Reconstituting a Melanotan 2 vial comes down to one number: how many units do you draw on the syringe? This calculator gives you that in one step. Enter how much bacteriostatic water you're adding to your 10 mg vial and your target dose, and it returns the exact insulin-syringe mark, the concentration you've made, and how many doses the vial holds.
Melanotan 2 has a distinctive profile for a calculator: it almost always comes in a single 10 mg vial, and the doses are tiny — community routines start around 0.25 mg and titrate up to roughly 0.5–1 mg. That means MT-2 draws are small (often well under 15 units), and the standard approach is a low-start ladder rather than a fixed dose. The calculator handles those sub-milligram conversions and flags when a draw is too small to read cleanly. Below the tool we walk through the math, the titration ladder, and what real MT-2 users mix — alongside the safety context that belongs with any unlicensed compound. For where MT-2 sits among the peptides people use for skin and tanning, start with the roundup.
Key Takeaways
- Two-step math: concentration = vial mg ÷ bac water mL, then units = (dose mg ÷ concentration) × 100 on a U-100 syringe.
- Anchor example: a 10 mg vial + 2 mL of bacteriostatic water = 5 mg/mL; a 0.5 mg dose = 0.1 mL = 10 units, and the vial yields 20 doses.
- Start low and titrate. Community practice begins near 0.25 mg (about 5 units on this mix) and works up — both to gauge tolerance and because nausea and flushing are common early.
- Draws are tiny. Our usage data shows a median draw of about 7.5 units, so reading the mark precisely matters; a U-50 syringe helps at the smallest doses.
- One vial is many doses. At ~0.5 mg, a 10 mg vial holds about 20 doses, so cost per dose is very low.
- Unlicensed compound. MT-2 is not approved anywhere as a medicine; regulators warn against it, and changing moles need a dermatologist. Treat every figure as calculation context, not advice.
| You enter | Value | The calculator returns | Value |
|---|---|---|---|
| Melanotan 2 in vial | 10 mg | Concentration | 5 mg/mL |
| Bacteriostatic water | 2 mL | Volume to draw | 0.1 mL |
| Target dose | 0.5 mg | Draw to this mark | 10 units (U-100) |
| Syringe type | U-100 | Doses per vial | 20 |
How do you calculate a Melanotan 2 dose?
MT-2 reconstitution is two steps: work out the vial's concentration, then convert your sub-milligram dose into a volume you can read on the syringe. The units you draw are simply that volume on the insulin scale.
In plain arithmetic:
- Concentration (mg/mL) = vial mg ÷ bac water mL. A 10 mg vial in 2 mL is 10 ÷ 2 = 5 mg/mL.
- Volume (mL) = dose mg ÷ concentration. A 0.5 mg dose at 5 mg/mL is 0.5 ÷ 5 = 0.1 mL.
- Units = volume × 100 on a U-100 syringe (100 units = 1 mL). So 0.1 mL = 10 units.
Collapsed into the single formula the calculator runs:
units = (dose mg ÷ (vial mg ÷ bac water mL)) × 100 = dose mg × bac water mL ÷ vial mg × 100
Sanity-check our example: 0.5 × 2 ÷ 10 × 100 = 10 units. For doses per vial, divide the vial's milligrams by your dose: 10 mg ÷ 0.5 mg = 20 doses.
Our take: MT-2 is dosed in fractions of a milligram from a single 10 mg vial, so there's no overflow risk — even a 1 mg dose is a fifth of the barrel. The real subtleties are two: the draw is small enough that a unit of error is a meaningful slice of the dose, and the dose itself isn't fixed — it climbs a ladder from a cautious start. The calculator's job is to turn each rung of that ladder into a readable unit mark.
The Melanotan 2 titration ladder
MT-2 use almost always starts low — around 0.25 mg — and steps up over days to a maintenance dose near 0.5–1 mg, so the number you enter changes as you climb; the calculator converts each step into units. Starting low is partly about tolerance: nausea, facial flushing, and appetite changes are common at first and tend to ease as the body adjusts.
On the common 5 mg/mL mix (10 mg in 2 mL), each rung of the ladder lands on a clean unit mark, which is one reason that concentration is so popular.
The ladder reads cleanly at 5 mg/mL: 5, 10, 15, 20 units for 0.25, 0.5, 0.75, and 1 mg. The catch is the bottom rung — a 0.25 mg loading dose is only 5 units, and if you mix a stronger vial (10 mg in 1 mL, 10 mg/mL) it drops to a barely-readable 2.5 units, where the calculator raises a precision flag and suggests more water or a U-50 syringe. Whether and how fast to climb the ladder is a protocol decision outside the calculator's scope; see our Melanotan 2 dosing and protocol guide.
How much bacteriostatic water should you add to Melanotan 2?
With MT-2's single 10 mg vial and sub-milligram doses, the water you add is purely a readability choice — 2 mL (giving 5 mg/mL) is the common pick because it lands the whole dose ladder on clean unit marks. There's no overflow risk to worry about, only how easy the small draw is to read.
Because the vial is always 10 mg, the only variable is the water, and it sets the concentration directly: 1 mL gives 10 mg/mL, 2 mL gives 5 mg/mL, 3 mL gives 3.33 mg/mL. A 0.5 mg dose is 5 units at 10 mg/mL, 10 units at 5 mg/mL, or 15 units at 3.33 mg/mL — all easy fits, just at different spots on the barrel. More water makes each draw larger and easier to read, which is why the crowd leans toward 2 mL rather than 1 mL. Because ProtocolPlus tracks reconstitutions, we can show the water volumes real MT-2 users log on the 10 mg vial:
- 1 mL → 10 mg/mL (about 35% of logged mixes). Compact, but a 0.25 mg loading dose is just 2.5 units.
- 2 mL → 5 mg/mL (about 40%, the most common). The whole ladder reads on clean marks.
- 3 mL → 3.33 mg/mL (about 25%). The easiest reads, if the vial holds the volume.
The clear favorite is 2 mL, the setup our default example uses. It keeps a 0.5 mg dose at a readable 10 units and a 0.25 mg loading dose at 5, without diluting so far that the vial can't hold the water.
How do you read tiny Melanotan 2 draws on an insulin syringe?
On a U-100 syringe 100 units = 1 mL, so a unit is a hundredth of a millilitre — but for MT-2's small draws a U-50 syringe (50 units = 0.5 mL) spaces the same volume across marks that are twice as far apart, which is easier to hit. The "units" you read are always a measure of volume, not of how much MT-2 you're taking.
Across our tracked MT-2 doses the median draw is just 7.5 units, with most doses under 15. At that scale, syringe choice is the biggest precision lever you have.
The distribution hugs the low end of the barrel — there's simply no way to overflow a single syringe with a sub-milligram dose from a 10 mg vial. Three calibrations exist (U-100, U-50, U-40); for MT-2, a U-50 0.3 mL barrel is often the better tool, because it stretches a 5-to-10-unit draw across more readable spacing. Always confirm which syringe you're holding, since a unit means a different volume on each. The same mg-to-units conversion drives our general peptide dosage calculator for any compound.
Melanotan 2 reconstitution chart: units by water and dose
This chart shows the concentration each water volume makes on the 10 mg vial and the U-100 units to draw, so you can pick a setup that lands your dose on a readable mark. For any other setup, use the calculator.
| Setup (10 mg vial) | Concentration | 0.25 mg | 0.5 mg | 1 mg |
|---|---|---|---|---|
| 10 mg + 1 mL | 10 mg/mL | 2.5 u | 5 u | 10 u |
| 10 mg + 2 mL | 5 mg/mL | 5 u | 10 u | 20 u |
| 10 mg + 3 mL | 3.33 mg/mL | 7.5 u | 15 u | 30 u |
The most readable setup for the low-start ladder is the dilute end (2–3 mL), which lifts a 0.25 mg loading dose from an awkward 2.5 units up to 5–7.5 units. The most-searched single conversions, for a quick sanity check:
- 0.25 mg Melanotan 2 on a 5 mg/mL vial = 0.05 mL = 5 units (a common loading dose).
- 0.5 mg Melanotan 2 on a 5 mg/mL vial = 0.1 mL = 10 units.
- 1 mg Melanotan 2 on a 5 mg/mL vial = 0.2 mL = 20 units.
How many Melanotan 2 doses are in a vial, and what does each cost?
Doses per vial is the vial's 10 mg ÷ your dose — and because MT-2 doses are sub-milligram, a single vial holds many. Dividing the vial price by that number gives a true cost per dose.
A 10 mg vial at a 0.5 mg dose yields 20 doses; at the 0.25 mg loading dose it's 40. That makes MT-2 one of the slowest-emptying compounds we track — the median reconstituted vial lasts about a month — and very cheap per dose. Across our tracked MT-2 vials the median works out to roughly 20 doses per completed vial at about $1.62 per dose.
| Economics output | How it's computed | Example (10 mg vial, 0.5 mg dose, $32 vial) |
|---|---|---|
| Doses per vial | vial mg ÷ dose mg | 20 doses |
| Cost per dose | vial price ÷ doses per vial | $1.60 |
| Weekly cost | cost per dose × doses per week | $4.80 (3×/week) |
| Approx. monthly cost | weekly × 4.3 | ~$21 |
mg, mcg, units, and mL: keeping the four numbers straight
Milligrams measure the MT-2; millilitres and units measure the liquid you draw. Because MT-2 doses are fractions of a milligram, it's easy to slip between mg and mcg — 0.5 mg is 500 mcg, and confusing them is a 1,000× error. Keep the families separate and the math is easy.
Some vendors quote MT-2 doses in micrograms (500 mcg) and others in milligrams (0.5 mg); they're the same dose. Here is a 0.5 mg dose expressed four ways on a 5 mg/mL vial, one quantity wearing four labels:
| Label | Value | What it describes |
|---|---|---|
| Dose in milligrams | 0.5 mg | mass of MT-2 |
| Dose in micrograms | 500 mcg | mass of MT-2 |
| Volume to draw | 0.1 mL | liquid volume |
| Units to draw (U-100) | 10 units | liquid volume on the syringe |
Why concentration is the number that actually matters
Concentration (mg/mL) is the hinge of every MT-2 calculation — and since the vial is always 10 mg, it's set entirely by the water you add. It connects the milligrams in the vial to the units on the syringe.
Concentration is an exchange rate between milligrams of MT-2 and millilitres of liquid. A 5 mg/mL vial trades every 1 mL for 5 mg; your dose occupies a volume set by that rate, and the syringe scale turns it into a unit mark. Add more water and the same dose occupies more volume and more units — an easier read for a tiny dose. That's why, for MT-2, choosing your water volume is choosing how readable the ladder will be.
It's also why you can never compare unit numbers across reconstitutions. "Draw 10 units" means 0.5 mg on a 5 mg/mL vial but 1 mg on a 10 mg/mL vial — double. Every unit instruction online is valid only for that exact concentration.
How to reconstitute Melanotan 2, step by step
Add the bacteriostatic water slowly down the vial wall, swirl gently until clear, and never shake. The peptide is delicate, and rough mixing degrades it before your first dose.
- Calculate first. Use the tool above to set your water volume and target unit mark, and check the precision flag — at the 0.25 mg loading dose, aim for a draw you can read cleanly.
- Room temperature, then swab both stoppers with a fresh alcohol swab.
- Draw your measured water into a reconstitution syringe.
- Add slowly down the wall of the MT-2 vial, onto the glass rather than the powder.
- Swirl, don't shake until the solution is completely clear.
- Inspect. Clear and particle-free, or don't use it.
- Label and refrigerate at 2–8 °C, then dose at the unit mark the calculator gave you.
Reconstitution troubleshooting
- The loading draw is only a couple of units. Not an error — your concentration is high for such a small dose. Use more bacteriostatic water, or switch to a U-50 syringe for finer marks.
- The powder won't fully dissolve. Give it a few minutes and keep swirling gently; warmth helps. A vial that stays cloudy or shows particles shouldn't be used.
- Foam or a hard vacuum pull. Some vials are under vacuum; vent briefly with an empty needle or add the water slowly down the wall.
Common Melanotan 2 reconstitution mistakes
- Skipping the low start. The ladder exists for tolerance; jumping to a full dose tends to mean more nausea and flushing.
- Confusing mg with mcg. A 1,000× error; 0.5 mg is 500 mcg.
- Reading "units" as milligrams. Units are a volume; always convert through the calculator.
- Using too little water. On a 10 mg vial, 1 mL makes the loading dose a hard-to-read 2.5 units — 2 mL reads better.
- Copying someone else's unit count, and not labeling the date on a vial that lasts weeks.
Melanotan 2 vial size, supplies, and water
Melanotan 2 is sold almost exclusively as a 10 mg vial, so the only reconstitution variable is the water — pick the volume that lands your dose ladder on readable marks. A 2 mL fill (5 mg/mL) is the standard choice.
A quick supplies checklist: the lyophilized 10 mg MT-2 vial, bacteriostatic water (sterile water with 0.9% benzyl alcohol) as the diluent, a reconstitution syringe (1–3 mL), a U-100 or U-50 insulin syringe (a U-50 reads small draws better), alcohol swabs, and a marker for the date. Use bacteriostatic — not preservative-free or non-injectable — water for a vial you'll use over several weeks. MT-2 is injected subcutaneously; it is never an intravenous compound.
How long does reconstituted Melanotan 2 last?
Once mixed, MT-2 is far less stable than the dry powder, and there's no validated shelf life — but because doses are tiny and a vial holds many, it commonly lasts a month or more of intermittent use. Judge by appearance, not just the calendar.
Peptides in solution degrade through hydrolysis, deamidation, oxidation, and aggregation, sped up by heat, light, and agitation, so a mixed vial belongs in the refrigerator at 2–8 °C, kept dark, and never frozen. In our usage data the median reconstituted MT-2 vial is finished in about 31 days — the slowest-emptying compound in the set, a direct result of the many-doses-per-vial math. Discard any vial that turns cloudy, changes color, or shows particles. For the deeper science, see our peptide storage and stability guide.
What the evidence and regulators say about Melanotan 2
Melanotan 2 is an unlicensed, unapproved synthetic analog of alpha-melanocyte-stimulating hormone, and multiple national regulators have warned against injecting it — so the dosing figures here are community convention only, paired with a real safety caveat about moles and melanoma. We give the figures so you know what to enter into the calculator, not as a recommendation to use it.
MT-2 stimulates melanocortin receptors (chiefly MC1R) to increase skin pigmentation, which is why it's used for tanning; the same broad melanocortin activity drives its side effects. Dermatology guidance describes it as an unlicensed product associated with nausea, facial flushing, changes in moles, the appearance of new or atypical naevi, and rarer serious events (DermNet NZ, 2015, Oakley, "Melanotan II", retrieved 2026-06-16). Public-health regulators have issued explicit warnings against unlicensed melanotan tanning injections (Therapeutic Goods Administration (Australia), "Don't risk using tanning products containing melanotan", retrieved 2026-06-16). The broader pharmacology of chronic melanocortin activation, including both potential effects and risks, continues to be reviewed in the literature (NCBI / PMC, 2024, "Benefits and risks of chronic MC1R activation", retrieved 2026-06-16), and case reports document serious adverse events such as vascular complications after MT-2 use (NCBI / PMC, 2020, "Melanotan II-associated renal infarction", retrieved 2026-06-16). There is no approved label and no validated human dose. The common 0.25–1 mg figures are a community convention to calculate from if you choose to; the most important practical step is to have a clinician monitor your skin and any changing moles.
How precise does your Melanotan 2 draw need to be?
Because MT-2 draws are small (often 5–10 units), precision matters more than for a milligram peptide: at 5 mg/mL, one U-100 unit is 0.05 mg, so being off by a single unit on a 0.5 mg (10-unit) draw shifts the dose by 10 percent. That's the argument for using enough water to spread the draw and, at the 0.25 mg loading dose, a U-50 syringe whose marks are twice as far apart.
Frequently asked questions
Sources
Factual claims (regulatory status, safety, pharmacology) are sourced below. Dose values in examples are community conventions, not recommendations; MT-2 is unlicensed and has no validated human dose. ProtocolPlus usage figures are first-party app data.
- DermNet NZ (2015) — Oakley A, Melanotan II (unlicensed alpha-MSH analog; adverse effects including changing moles and atypical naevi). https://dermnetnz.org/topics/melanotan-ii — retrieved 2026-06-16.
- Therapeutic Goods Administration, Australia — Don't risk using tanning products containing melanotan (regulator warning). https://www.tga.gov.au/news/blog/dont-risk-using-tanning-products-containing-melanotan — retrieved 2026-06-16.
- NCBI / PMC11664455 (2024) — Benefits and risks of chronic MC1R activation (review). https://pmc.ncbi.nlm.nih.gov/articles/PMC11664455/ — retrieved 2026-06-16.
- NCBI / PMC7148395 (2020) — Melanotan II-associated renal infarction (case report). https://pmc.ncbi.nlm.nih.gov/articles/PMC7148395/ — retrieved 2026-06-16.
About this guide. Written by Jordan Vance, peptide and biohacking researcher (placeholder, replace before publish), and medically reviewed by Dr. Maya Ellison, MD, biochemistry (placeholder, replace before publish), for the ProtocolPlus Research Team. This calculator and article are educational and not medical advice.