Reconstitution
How to Reconstitute Melanotan 2
Published by Peptara Labs · Updated · How we research and check our pages
The short answer
How to reconstitute Melanotan 2 comes down to a careful mixing step and then the units math. The standard technique brings the vial to room temperature, wipes both rubber stoppers with alcohol, draws the planned volume of bacteriostatic water into a U-100 insulin syringe, adds it slowly down the inside glass wall, and swirls until clear. The vial then goes into the fridge. The only Melanotan 2 specific part is the arithmetic: a 10mg vial in 2 mL, the Peptara standard, is 5 mg per mL; in 1 mL it is 10 mg per mL, and in 3 mL about 3.33 mg per mL. The volume changes how many units on the syringe correspond to a given amount in mg. It never changes how much peptide is in the vial.
Melanotan 2 ships as a freeze-dried powder. Before anything else happens it is mixed with bacteriostatic water, a process called reconstitution. The steps are easy. The arithmetic afterwards is where mistakes happen, which is why this page spends most of its length on it.
Education only
Melanotan 2 is not approved by a major regulator and has no approved dose, so every figure on this page is plain arithmetic that follows from the vial strength and the water volume. The tables read from a draw in units to the milligrams that draw carries, which is a conversion, not a schedule. Nothing here tells any individual what to take. Our Melanotan 2 page also names two precautions that come before the first vial is opened: document existing moles, and monitor blood pressure. That decision, like every other one here, belongs with a qualified clinician.
What bacteriostatic water is, and why it is the one to use
Bacteriostatic water for injection is sterile water containing 0.9 percent benzyl alcohol as a preservative, and it is the standard diluent for multi-use peptide vials. The preservative is what makes a multi-use vial possible at all: it inhibits bacterial growth in the vial between draws. A 10mg Melanotan 2 vial is a multi-use vial by design, so this is the diluent it takes.
Bacteriostatic water
Preserved, so the vial reopens
The benzyl alcohol inhibits bacterial growth in the vial between draws. This is the standard diluent for a peptide vial you will enter more than once.
Sterile water
A different product
Sterile water for injection is not bacteriostatic water and does not carry the benzyl alcohol preservative. The two vials look alike, so read the label rather than assuming which one is in front of you.
The Melanotan 2 walkthrough, step by step
About five minutes start to finish. The procedure is the same one on our general reconstitution page, with the volume and storage notes that apply to the 10mg vial. To run the same arithmetic on a different vial strength or a different volume, use the peptide reconstitution calculator.
Set the vials out and wipe both stoppers
If the MT-2 vial has been in a fridge, it is brought to room temperature before mixing. The standard technique then wipes the rubber stopper of both the peptide vial and the bacteriostatic water vial with a fresh alcohol swab and lets each surface air-dry for a few seconds. This is the single biggest contamination guard in the whole process.
Decide the bac water volume before anything is drawn
The volume sets the concentration for the life of the vial, so it is a decision, not a detail. The Peptara standard is 2 mL of bacteriostatic water for every vial we ship, and both our reconstitution quick-reference and the MT-2 complete guide work the 10mg vial at 2 mL. Guides elsewhere work the same vial at other volumes, and each volume produces a different unit count, which is exactly why the number has to be chosen deliberately and then written down.
Draw that volume into a U-100 insulin syringe
The syringe plunger is pulled to the chosen volume, the needle goes into the bacteriostatic water vial, and the water is drawn cleanly. A 1 mL U-100 syringe holds 100 units, so a 2 mL mix takes two full draws rather than one.
Inject the water slowly down the inside of the glass wall
The needle enters the MT-2 vial at an angle so the bacteriostatic water runs down the inner glass wall rather than landing directly on the freeze-dried cake. A slow stream protects fragile peptide bonds and keeps the finished solution clear.
Swirl gently until clear, never shake, then refrigerate and label
The vial is rolled between the palms or swirled on a flat surface until the powder is fully dissolved. Shaking creates foam and can fragment the peptide. Once mixed, the vial is stored at 2 to 8 Celsius with the bac water volume actually used written on the label, because every unit count calculated from here depends on that one number and nothing on the vial records it otherwise.
The math for a 10mg Melanotan 2 vial
One formula covers every volume and every vial strength. Everything below is that formula applied to the 10mg vial, which is the size in our catalog.
The formula
units = (amount in mg / vial strength in mg) × (bac water in mL × 100)
A U-100 insulin syringe holds 100 units per 1 mL, so 1 mL of reconstituted solution is 100 units. Put 10mg of Melanotan 2 into 2 mL and the vial holds 200 units in total, each carrying 0.05 mg. Read the formula the other way and it converts a draw back into milligrams, which is how the second table below is built.
What one unit holds at each volume
| Bac water added | Concentration | 1 unit holds | 10 units | 50 units |
|---|---|---|---|---|
| 1 mL | 10 mg/mL | 0.1 mg (100 mcg) | 1 mg | 5 mg |
| 2 mL | 5 mg/mL | 0.05 mg (50 mcg) | 0.5 mg | 2.5 mg |
| 3 mL | about 3.33 mg/mL | about 0.033 mg (33 mcg) | about 0.333 mg | about 1.667 mg |
The vial holds 10mg at every volume in this table. Only the concentration moves.
The same arithmetic in reverse: what a draw carries
This table reads from the syringe, not toward it. Melanotan 2 has no approved dose, so there is no list of amounts that would be honest to print down the left-hand column. What is honest, and more useful at the bench, is the conversion in the other direction: a given draw on a U-100 syringe carries this much peptide at each concentration.
| Draw on a U-100 syringe | Mixed with 1 mL | Mixed with 2 mL | Mixed with 3 mL |
|---|---|---|---|
| 5 units | 0.5 mg (500 mcg) | 0.25 mg (250 mcg) | about 0.167 mg (167 mcg) |
| 10 units | 1 mg (1,000 mcg) | 0.5 mg (500 mcg) | about 0.333 mg (333 mcg) |
| 20 units | 2 mg | 1 mg | about 0.667 mg |
| 50 units | 5 mg | 2.5 mg | about 1.667 mg |
Two limits the arithmetic does not know about. A single 1 mL U-100 syringe holds 100 units, so a 2 mL or 3 mL mix takes more than one syringe of water going in. And a count under about 5 units sits in the hardest part of the barrel to read, which is where a slow draw and a checked tick matter most.
Cross-check against our own worked examples
Two figures already published on this site fall straight out of the table above, which is a useful check that the formula is being applied the same way everywhere. Our reconstitution quick-reference works the 10mg vial at 2 mL, where 0.5 mg is 10 units. Our Melanotan 2 complete guide works the same 2 mL, where 250 mcg is 5 units. Both are the same formula at the same concentration, and both are worked examples of the conversion rather than amounts addressed to any reader.
How much bac water should go in
It depends, and the honest version of that answer is short: the volume sets the concentration and nothing else. Every Peptara reference works the vial we ship at the standard 2 mL; guides elsewhere pick other volumes, and the arithmetic on this page covers any of them. Three things decide which volume makes sense for a given vial.
Readability of the draw
More water means each unit carries less peptide, so the same amount becomes a larger unit count that is easier to read on the barrel. Less water means smaller draws.
What the syringe can take
A 1 mL U-100 syringe holds 100 units. Dilute far enough and a single draw stops fitting in one syringe, which is a practical ceiling on volume.
What the vial can hold
Check the vial physically takes the volume before you draw it. A volume that does not fit forces an improvised mix, and every unit count calculated from the intended volume is then wrong while still looking authoritative.
How much Melanotan 2 do I need, and why this page will not answer that with a number
It is the most searched question about this compound, so it deserves a straight answer rather than a silence. The straight answer has two halves and neither of them is a figure for any individual reader.
The arithmetic half is fully answerable, and it is the whole of this page. Given a vial strength and a water volume, the formula converts in both directions: an amount in milligrams becomes a count of units on the syringe, and a count of units becomes an amount in milligrams. That is the part a calculator can do, and ours does it for any strength and any volume.
The research half is where the honest answer is a negative one. Melanotan 2 is not approved by a major regulator, human safety data is limited, and there is no approved dose to convert toward. The contrast with the approved member of the same family is instructive: afamelanotide is delivered as a fixed 16 mg implant placed by a trained clinician roughly every two months, a product specification rather than something an individual titrates (Scenesse prescribing information; FDA approval, 2019). Nothing equivalent exists on the Melanotan 2 side, and a research-use page that invented one would be making it up.
So the arithmetic is here in full, and the decision it feeds belongs with a qualified clinician. For any other vial strength or volume, the peptide reconstitution calculator runs the same two formulas.
Storage, before and after
Before reconstitution
Stable at room temperature
Lyophilized Melanotan 2 powder is stable at room temperature, away from direct sunlight and heat, and can be refrigerated for longer storage. Keep the vial sealed until the day you mix it.
After reconstitution
Refrigerate immediately
Once mixed, store the vial at 2 to 8 Celsius and use within about 30 days. Inspect before each draw: the solution should be clear, and a cloudy or discolored one should be discarded rather than used.
Write it on the vial
The volume you actually added is the one number every later calculation depends on, and nothing on the vial records it. Write it on the label at the moment you mix, along with the date, and the arithmetic stays checkable weeks later. On a compound our own material works at two different volumes, that label is doing more work than usual.
Six mistakes worth avoiding
Shaking instead of swirling
Shaking foams the solution and can fragment the peptide. Roll or swirl until clear, and give it the full 30 to 60 seconds.
Firing the water straight onto the powder
Angle the needle so the stream runs down the inside of the glass. Hitting the freeze-dried cake directly is rough on the peptide and clouds the solution.
Carrying a unit count over from a different volume
This is the MT-2 specific trap, because guides around the web work the 10mg vial at anything from 1 mL to 3 mL, while every Peptara reference uses 2 mL. A count written for one volume is wrong at another, and it looks just as authoritative either way. Recalculate.
Reading mL where the syringe says units
This is the error that produces 10x mistakes. A U-100 syringe is marked in units, 100 units to 1 mL. Keep every figure except the bac water volume in units.
Using a U-40 syringe by accident
U-40 is a different scale entirely and will not match any unit count worked out for U-100. A half-cc U-100 syringe holds 50 units and is fine; U-40 is not.
Mixing before the precautions are handled
Our MT-2 material names two that come before the first vial is ever opened: document existing moles, because MT-2 is reported to darken moles and freckles, and monitor blood pressure. Anyone with a personal or family history of melanoma or atypical moles should not use it and should see a dermatologist.
Keep reading
The calculator, the product vial, and the method behind the numbers
Peptide reconstitution calculator
The same two formulas as a tool, for any vial strength and any volume.
Melanotan 2 (MT-2)
The 10mg vial this page does the arithmetic for, with its batch COA.
How to reconstitute peptides
The general method for every compound in the catalog, plus a live calculator.
Melanotan 2 complete guide
Mechanism, the mole and blood-pressure precautions, storage and cautions.
MT1 vs MT2
How melanotan 1 and melanotan 2 differ by receptor and by regulatory status.
Units vs mg
Why the syringe reads in units and the vial reads in mg.
Peptide glossary
Plain definitions for bac water, lyophilized, diluent, and the rest.
Reconstituting Melanotan 2: FAQ
How do I reconstitute a 10mg Melanotan 2 vial?
The method is the same as for any lyophilized peptide: bring the vial to room temperature, wipe both stoppers with alcohol, draw the planned volume of bacteriostatic water into a U-100 insulin syringe, add it slowly down the inside glass wall, and swirl until clear. Then refrigerate. The part specific to a 10mg vial is the arithmetic that follows. 10mg into 1 mL gives 10 mg per mL, so one insulin unit holds 0.1 mg. 10mg into 2 mL gives 5 mg per mL, so one unit holds 0.05 mg. 10mg into 3 mL gives about 3.33 mg per mL, so one unit holds about 0.033 mg. The volume changes the unit count, never the amount of peptide in the vial.
How much Melanotan 2 do I need?
That question has an arithmetic answer and a research answer, and neither of them is a figure for any individual reader. The arithmetic: units = (amount in mg / vial strength in mg) x (bac water in mL x 100), so on a 10mg vial mixed with 2 mL, one unit on a U-100 syringe carries 0.05 mg, and the same vial mixed with 1 mL carries 0.1 mg per unit. That formula converts between an amount and a draw in either direction. The research: Melanotan 2 is not approved by a major regulator, there is no approved dose to convert toward, and human safety data is limited, so nothing published functions as a target. The related approved melanocortin products show how far apart these two things are, since afamelanotide is delivered as a fixed 16 mg implant placed by a clinician rather than a self-selected amount (Scenesse prescribing information; FDA approval, 2019). Peptara Labs does not provide dosing instructions, and any decision about use belongs with a qualified clinician.
How much bacteriostatic water goes into a 10mg MT-2 vial?
It depends on the unit count you want to read on the syringe, because the volume sets the concentration and nothing else. The Peptara standard is 2 mL: both our reconstitution quick-reference and the MT-2 complete guide work the 10mg vial at 2 mL. More water means each unit carries less peptide, so the same amount becomes more units on the barrel, which is easier to read accurately. Less water means smaller draws. Two practical limits: the vial has to physically hold the volume you plan to add, and a single 1 mL U-100 syringe only holds 100 units, so a 2 mL or 3 mL mix is more than one syringe of water going in.
How many units is 250 mcg of Melanotan 2 at each mixing volume?
It is pure conversion, and the answer moves with the volume. 250 mcg is 0.25 mg. On a 10mg vial mixed with 1 mL the solution is 10 mg per mL, so 0.25 mg is 2.5 units. Mixed with 2 mL it is 5 mg per mL, so 0.25 mg is 5 units. Mixed with 3 mL it is about 3.33 mg per mL, so 0.25 mg is 7.5 units. The 2 mL figure is the worked example that already appears in our MT-2 complete guide. It is arithmetic shown to demonstrate the conversion, not an amount addressed to any reader.
Why do different guides show a 10mg MT-2 vial mixed at different volumes?
Because the volume is a choice rather than a property of the vial, and different worked examples pick different ones. Both Peptara references, the reconstitution quick-reference and the MT-2 complete guide, work the 10mg vial at the standard 2 mL; guides from other sources pick 1 mL or 3 mL. Each choice is arithmetically valid and describes the same 10mg of peptide; they simply produce different concentrations and therefore different unit counts for the same amount. This is the single most common source of confusion in peptide arithmetic, and the fix is boring: write the volume you actually used on the vial, and recalculate rather than carrying a unit count over from a guide that used a different volume.
How long does reconstituted Melanotan 2 keep, and how should it be stored?
Before reconstitution the lyophilized vial is stable at room temperature, away from direct sunlight and heat, and can be refrigerated for longer storage. After reconstitution, refrigerate at 2 to 8 Celsius and use within about 30 days. Inspect the vial before each draw: the solution should be clear, and a cloudy or discolored solution should be discarded rather than used.
Does Melanotan 2 have an approved dose to reconstitute toward?
No. Melanotan 2 is not approved by a major regulator for any use, so there is no approved dose and no labeling to work back from. That is why the tables on this page are drawn in units first and read forwards to milligrams: they show what a given draw carries at a given concentration, which is arithmetic, rather than presenting a list of amounts that would read as a schedule. Any decision about use belongs with a qualified clinician.
References
- U.S. Food and Drug Administration. Scenesse (afamelanotide) implant, prescribing information; FDA approval, October 8, 2019. Cited here only for the contrast between an approved product specification and a research compound with no approved dose.
General educational information only, research-use framing, not medical advice. Melanotan 2 is not approved by a major regulator and has no approved dose. Consult a qualified professional before acting.