Melanotan I: the complete guide.

The short version.

If you read nothing else, read this. The whole guide in a handful of bullets.

Quick reference.

What is Melanotan I?

Melanotan I is a short peptide, which simply means a small chain of amino acids, the same building blocks that make up the proteins in your body. It is a synthetic copy of alpha-melanocyte-stimulating hormone, or alpha-MSH, a natural hormone your body already makes.

Alpha-MSH is the signal that tells the pigment cells in your skin, called melanocytes, to produce melanin. Researchers built a more stable, longer-lasting version of that signal, and Melanotan I is the lab-made result. When it reaches the skin's pigment cells, it switches on the production of eumelanin, the darker and more protective form of melanin.

The version sold by vendors arrives as a freeze-dried white powder in a small sealed vial. It is not a steroid, not a stimulant, and not a sex drug, although it sits in the same melanocortin family as peptides that are. People reach for it for one theme above all: getting a tan with less time in the sun, and doing it with fewer side effects than its better-known sibling, Melanotan II.

Worth saying plainly: Melanotan I is not an approved tanning medicine anywhere. It is sold strictly for research use only. The closest real human evidence is on a related compound, afamelanotide, which is approved only for a rare light-sensitivity disorder and not for cosmetic tanning. We get into what that means further down.

How it works in the body.

You do not need a biology degree to follow this. Here is the simple picture, then a little more for the curious.

The core idea is that Melanotan I borrows your skin's own tanning system. Instead of damaging your skin into a tan with extra UV, it turns up the pigment signal so your skin responds to less sun. It does this through a few overlapping mechanisms that show up in the research on melanocortins.

• MC1R activation. Melanotan I binds the melanocortin-1 receptor on pigment cells, the same receptor alpha-MSH uses. This is the master switch for making eumelanin, the darker, more protective melanin.
• More selective than MT-II. Melanotan I is relatively selective for MC1R and touches the MC3R and MC4R pathways less. Those other receptors are tied to appetite, nausea, and sexual arousal, which is why MT-I is associated with a cleaner tan and fewer of those effects.
• Effect outlasts the drug. The peptide clears the blood within hours, but the tan keeps developing. Once melanocytes are switched on they keep depositing pigment, which is why dosing every few days is enough rather than every single day.

How to take it: routes of administration.

Melanotan I is an injectable peptide. It is not a meaningful oral or nasal option, so in practice the only route that matters is a subcutaneous injection. Here is the honest comparison.

Where to inject.

If you go this route, these are the sites people use. Rotate so no single area gets sore.

The easiest spots are the belly (about 2 inches either side of the navel), the love handles, the front of the thigh, and the back of the upper arms. Rotate every injection.

So which should a beginner pick? For everyone, subcutaneous is the answer: absorption is reliable, the needle is tiny, and because the pigment signal works through the whole body, you do not need to inject anywhere special. Intramuscular and the various sprays are not worth chasing.

Reconstitution: mixing it.

Melanotan I arrives as a dry powder, so before you can inject it you reconstitute it, which just means adding liquid to turn the powder into something you can draw into a syringe. It sounds technical but takes about a minute.

Once it is mixed, the only real question is how many units to draw. Because the dose is in micrograms, the units are small and easy to misread by hand, so the calculator is worth using.

• Use bacteriostatic water, often called BAC water. The small amount of preservative keeps the mixed vial usable for weeks.
• Add the water slowly, down the inside wall of the vial. A common mix is a 10 mg vial plus 2 mL of BAC water, which gives a concentration of 5 mg/mL.
• Swirl, do not shake. Gently roll the vial until the powder dissolves. Shaking can damage the peptide.
• Store it in the fridge once mixed, and keep it out of direct light.

Open the dosage calculator to turn your vial and dose into an exact number of units. As a worked example: a 10 mg vial mixed with 2 mL of BAC water gives 5 mg/mL, so a 250 mcg dose is 0.05 mL, which is just 5 units on a U-100 insulin syringe, and that vial holds about 40 doses.

Dosing by goal.

There is no single official dose for Melanotan I, because it is not an approved tanning medicine. What follows is the range people commonly run, organized by phase. The defining feature is the loading-then-maintenance pattern, paired with regular UV exposure.

Loading phase

The most common starting pattern is about 250 mcg twice a week, for roughly four weeks, alongside regular but sensible UV exposure. The idea is to build the tan while the skin is being primed to make pigment. Many people start at a lower test dose first to gauge how they react.

Maintenance phase

Once the color you want has developed, people typically drop to about 250 mcg once or twice a week to hold it, rather than continuing at the loading frequency. The tan fades if you stop, since pigment turns over normally.

Timing the dose

Because any nausea or facial flush tends to peak in the first hour or two after a dose and pass within a few hours, some people inject in the evening so they can ride out the mild effects while resting. UV exposure is what develops the tan, not the time of the injection.

Cycling and timing.

A cycle just means a defined run of time on the peptide, followed by a break. For Melanotan I the common pattern is a loading phase of roughly four weeks with UV exposure, then a lighter weekly maintenance dose while you want to keep the color, then time off, rather than running it indefinitely.

Why not just run it forever? Mostly because the long-term human safety data does not exist for cosmetic use, and ongoing melanocortin stimulation is not something anyone has studied for years on end in healthy people. The cautious approach is to run a focused block, then stop.

• Start low with a small test dose to see how you react before holding a regular schedule.
• Pair it with sensible UV, not extreme sun. The point of a protective tan is undermined if you burn chasing it faster.
• Take a real break after a cycle and let the tan fade. Watch your skin: new or changing moles are a reason to stop and see a provider.

Stacking Melanotan I.

Melanotan I is usually run on its own for tanning. A couple of combinations come up, but mostly people compare it against its sibling rather than stack it.

See full recipes, dosing, and how people run them on the stacks page.

Side effects and safety.

In the reports we see, Melanotan I's side effects show up in a meaningful share of users and are usually mild and short-lived, peaking in the first hour or two after a dose. The ones people mention most often are:

• Nausea, the most commonly reported effect, usually fading within a few hours of the dose.
• Facial flushing or a warm, red feeling shortly after injecting.
• Injection-site irritation, a little redness or a small bump, which is why rotating sites matters.
• Darkening of moles and freckles, and overall skin darkening, which is the intended effect but worth watching closely for any new or changing spots.

Who should be cautious.

Some people have clear reasons to be extra careful, or to avoid Melanotan I entirely until they have spoken with a licensed provider.

• Pregnant or breastfeeding. There is no safety data here, so this is a hard avoid.
• A history of melanoma or many atypical moles. Melanotan I darkens moles and the long-term skin-cancer picture is unsettled, so this is a conversation for a dermatologist, not a forum.
• Competing athletes. Melanocortin agonists are banned by WADA and can show up as prohibited substances.
• Anyone on other medications or with heart or blood-pressure issues. Melanocortins can transiently raise blood pressure, so talk to your provider first.

And the universal one: whoever you are, talk to a licensed healthcare provider, and ideally have a dermatologist check your skin, before starting Melanotan I. This guide is educational, not a substitute for personalized medical advice.

Where to buy it safely.

This is where a lot of beginners get burned, because peptide quality varies wildly between vendors and the cheapest vial is not always the real deal. Our honest take: do not shop on price alone, shop on price plus independent lab data.

• Compare vendors side by side. Price ranges are wide, and the difference between the lowest and highest listing can be large for the exact same compound.
• Look for recent third-party lab tests. The gold standard the community looks for is a recent Janoshik certificate of analysis showing purity for the batch you are actually buying.
• Confirm it is MT-I, not MT-II. The two are easy to mix up in listings, and they are not interchangeable. Check the name and the COA match what you want.
• Be skeptical of suspiciously cheap listings with no testing behind them, and avoid the unregulated nasal sprays entirely.

That is exactly the comparison we put together. On our Melanotan I product page you can compare vendor prices, see which batches have public lab data, and view the grades we assign from that data. From there you can head to the buy page to line up your options.

Questions, answered straight.