What is Melanotan I?

What the name refers to

Melanotan I is a peptide supplied as a dry, freeze-dried powder sealed in a glass vial. It is not liquid when you receive it. The powder is a fixed mass of drug substance, and the vial label states that mass. In the listings this page draws on, that mass is 10 mg.

The powder is inert as far as dosing arithmetic is concerned. It becomes a dose only once liquid is added, because a dose is a mass and you measure liquid by volume. Everything on this page is the conversion between those two things.

This site does not describe what Melanotan I does in the body, what it is used for, or what happens to people who use it. There is no medical review here and no clinical judgment. If you want to know whether this compound is appropriate for you, that question belongs to a clinician, not to a calculator.

Regulatory status

Melanotan I is in an unusual position among peptides sold online: a regulator has approved a form of it for human use in at least one market. That is a meaningful distinction from compounds that exist only as research chemicals, because it means a formal review of manufacturing, labeling and indication happened somewhere.

It does not follow that a vial bought from a research supplier is the same product. Approval attaches to a specific manufacturer, a specific formulation and a specific route, under a specific brand and prescription. A lyophilized vial sold as research material shares a name with the approved product and nothing else that can be verified from the outside.

Approval also says nothing about the legal status of buying or possessing the compound where you live. Those are separate regimes and they vary by country. Check yours.

Reading the concentration table

The table above shows what a 10 mg vial becomes at three common reconstitution volumes. Three things in it are worth pulling out.

First, the drug mass never changes. Adding more bacteriostatic water does not add or remove peptide. It spreads the same 10 mg through more liquid, so each milliliter carries less. The vial holds exactly one vial's worth of drug no matter which row you pick.

Second, the relationship is inverse and it is exact. Doubling the water from 1 mL to 2 mL halves the concentration from 10 mg/mL to 5 mg/mL. Tripling it to 3 mL gives 3.33 mg/mL, which is the only figure in the table that does not come out clean. That value is rounded. When a concentration does not divide evenly, every volume you calculate from it inherits a small rounding error, which is a practical argument for choosing a water volume that gives a tidy number.

Third, the choice of water volume is a choice about measurement resolution, not about strength. A more dilute vial means any given dose occupies more liquid, which is easier to draw accurately on a fine syringe scale. A more concentrated vial means less liquid per dose. Neither changes how much peptide the vial contains.

What is not known

There is no reliable human pharmacokinetic data for Melanotan I that this site is willing to rely on. That means this page makes no claim about its half life, how long it takes to clear, whether it accumulates with repeated administration, or how long any effect might last.

That gap matters for dosing frequency in particular. Frequency questions are pharmacokinetic questions. Without clearance data you cannot reason from first principles about how often something should be given, and this site will not pretend otherwise by quoting a plausible-sounding interval.

The arithmetic on this page is unaffected by that gap, because concentration is pure division. Mass divided by volume. It holds regardless of what the compound does once it is in a body.

Turning a concentration into a syringe volume

Once you know the concentration, the conversion is one step: divide the intended dose in milligrams by the concentration in milligrams per milliliter. The result is a volume in milliliters. That volume is what you draw.

Doses appearing in listings for this compound cluster at 0.5 mg, 1 mg and 2 mg. Those are figures from listings, not recommendations, and this site does not endorse any of them. Run whichever one applies to you through the division above using the row of the table that matches your reconstitution.

Insulin syringes are marked in units rather than milliliters, and on a U-100 syringe the unit scale is a fixed linear mapping of the barrel volume. Once you have your answer in milliliters you can read it directly off the barrel. Do the division before you open anything, write the number down, and check it against the vial label rather than against memory.

What we do not know

We hold no reliable human pharmacokinetic data for Melanotan I, so this site makes no claims about its half life, how long it takes to clear, or how it accumulates. The arithmetic below concerns concentration and volume only.

This page answers arithmetic and handling questions. It does not tell you what dose to take, what to expect, or whether anything is appropriate for you, and there is no medical review behind it.

Common questions

How much bacteriostatic water should I use for a 10 mg Melanotan I vial?

There is no correct answer, only a tradeoff. Using 1 mL gives 10 mg/mL, 2 mL gives 5 mg/mL and 3 mL gives 3.33 mg/mL, all from the same 10 mg of peptide. More water means each dose occupies more liquid and is easier to measure precisely; less water means a smaller volume per dose.

Does adding more water make the vial weaker?

It makes each milliliter weaker, not the vial. The vial still contains the same total mass of peptide. Adding water changes how that mass is distributed through the liquid, which changes how much liquid a given dose occupies.

What is the half life of Melanotan I?

This site does not state one. We hold no reliable human pharmacokinetic data for this compound, so we make no claim about its half life, clearance or accumulation. Any figure you see quoted elsewhere should be traced to its source before you rely on it.

Is Melanotan I approved?

A regulator has approved a form of it for human use in at least one market. That approval applies to a specific licensed product, not to research-grade vials sold under the same name. Legal status for purchase and possession is separate and varies by country.

Why is 3.33 mg/mL not a round number?

Because 10 does not divide evenly by 3. The figure is rounded, and any dose volume you calculate from it carries that rounding forward. If you want clean arithmetic, a reconstitution volume that divides the vial mass evenly avoids the issue.

Can this page tell me what dose to use?

No. This site computes concentration and volume and nothing else. It has no medical review and does not assess safety, efficacy or suitability. Dose selection is a clinical question.