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How-to · reconstitution

How to reconstitute Melanotan II 10 mg

Put 1 mL of bacteriostatic water into the 10 mg Melanotan II vial. That makes 10.00 mg/mL. A 700 mcg dose is then 7.0 units on a U-100 syringe.

That volume is the one that lands the draw on a syringe line, so the reading can be checked by eye. More water makes a weaker mix and a bigger draw. Less water makes a stronger mix and a smaller one. The amount of Melanotan II in the glass never changes. Only the number of marks it takes does.

What matters first

Water to add
1 mL
Resulting strength
10.00 mg/mL
Example 700 mcg dose
7.0 U-100 units

What is Melanotan II?

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.

Medically reviewed by Jennifer Montecillo, MD · non-practicing medical reviewerReviewed 2026-08-13open the primary sources

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

◆ Unique to the 10 mg vialU-100 example draws
Water addedConcentrationPer U-100 unitExample: 700 mcg =
1 mL10.00 mg/mL100 mcg7.0 units
2 mL5.00 mg/mL50 mcg14.0 units

Straight arithmetic: concentration = 10 mg ÷ water, and 1 U-100 unit = 0.01 mL. The example column shows the math at 700 mcg; it is not a dose recommendation.

Which volume to use is a practical choice rather than a dose. Pick the one that puts your draw somewhere you can actually read it on the syringe. The flags in the last column mark where that fails. “Hard to measure” means the draw is too small to judge by eye. “Won’t fit” means it is bigger than one U-100 syringe holds.

Melanotan II 10 mg vial: how much water to add. Each row is what that amount draws on a U-100 syringe. 1 mL makes 10.00 mg/mL, or 100 mcg a unit, and 700 mcg is 7 units. 2 mL makes 5.00 mg/mL, or 50 mcg a unit, and 700 mcg is 14 units. The barrel drawn here is filled to 7 units, the draw at 1 mL. The sum is 10 mg divided by the water. One U-100 unit is 0.01 mL.
The 10 mg vial at 1 mL on a U-100 barrel. 700 mcg fills to 7.0 units, at 10.00 mg/mL.

The sum is right and the vial is the problem

Every other page in this family converts a known mass into a volume. This one converts a mass printed on a label that two laboratories checked and did not find inside the glass. The table is still worth reading, and what it cannot see is worth reading first.

4Read the full vial record — 4 notes

What the label says and what was in the glass

A group in Denmark bought this product from three separate online shops. All three described the vial the same way, at the strength this page is built on. The measured contents ran from under half that to just under nine tenths of it.

A forensic laboratory in Belgium reached the same conclusion from the other end. It was handed seized vials, identified the powder, and put its purity at less than a third.

So the number this page divides is the number on a sticker. Two independent measurements say the sticker is optimistic, and by different amounts in different vials from different sellers.

Why a syringe cannot correct for it

Drawing is a volume measurement. It counts liquid, and it counts liquid identically whether the powder that dissolved into it was the full stated amount or half of it.

That is not a flaw in the arithmetic and it is not something a finer barrel would fix. The unknown sits upstream of every calculation on this site, at the moment somebody filled the vial.

The practical reading is that two vials bought from two shops can be a long way apart while both draws look identical on the plunger.

One size, two volumes, and both of them land clean

Only one strength is sold with a published measurement behind it, so there is no choosing between vials here. The single decision is how much water goes in.

Both listed volumes put the plunger on a printed line, and the larger one puts it at twice the mark of the smaller. Neither is wrong, and the wider one is easier to see against the barrel.

The powder provides fourteen draws at the worked amount. No published schedule pairs that count with a length of time, and no storage window is available for the mixed liquid.

Three recalls, and one of them names this vial

FDA’s recall database holds three entries under this name, all of them from United States compounding pharmacies and every one for the same reason: no assurance that the contents were sterile.

One of those entries describes a vial at exactly the strength on this page, sold by prescription and distributed nationwide, and it was pulled back for that reason.

Those recalls concern pharmacies that were at least registered and inspected. The vials the measurements above came from were bought from online shops that are neither.

How do you mix it, step by step?

  1. Wipe both stoppers with an alcohol swab and let them dry.
  2. Draw up the water volume you picked from the table.
  3. Let the water run slowly down the inside wall of the Melanotan II vial, rather than jetting it onto the powder.
  4. Swirl gently until it dissolves. Shaking damages peptides.
  5. Store it as the dispensing label directs. What happens after mixing differs by product — some labels direct against refrigerating the mixed solution at all.

What if your water volume is not on the table?

The table shows the offered water volumes. The calculator does the same arithmetic for any volume and any syringe, and shows its working line by line.

Open the Melanotan II calculator →

Where to read next about Melanotan II

The arithmetic on this page is only half the question. These are the pages that carry the other half.

Melanotan II research, dosing, and approval status

No regulator has approved Melanotan II; the guide separates human studies from reported use.

Mixing math for any vial, not just Melanotan II

One calculator for every vial on this site, with Melanotan II as one example

The other guides written like the Melanotan II ones

Water options, resulting concentrations and an example draw for each, with Melanotan II as context

Primary regulatory documents, including Melanotan II

Every URL was fetched and live on its retrieval date, Melanotan II or otherwise.

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