Melanotan II guide & protocols

Melanotan II does several things at once, and that is both why people want it and the whole problem with it. It darkens skin, it raises sexual desire, and it suppresses appetite, because it hits several melanocortin receptors rather than one. The pharmaceutical industry's response to that was to build a cleaner version that does only the libido part, and that compound is now an approved drug for women. This page covers what people run on the original, and it is also the one page on this site where we're going to be firm about a specific thing to watch.

Vial size isn't part of what follows, since the amount of bacteriostatic water you add sets your concentration either way. Our reconstitution calculator handles that math for whatever vial and target amount you're working with.

What it is

Melanotan II is a synthetic version of alpha-MSH, the hormone that tells the pigment cells in your skin to produce melanin. The natural hormone is fragile and short-lived; this version was engineered to survive and to hit its receptors harder.

The complication is that the melanocortin receptor family has several members doing very different jobs. One handles pigment. Another sits in the brain and is involved in sexual arousal. Another is involved in appetite. Melanotan II activates all of them, which is why a compound bought for a tan also changes libido and appetite, whether or not that was the plan.

That lack of selectivity is exactly what led to PT-141. Researchers took this molecule, cut it down, and produced something that acts on the arousal pathway without the pigment effect. PT-141 went on to be approved for low sexual desire in premenopausal women. So Melanotan II is, in a real sense, the rough draft of a drug that exists.

What people use it for

Tanning, mostly, and specifically tanning without the sun. The appeal is obvious for anyone who burns rather than browns, and the effect is real and visible in a way almost nothing else on this site is. That visibility is part of why it has the reputation it does.

Libido is the second reason, and for a lot of women it's the actual reason with tanning as the cover story. It's worth saying plainly that if desire is what you're after, there's a refined version of this compound with an approval behind it and far fewer side effects, and it's covered below.

Appetite suppression comes along whether you wanted it or not, and some people count it as a benefit. It tends to fade after the first weeks.

Formulations

Melanotan II ships as a lyophilized powder for subcutaneous injection, and the market has settled on one size almost completely: 10 mg vials, from nearly every vendor we track.

Nasal sprays circulate for this compound as they do for several others. How much of a nasal dose actually gets absorbed hasn't been measured, so the injected amounts below don't carry across, and the dose-per-spray problem covered on our semax page applies here too.

Dosing protocols

Melanotan II is dosed in two phases, which is unusual on this site and reflects that the effect people want is cumulative rather than immediate. Nothing here comes from an approved product; the compound was never approved anywhere.

See the Melanotan II research notes for the research behind these figures.

All patterns above are subcutaneous injection. Evening dosing is convention, on the grounds that it puts the nausea into sleep.

The skin check, and we're going to be direct about this

This site does not lecture and does not gatekeep. This is the one place we make an exception, because the mechanism gives a specific, checkable reason for concern rather than a general shrug.

Melanotan II tells pigment cells to become more active. Moles are collections of pigment cells. So moles commonly darken, and new ones commonly appear, and that is the expected pharmacology rather than a surprise. The genuine difficulty is that a mole changing is also the main way melanoma announces itself, and this compound produces exactly that signal on purpose. Case reports of melanoma in users exist. Nobody has shown the compound caused them, and nobody has shown it didn't.

What follows from that is practical rather than dramatic. Photograph your moles before you start, so you have a baseline that isn't your memory. Know what you already have. If something changes shape, edge or colour unevenly, that gets looked at by a dermatologist, and the dermatologist gets told you're using this, because a doctor assessing a changing mole should know the person has been chemically instructing their pigment cells for months. That last part is the bit people skip, and it's the bit that matters.

Amount total, for planning your vial purchase. A three-week loading phase at 500 mcg daily uses 10.5 mg, so a single 10 mg vial is very close to one full loading phase. Maintenance at 1 mg weekly then runs about 4 mg a month, so the second vial lasts roughly two and a half months. This is a cheap compound to keep going once you're past the start.

How much to reconstitute at once. A reconstituted vial keeps about 28 days refrigerated, and loading at 500 mcg daily uses a 10 mg vial in twenty days, so the window doesn't bind during loading. On maintenance it very much does: at 1 mg weekly a 10 mg vial would take ten weeks, so mix less at a time or accept the waste. Working example: 10 mg into 2 mL of bacteriostatic water gives 5,000 mcg per mL, so 500 mcg is 500 divided by 5,000, times 100, which is 10 units on a standard U-100 insulin syringe, and 250 mcg is 5 units. See how much to reconstitute at once for the general math.

Cycling guidelines

The structure here isn't really a cycle, it's a loading phase followed by maintenance for as long as you want to keep the colour, and colour fades over weeks once you stop. People commonly load seasonally, ahead of summer or a trip, and let it lapse afterwards.

There's no tolerance mechanism described, so breaks aren't about restoring response. The argument for not running it continuously for years is the skin one above, and it's the honest reason rather than a pharmacological one.

Signs a course is commonly stopped or reconsidered:

• Any mole that changes shape, edge or colour, or a new one that looks different from your others. This is the one on the list that isn't about comfort.
• Nausea or flushing that doesn't settle after the first week
• Darkening that goes further or more unevenly than wanted, since it's easier to stop than to reverse
• In men, spontaneous erections, which are common early and are the effect PT-141 was built around

Stacking

The honest answer is that this compound is usually run alone.

Where PT-141 comes up: not as a stack but as a replacement. Running both is doubling the arousal pathway for no reason, since Melanotan II already covers it. If libido is the goal, PT-141 alone is the better-designed tool.

Where GHK-Cu comes up: on the skin side, and the two are doing unrelated things. GHK-Cu is about the structure of skin, Melanotan II is about its colour. Neither interferes with the other, and neither helps the other.

Combinations to approach carefully: anything else affecting blood pressure. Melanotan II can raise it transiently, and PT-141 carries the same effect more prominently. Anyone on blood pressure medication should treat that as a real consideration rather than a footnote.

Expected results timeline

First few days: nausea and facial flushing, if anything, rather than colour. This is the phase people find unpleasant and it's why the cautious start exists.

One to three weeks: colour begins to appear, gradually. It builds faster with some sun exposure than without, since the compound increases the pigment response rather than replacing the trigger entirely.

Ongoing: once the colour is where you want it, maintenance holds it. Stopping lets it fade over several weeks.

What to expect realistically: the tanning effect is real, reliable and visible, which makes this one of very few compounds on this site where you can tell whether it worked. Everything else about it is less settled. The libido effect is real but comes with the rest of the package. And the pigment effect that makes it work is the same one that makes the skin caution above genuine rather than boilerplate.

Administration technique

1. The lyophilized powder is reconstituted with bacteriostatic water, at a concentration set by the reconstitution calculator for the target amount.
2. The solution is swirled gently to dissolve rather than shaken, since agitation can degrade the peptide.
3. The calculated volume is drawn into an insulin syringe, which at 5 to 10 units is the only thing that measures this accurately.
4. A subcutaneous site is chosen, commonly the abdomen, with sites rotated day to day.
5. The skin is pinched and the injection given at roughly a 45-degree angle.
6. The dose is commonly given in the evening, which is convention with a practical basis: it places the nausea and flushing into sleep rather than into the working day.
7. Baseline photographs of existing moles are commonly taken before starting, for the reason set out above.

Side effects and safety

Common: nausea and facial flushing in the first days, which is the most consistent report and the reason for starting low. Darkening of existing moles and freckles, which is expected pharmacology. Appetite suppression. In men, spontaneous erections.

Less common: a transient rise in blood pressure, dizziness, and darkening of skin in places nobody wanted it, particularly the face and existing marks.

The one that matters: changes in moles. Set out in full above rather than buried here, because it's the reason this compound is different from the others on this site.

What we don't know: whether long-term use raises skin cancer risk. There are case reports of melanoma in people using it and no study designed to answer the question, so the honest position is that the concern is biologically plausible, unproven, and not going to be resolved by anyone in the near future. Nobody is running that study.

Contraindications: a personal or family history of melanoma or significant atypical moles is where this compound stops being a reasonable thing to take. Pregnancy, breastfeeding and use in minors have no data. Uncontrolled high blood pressure is worth taking seriously given the transient pressure effect.

Drug interactions: blood pressure medication is the practical one. Nothing else established.

Melanotan II vs. PT-141

These two are the same lineage, and the comparison is unusually clear-cut because one was literally built to fix the other's problems.

Choose Melanotan II if: the colour is the actual goal, and you're prepared to take the skin caution seriously.

Choose PT-141 if: desire is the goal. It's the refined version, it's dosed only when you need it, and it's the one with an approval specifically in women. There is no good reason to take the rough draft for a job the finished drug does better.

See the PT-141 guide and protocols for its own dosing.

Storage and handling

Lyophilized powder: refrigerate at 2 to 8°C and protect from light. Kept frozen, the unreconstituted powder is commonly described as stable considerably longer, which is the practical answer to the maintenance phase where a vial outlasts its own window.

Reconstituted solution: refrigerate and use within about 28 days. Some vendors quote four to six weeks for this compound; the shorter figure is the safer planning number.

Signs of degradation:

• Cloudiness or visible particles in a solution that was previously clear
• Discoloration of the powder or the reconstituted liquid
• Colour that stops holding at an unchanged maintenance amount, which is a soft signal but a legible one on this compound specifically

FAQ

Do I still need sun? It works faster with some exposure, because it raises the pigment response rather than replacing the trigger. It does not make you safe in the sun, and burning is still burning.

How much do people run? 250 to 500 mcg daily while loading, then 500 mcg to 1 mg once or twice weekly to hold it.

Why does everyone say start low? Nausea and flushing, which are common at the start and much worse at a full amount. Evening dosing for the same reason.

Will it darken my moles? Commonly yes, and that's expected. It's also why the skin section above exists, and why a baseline set of photographs before you start is genuinely worth the ten minutes.

Does it cause melanoma? Unknown. Case reports exist, no study has been designed to answer it, and the mechanism makes the question reasonable rather than paranoid.

Melanotan II or PT-141? Tan, Melanotan II. Libido, PT-141, which is the refined version and is approved for exactly that in women.

Will it suppress my appetite? Commonly yes, especially early, and it tends to fade.

How long does the colour last? It fades over several weeks after stopping.

Bottom line

Key dosing takeaways:

• Two phases: 250 to 500 mcg daily to load, then 500 mcg to 1 mg weekly to hold, with evening dosing to put the nausea into sleep
• A 10 mg vial is close to one full loading phase, and maintenance afterwards is cheap
• No approved product and no established regimen exist; the research moved on to the refined version instead

Best practices:

• Photographing your moles before you start, and telling any dermatologist you see that you're using this
• Starting at the low amount for the first few days rather than the full one
• Mixing only what maintenance will use inside 28 days, rather than a full vial

Works best for people who:

• Actually want the pigment effect, rather than wanting one of the side effects
• Have no personal or family history of melanoma or atypical moles
• Will take the skin monitoring seriously rather than treating it as boilerplate

Melanotan II is sold for research, it has never been approved anywhere, and the pigment effect people buy it for is the same one behind the skin caution on this page. You already know that. You're an adult making an informed call about your own body, and that's yours to make.