Three different compounds get called melanotan, and the difference between them is not academic. One is a licensed prescription medicine. One is approved for something entirely unrelated to tanning. The third is the one everyone actually buys, and it has never been submitted for approval anywhere.
| What it is | Status | |
|---|---|---|
| Melanotan I afamelanotide, Scenesse | Linear peptide, highly selective for the MC1R receptor | FDA approved, October 2019, for phototoxic reactions in erythropoietic protoporphyria. A rare disease drug, not a tanning product. |
| Melanotan II MT2 | Cyclised peptide, hits MC1R, MC3R, MC4R and MC5R without selectivity | Never submitted for approval. This is what is sold as a tanning peptide, ours included. |
| Bremelanotide Vyleesi | Derived from Melanotan II, developed away from pigmentation | FDA approved for low sexual desire in premenopausal women. |
So the family has produced two licensed drugs, and the one people inject for a tan is not either of them. Worth knowing before you read anyone describing MT2 as a medicine.
Why one peptide does four unrelated things
Melanotan II is an analogue of alpha-MSH, the hormone your own body uses to signal pigment production. The natural version is fairly targeted. MT2 is not. It activates four melanocortin receptors at once, and each one explains a different effect people report.
| Receptor | What it controls | What you notice |
|---|---|---|
| MC1R | Melanin production in the skin | The tan. The reason anyone buys it. |
| MC3R / MC4R | Appetite and sexual arousal | Reduced appetite, and spontaneous erections |
| MC5R | Sebaceous gland activity | Oilier skin, sometimes acne |
That last column is the honest answer to why MT2 has such a strange side effect list. None of it is a contaminant or a bad batch. It is one molecule pressing four buttons because it was never refined to press only one. Afamelanotide was refined that way, which is exactly why it got approved and MT2 did not.
What it does to your skin, and what it does not
MT2 raises melanin production, so you pigment faster and darker than you otherwise would. What it does not do is replace the sun.
Melanogenesis still needs a UV trigger. In practice that means MT2 gets you colour with less exposure than you would otherwise need, not with none. Anyone describing it as a tan without UV is overstating it, and that includes some of the copy floating around this industry.
The part that matters most
This is not a footnote and it is the reason dermatology bodies have been vocal about MT2 specifically.
MT2 darkens existing moles and commonly produces new ones. Pigmented lesions change quickly, freckles appear in places you did not have them, and existing naevi go darker and sometimes larger.
The danger is not just the change itself. It is that changing moles are the primary early warning sign of melanoma, and MT2 makes every mole on your body change at once. The signal you would normally use to catch something early gets buried in noise.
Case reports document melanoma developing in MT2 users, and the Skin Cancer Foundation has issued a formal warning about it. DermNet has a clinical summary if you want the dermatology view rather than ours.
If you use it anyway, the one thing worth doing is straightforward. Photograph your moles before you start. Full body, good light, close-ups of anything already irregular. That gives a dermatologist a real baseline instead of asking them to judge a mole that has been changing for six months with no reference point. Book a skin check annually and tell them you have used it.
We would rather sell to someone who does that than to someone who finds out about it later.
The rest of the side effects
Nearly all of it lands in the first few days and settles as the body adjusts.
- Nausea and flushing. The most common complaint, worst in the first hour after a dose and worst at the start. Most people report it fading within a week or two.
- Spontaneous erections. Not a rumour and not an exaggeration, this is MC4R activation and it is the effect bremelanotide was built around. Frequently reported in the first few days.
- Appetite suppression. Some people find this a benefit. It is the same receptor family, not a separate mechanism.
- Darkening in places you did not expect. Lips, gums, scars, palms, existing freckles. Pigmentation is systemic, not local.
- Oily skin and breakouts. MC5R. Common and usually mild.
Where it stands in Canada
Melanotan II is not authorised by Health Canada. No DIN, no pharmacy, no prescription route. It reaches buyers here the way the rest of this category does, labelled for research rather than for people.
The practical consequence worth understanding is purity. There is no regulated manufacturing standard behind an unapproved peptide, so what is in the vial depends entirely on who made it. Ask for a certificate of analysis with a batch number that matches your vial, and treat a supplier who cannot produce one as an unknown quantity.
If you are going to use it
MT2 arrives lyophilised, as a dry powder, and needs reconstituting with bacteriostatic water before use. Once mixed it must be refrigerated and it has a limited life. Dry powder is far more forgiving, so leave it unmixed until you need it. We went through the specifics in how to store peptides long term, and the injection basics carry over from how to pin.
Two practical notes people learn the hard way. Nausea is much worse on an empty stomach, and it is much worse at the start, which is why most protocols begin low. And because it darkens everything systemically, you cannot tan one area, so plan around that before a wedding rather than after.
Questions worth answering properly
Is melanotan legal in Canada?
It is not an authorised drug, so it cannot be legally sold or marketed for human use here. It is sold as a research compound. Melanotan I under the name Scenesse is a licensed medicine but only for a rare photosensitivity disorder, and it is not available as a tanning product.
Melanotan 1 or 2, which should I use?
Melanotan I is not realistically available to you. It is a prescription drug for erythropoietic protoporphyria, administered as an implant by a specialist. Every product marketed for tanning is Melanotan II.
Do I still need UV exposure?
Yes. MT2 amplifies the response rather than replacing the trigger. Less UV for the same result, not zero.
How long until anything happens?
Pigment changes are usually visible within one to two weeks with regular exposure. Nausea and flushing show up on day one.
Does the tan stay after I stop?
It fades over a few weeks as pigmented cells turn over, faster without UV exposure. Moles and freckles that darkened may not go back.
Is it the same thing as a tanning injection from a salon?
Unlicensed tanning injections are MT2. Same compound, same lack of approval, usually with less information about the source.
Does it help with anything besides tanning?
The sexual arousal effect is real enough that a refined version of the same molecule became an approved drug for it. That does not make MT2 a treatment for anything. If that is the effect you want, our sexual aid rundown covers products intended for it.
The honest summary
Melanotan II works. It pigments people quickly and the effect is not subtle, which is why it has stayed popular for two decades without ever being approved. It also changes every mole on your body, which is a genuine problem rather than a disclaimer, and the mitigation is photographs and a yearly skin check rather than hoping.
If that trade is one you want to make with your eyes open, ours is MT2 10mg at $40, with a second option in the peptides section.
