Vial duration

Melanotan-2 vial duration calculator

Estimate how many weeks one 10 mg Melanotan-2 vial covers at your dose and weekly cadence.

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Last updated: May 13, 2026

Vial (mg)

Dose (mg)

Doses / week

Total doses

Lasts

2.9 weeks

Melanotan-2 weeks-of-supply at common cadences

How long one 10 mg Melanotan-2 vial covers at a 0.5 mg per dose, for three weekly cadences. Total doses per vial: 20.

Doses per week	Total doses per vial	Weeks of supply
6	20	3.3
7	20	2.9
8	20	2.5

Math weeks-of-supply assumes every dose draws cleanly. Stability typically caps a reconstituted vial at 4–6 weeks of refrigerated use regardless of how much liquid remains.

Worked example

How long one Melanotan-2 vial lasts, the long version

Total doses in the vial: floor(10 ÷ 0.5) = 20. The floor matters — a partial dose at the bottom doesn't count.
Cadence: 7 doses per week for Melanotan-2 at this example step.
Math weeks-of-supply: 20 ÷ 7 = 2.9 weeks of liquid in the vial.
Stability ceiling: most reconstituted peptides are typically used within 4–6 weeks of refrigerated storage. Whichever number is smaller is the one that binds your refill date.
Doubling the dose roughly halves both numbers — and titration usually closes the gap between "math weeks" and "stability weeks" without you noticing.

Scenarios people actually run into

Three things that come up logging Melanotan-2

Math says one 10 mg Melanotan-2 vial covers 2.9 weeks at 0.5 mg per dose. Stability typically caps a reconstituted vial at 4–6 weeks. Whichever number is smaller is the date on your refill calendar.
Titration up doubles the dose and halves the vial. A 12-week-on-paper vial becomes a 6-week vial the day you step up — order the next vial the same day you take the step.
Shipping windows are the silent third constraint. If your supplier runs 1–3 weeks, the refill order has to leave at least that long before "math weeks" or "stability weeks," whichever is binding.

Same-category neighbor

Melanotan-2 next to GHRP-2

Both sit in the Melanocortin bucket — here's the vial duration math side by side on each one's example vial.

	Melanotan-2	GHRP-2
Vial	10 mg	5 mg
Cadence	7/wk	7/wk
Weeks of supply	2.9	7.1

Want the full breakdown? GHRP-2 reference →

Melanotan 2 is a peptide people inject to develop a deeper tan with less sun exposure by activating the body's own pigment-producing cells. It binds to melanocortin receptors that signal melanocytes to make more melanin, and it can also trigger libido effects as a side effect. In small studies, users developed visibly darker skin within 2–4 weeks of consistent low-dose use. This page covers reconstitution math and how people typically log a loading-then-maintenance schedule.

Planning Melanotan-2 vials in real life

Melanotan-2 has a two-phase vial-duration story. During loading (daily doses for 2-3 weeks), a 10 mg vial covers ~20 doses at 0.5 mg — finished inside 3 weeks, well within stability. During maintenance (1-2 doses per week), the math says one vial covers 10-20 weeks, but reconstituted stability caps usable life at 4-6 weeks regardless of how much liquid is left.

The cleanest pattern: loading-phase users finish a vial naturally; maintenance-phase users reconstitute smaller volumes (1 mL of water instead of 2 mL) so each vial stretches to fewer total doses but stays inside the stability window. Discarding a half-full vial at week 6 is unavoidable on the standard 2 mL reconstitution at maintenance cadence.

Storage and shelf life for Melanotan-2

Lyophilized Melanotan-2 powder is typically stored refrigerated until reconstitution. The in-use reconstituted vial is kept refrigerated and used within several weeks.

How the Melanotan-2 vial duration calculator works

A 10 mg Melanotan-2 vial covers 20 doses at the 0.5 mg step — about 3 weeks at daily loading. Maintenance phase (1-2 doses per week) stretches the same vial across a few months, but stability caps it at 4-6 weeks of refrigerated use.

The formula is two divisions. Total doses per vial equals vial mg divided by dose mg, rounded down. Weeks of supply equals total doses divided by doses per week. With a 10 mg vial of Melanotan-2, a 0.5 mg dose, and 7 dose per week, the vial covers 20 doses, or about 2.9 weeks of supply.

The three inputs that move the answer: vial mg (set when you bought the vial), dose mg (set by your protocol step), and doses-per-week (set by the peptide's half-life). Once a vial is reconstituted it also has a stability ceiling — most lyophilized peptides reconstituted in BAC water are typically used within four to six weeks of refrigerated storage, so a vial that mathematically lasts twelve weeks may not last twelve weeks in practice.

Common Melanotan-2 vial-planning mistakes

Reading 0.5 mg as 10 units regardless of vial concentration. The unit count depends on diluent volume.
Reusing the previous vial's unit count after changing diluent volume.
Not writing the reconstitution date on the vial.

Frequently asked questions about Melanotan-2 vial duration

How does the Melanotan-2 vial duration calculator estimate weeks of supply?

It floors total doses (vial mg ÷ dose mg) then divides by doses per week. For this Melanotan-2 example — a 10 mg vial, 0.5 mg per dose, 7 dose/week — that's floor(10 ÷ 0.5) ÷ 7 = about 2.9 weeks. Flooring matters: a partial dose left in the vial doesn't count. Maintenance-phase Melanotan-2 always hits the stability ceiling before emptying — plan to discard rather than overshoot.

Should I plan refills around the math, or around stability?

Whichever runs out first. Math says Melanotan-2 at the example dose lasts the calendar weeks shown above. Stability says most reconstituted peptides are typically used within 4–6 weeks of refrigerated storage regardless of how much liquid is left. If the math says 12 weeks but stability caps at 5, plan around 5 — and reconstitute the next vial with less water so you finish it in the stability window. Maintenance-phase Melanotan-2 always hits the stability ceiling before emptying — plan to discard rather than overshoot.

Does titrating the Melanotan-2 dose up shorten vial life?

Yes, often dramatically. Doubling the dose halves the doses-per-vial. The calculator shows real-time how a step-up changes the weeks-of-supply line, so you can re-time refill orders before a titration event rather than discovering the gap mid-protocol. Maintenance-phase Melanotan-2 always hits the stability ceiling before emptying — plan to discard rather than overshoot.

What if I take Melanotan-2 less often than the default cadence here?

Drop the doses-per-week field. With 7 dose/week the example vial lasts about 2.9 weeks; halving the cadence roughly doubles that, but you'll hit the stability ceiling first. A vial that mathematically covers 16 weeks rarely covers 16 weeks in practice. Maintenance-phase Melanotan-2 always hits the stability ceiling before emptying — plan to discard rather than overshoot.

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