Melanotan 2 (Melanotan II, MT-2) arrives as a white lyophilized powder, almost always in a 10 mg vial. It has to be reconstituted with bacteriostatic water before use. The mixing procedure is the same as any other peptide, but the dose range is unusually small: a typical loading dose is 250 mcg, which is one fortieth of a 10 mg vial. That makes your choice of BAC water volume matter more here than it does with a GLP-1 peptide dosed in milligrams.
What You Need Before You Start
- Melanotan 2 vial (10 mg is the standard size, 5 mg vials also exist)
- Bacteriostatic water, ideally a 30 mL multi-dose vial
- U-100 insulin syringes, 0.3 mL or 0.5 mL barrel, 29 to 31 gauge
- A 3 mL syringe with a longer needle for transferring the BAC water (optional but easier)
- Alcohol swabs
- A refrigerator, plus a label or marker for the reconstitution date
Let the vial reach room temperature before you add anything. Cold glass plus room-temperature water can leave powder clinging to the vial wall above the fluid line, which costs you dose accuracy on the first few draws.
Choosing Your BAC Water Volume
The BAC water volume sets your concentration, and concentration sets how many syringe units a 250 mcg dose works out to. Because Melanotan 2 doses sit at the low end of an insulin syringe, the goal is to pick a volume where your usual dose lands on a whole unit mark rather than between two of them.
- 10 mg vial + 4 mL BAC water = 2.5 mg/mL. 125 mcg = 5 units, 250 mcg = 10 units, 500 mcg = 20 units. This is the easiest option to read and the one most beginners should pick.
- 10 mg vial + 2 mL BAC water = 5 mg/mL. 125 mcg = 2.5 units, 250 mcg = 5 units, 500 mcg = 10 units. Half the injection volume, but 2.5 units is a fiddly mark to hit on a 0.3 mL syringe.
- 10 mg vial + 5 mL BAC water = 2 mg/mL. 250 mcg = 12.5 units, 500 mcg = 25 units. Very forgiving to measure, though a 5 mL fill needs a vial with enough headspace.
- 5 mg vial + 2 mL BAC water = 2.5 mg/mL. Same unit math as the 10 mg in 4 mL option, so protocols transfer directly.
Step-by-Step Reconstitution
- Wipe the rubber stopper on both the Melanotan 2 vial and the BAC water vial with an alcohol swab, then let them air dry rather than fanning or blowing on them.
- Draw your chosen volume of bacteriostatic water into a syringe. For 4 mL you will need either a 5 mL syringe or two passes with a 3 mL syringe.
- Insert the needle through the stopper at roughly a 45-degree angle, with the bevel facing the glass wall of the vial.
- Depress the plunger slowly so the water runs down the inside wall. Do not spray it directly onto the powder cake, which foams the solution and can shear the peptide.
- Withdraw the needle and let the vial sit for 30 to 60 seconds. Most of the powder dissolves on its own.
- Swirl gently, or roll the vial between your palms. Never shake it.
- Inspect the result. Correctly reconstituted Melanotan 2 is clear and colorless with no particles, cloudiness, or floating fibers.
- Write the reconstitution date and the concentration in mg/mL directly on the vial, then refrigerate it.
Converting Your Dose Into Syringe Units
On a U-100 insulin syringe, 100 units equals 1 mL, so 1 unit is 0.01 mL. To get units, divide your dose in mg by the concentration in mg/mL to get volume in mL, then multiply by 100. A 250 mcg dose is 0.25 mg, so at 2.5 mg/mL that is 0.1 mL, which is 10 units.
You do not have to run that arithmetic yourself. The Melanotan 2 calculator comes preloaded with a 10 mg vial and a 250 mcg dose, and the general peptide reconstitution calculator handles any vial size and BAC water volume you enter, with a live syringe diagram showing where to stop the plunger.
Dosing After Reconstitution
Standard self-directed protocols start with a 125 mcg tolerance dose on day one, taken in the evening. Nausea and facial flushing are the dose-limiting effects and they hit hardest on the first few exposures, so a half dose is the normal way to find out how you react. From there, 250 mcg once daily for one to two weeks is the usual loading phase, with some users pushing to 500 mcg daily as tolerance builds.
Once the target tone is reached, typically after a cumulative 5 to 10 mg of exposure, maintenance drops to 500 mcg to 1 mg once or twice weekly. The reason the schedule can loosen this much is that the plasma half-life (roughly an hour) tells you nothing useful about duration: melanin, once produced, persists for weeks. Pigmentation is also not immediate, and it usually takes UV exposure plus somewhere between 7 and 14 days to show.
Storage and Shelf Life
Lyophilized Melanotan 2 is stable for months refrigerated at 2 to 8°C, or longer frozen, as long as it stays dry and out of direct light. Once you add bacteriostatic water, refrigerate at 2 to 8°C and plan to use the vial within 28 days, which is the limit set by the benzyl alcohol preservative in the BAC water rather than by the peptide itself.
Do not freeze reconstituted solution, and avoid repeated freeze-thaw cycles, both of which degrade peptide structure. Check the vial before every draw. Cloudiness, particulates, or any color change means the vial goes in the sharps bin, not into a syringe.
The Safety Check Most Guides Skip
Melanotan 2 stimulates melanocytes systemically, which means it acts on every mole you have, not only on the skin you want tanned. Published case reports document eruptive melanocytic nevi, rapid darkening of pre-existing nevi, and changes in nevus morphology after use, including one report of new nevi appearing within 24 hours of a single injection.
One more point worth stating plainly: Melanotan 2 is not sunscreen. It does not block UV, and the pigmentation it produces should not be treated as meaningful photoprotection. It has never been approved for any indication in any country, and essentially all material in circulation is unregulated and sold for research purposes only.
Melanotan 2 vs PT-141
PT-141 (bremelanotide) is the deaminated metabolite of Melanotan 2. It keeps the MC4R-mediated sexual arousal effect while producing far less MC1R-driven pigmentation, which is what made it developable as an actual drug: the FDA approved it in 2019 for hypoactive sexual desire disorder in premenopausal women. If arousal rather than tanning is the goal, PT-141 is the more selective compound with real trial data behind it.