.20 mL1,000 mcg1 mg
30 u0.30 mL1,500 mcg1.5 mg
40 u0.40 mL2,000 mcg2 mg
50 u0.50 mL2,500 mcg2.5 mg
60 u0.60 mL3,000 mcg3 mg
70 u0.70 mL3,500 mcg3.5 mg
80 u0.80 mL4,000 mcg4 mg
90 u0.90 mL4,500 mcg4.5 mg
100 u1.00 mL5,000 mcg5 mg

How the math works

  1. Concentration — divide the amount entered by the liquid volume used in the calculation: mg ÷ mL = mg/mL. This tells you how many mg are in each mL.
  2. Volume — the dose divided by that concentration: dose ÷ (mg/mL) = mL.
  3. Units — on a U-100 syringe one unit is 0.01 mL, so mL × 100 = units. A U-40 unit is 0.025 mL, so the wrong barrel is a 2.5× error. That is why the calculator asks which one you have.
  4. Rounding gap — the exact draw against the nearest syringe line: |exact − nearest line| ÷ exact × 100 = % difference.

Medically reviewed by Kenneth Montecillo, MD2026-09-07open the primary sources

Useful guides for this calculation

The math is only one part of the question. These guides cover the compound, published doses, side effects, mixing steps and supplies.

How strong the evidence is for Melanotan II

The strongest source for Melanotan II is a foreign approval or thin human data.

Melanotan II side effects, as the sources describe them

When Melanotan II reactions tend to appear, tied to that compound’s own escalation steps.

Reconstituting Melanotan II at 10 mg, step by step

The 10 mg Melanotan II table itself, not a general rule applied to an unrelated vial size.

What the Melanotan II draw needs from the Zepbound vial draw

What a label allows, stated for the Zepbound vial draw rather than for Melanotan II.

Choosing buying the mixing water for a Melanotan II draw

Can anybody just buy bacteriostatic water? The answer holds for Melanotan II as it does for anything else in a vial.

What the Melanotan II draw needs from the two waters

What a label allows, stated for the two waters rather than for Melanotan II.

1primary source, each with the day we read it — open the documents used on this page