Two laboratories opened the vials
A Danish group bought this product the way a reader would, from online shops, and measured what came out. Every shop described its vial the same way. The contents did not match, and did not match each other either.
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Reconstitution · Melanotan II
Melanotan II reconstitution 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
- Vial strengthamount printed on the vial
- Bacteriostatic water addedhow much water you added
- Target doseenter the dose you want to convert
This vial holds 10,000 mcg in total.
- Syringe typematch the label on your syringe
U-100 insulin syringe · 1 mL · lines every 2 units · 1 unit = 0.01 mL
Draw to
14.0units
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.
10 mg ÷ 2 mL = 5.00 mg/mL
→ 50 mcg/unit · 700 mcg = 0.140 mL = 14.0 units
→ 50 mcg/unit · 700 mcg = 0.140 mL = 14.0 units
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Show the math and syringe details
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How to use the calculator
- STEP 1
Enter the amount in the vial
- STEP 2
Enter the water you added
- STEP 3
Enter the dose you want to convert
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 a 10 mg Melanotan II vial
Each row starts with the same 10 mg vial and changes only the amount of water. More water makes the mixture less concentrated, so the same dose uses more syringe units.
◆ How the water amount changes the resultdose used: 700 mcg
| Water added | Concentration | Per U-100 unit | Draw for 700 mcg | Nearest syringe line |
|---|---|---|---|---|
| 1 mL | 10.00 mg/mL | 100.0 mcg | 7.0 u · 0.070 mL | 6 u · 14.3% off |
| 2 mL | 5.00 mg/mL | 50.0 mcg | 14.0 u · 0.140 mL | exactly 14 u |
The vial, water 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.
The input this tool trusts is the one thing nobody can check
Every calculator on this site starts from the strength written on a vial. That is usually a safe place to start. Here it is the weakest link in the whole page, and two laboratories have said so in print.
Why the arithmetic cannot rescue it
The sum on this page is a division. It takes a mass, spreads it through a volume of water, and reports how far up the barrel the plunger has to come.
What a wrong strength does in each direction
Both directions have a cost and they are not the same cost. A vial holding less than its label means somebody takes less than they think, which mostly wastes their money.
One strength, and why there is only one
Only one vial size is offered because both measurement papers examined that same size.
What the trial actually measured, and in what units
There is a human trial and it is the source of the amounts on this page. It ran in three men, decades ago, as a safety study rather than a product study.
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.
| U-100 line | Volume | Mass (mcg) | Mass (mg) |
|---|---|---|---|
| 10 u | 0.10 mL | 500 mcg | 0.5 mg |
| 20 u | 0.20 mL | 1,000 mcg | 1 mg |
| 30 u | 0.30 mL | 1,500 mcg | 1.5 mg |
| 40 u | 0.40 mL | 2,000 mcg | 2 mg |
| 50 u | 0.50 mL | 2,500 mcg | 2.5 mg |
| 60 u | 0.60 mL | 3,000 mcg | 3 mg |
| 70 u | 0.70 mL | 3,500 mcg | 3.5 mg |
| 80 u | 0.80 mL | 4,000 mcg | 4 mg |
| 90 u | 0.90 mL | 4,500 mcg | 4.5 mg |
| 100 u | 1.00 mL | 5,000 mcg | 5 mg |
How the math works
- Concentration — divide the amount in the vial by the water you added: mg ÷ mL = mg/mL. This tells you how many mg are in each mL.
- Volume — the dose divided by that concentration: dose ÷ (mg/mL) = mL.
- 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.
- Rounding gap — the exact draw against the nearest syringe line: |exact − nearest line| ÷ exact × 100 = % difference.
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
Melanotan II side effects, as the sources describe them
Reconstituting Melanotan II at 10 mg, step by step
What the Melanotan II draw needs from the Zepbound vial draw
Choosing buying the mixing water for a Melanotan II draw
What the Melanotan II draw needs from the two waters