How many units is 250 mcg of Melanotan II?

It depends entirely on how much water you added. In a 10 mg vial reconstituted with 2 mL, the concentration is 5 mg/mL, so 250 mcg is 0.05 mL, which is 5 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 2.5 units, and with 3 mL it is 7.5 units.

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

2 mL is the usual choice. It gives 5 mg/mL, which puts the commonly reported range of 100 mcg to 1000 mcg between roughly 2 and 20 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.

How many doses are in a 10 mg vial?

Divide 10 by your dose. At 250 mcg that is 40 doses, which at once daily is 40 days.

How many units is 250 mcg of Melanotan II?

In a 10 mg vial with 2 mL of water, 5 units on a U-100 syringe. With 1 mL of water it is 2.5 units, which is hard to read accurately.

Melanotan II dosage calculator

Melanotan II is dosed in micrograms from a 10 mg vial. Enter your water and dose to get the syringe mark, and see how the small starting doses land on the barrel.

IndependentThis site does not sell peptides and is not owned by a vendor. Every other calculator on page one of Google belongs to a shop.

The maths is openThe formula is written out on this page and the code behind it is a single file with an automated test suite.

How it earnsAffiliate links on one clearly marked page, and nowhere else. Never inside the calculator.

ReviewedDose ranges and half-life figures last checked 3 September 2026.

Dose to units, at the standard setup

Dose	Draw	U-100 units	Doses per vial	Vial lasts
100 mcg	0.02 mL	2 units	100	100 days
250 mcg	0.05 mL	5 units	40	40 days
500 mcg	0.1 mL	10 units	20	20 days
750 mcg	0.15 mL	15 units	13	13 days
1000 mcg	0.2 mL	20 units	10	10 days

Based on a 10 mg vial reconstituted with 2 mL of bacteriostatic water, which is 5 mg/mL, drawn on a standard U-100 insulin syringe, once daily.

About the numbers above

Melanotan II is a synthetic analogue of alpha-MSH that darkens skin by stimulating melanin. It is not approved anywhere, has been the subject of regulator warnings, and is sold for research. Nausea, flushing and new or darkening moles are the most reported effects.

Reports describe starting at 100 to 250 mcg to test tolerance, rising over days to 500 mcg or so, then dropping to occasional maintenance doses. A 10 mg vial with 2 mL of water is 5,000 mcg/mL, so 250 mcg is 0.05 mL, or 5 units. That is a small draw; 3 mL of water makes it 7.5 units. Melanotan I (afamelanotide) is a different, longer-acting compound with its own dosing.

A 10 mg vial at different water volumes

If the draw feels awkward to read, change the water rather than the dose. The dose stays the same; only the mark moves.

Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
10 mg	1 mL	10 mg/mL	0.025 mL	2.5 units	40
10 mg	2 mL	5 mg/mL	0.05 mL	5 units	40
10 mg	3 mL	3.33 mg/mL	0.075 mL	7.5 units	40

All rows above assume a 250 mcg dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it stays in you

Not well characterised in humans. This site only draws a decay curve where a half-life is actually documented in humans, so there is none here. Treat any precise figure you see elsewhere for Melanotan II with suspicion.

Common questions

How many units is 250 mcg of Melanotan II?: It depends entirely on how much water you added. In a 10 mg vial reconstituted with 2 mL, the concentration is 5 mg/mL, so 250 mcg is 0.05 mL, which is 5 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 2.5 units, and with 3 mL it is 7.5 units.
How much bacteriostatic water for a 10 mg Melanotan II vial?: 2 mL is the usual choice. It gives 5 mg/mL, which puts the commonly reported range of 100 mcg to 1000 mcg between roughly 2 and 20 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.
How many doses are in a 10 mg vial?: Divide 10 by your dose. At 250 mcg that is 40 doses, which at once daily is 40 days.
How many units is 250 mcg of Melanotan II?: In a 10 mg vial with 2 mL of water, 5 units on a U-100 syringe. With 1 mL of water it is 2.5 units, which is hard to read accurately.

Buying Melanotan II? The where to buy page lists the vendors this site uses and what to check before ordering, and Peptide Bureau keeps the ranked vendor scorecard.

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Read this before you use the numbers. This is a unit-conversion tool. It converts a vial strength and a volume of bacteriostatic water into a concentration, a draw volume and a mark on an insulin syringe. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most of the compounds listed here are sold for laboratory research use and are not approved for human use. Nothing on this site is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always confirm the strength printed on your own vial rather than trusting a preset.