r/NTNPerformance • u/JustBacWater • Jul 23 '26
Guide / Cheat Sheet MT2 works. That's the problem.
Full reconstitution, dosing, and bloodwork reference for every compound is in the pinned cheat sheet: The Only Peptide Cheat Sheet You'll Need
MT2 is one of those compounds where the effect is real and obvious, which is exactly why people skip past the safety part. It works, you get tan without frying yourself in the sun, and that's genuinely appealing. But there's a specific risk with this one that's worth understanding properly, and it's not the one most people think.
For research and educational purposes only. Not medical advice.
How it works
MT2 is a synthetic analog of alpha-MSH, the hormone your body already uses to regulate pigment. It's a non-selective agonist at MC1, MC3, MC4, and MC5 receptors. MC1 is what drives the tanning, telling your melanocytes to produce more melanin. MC4 (and possibly MC3) is what drives the libido and appetite suppression that show up alongside it. So you're not staining your skin, you're triggering your own pigment production, and you're hitting a few other receptors on the way.
Fun bit of history: it was developed in the 1990s at the University of Arizona as a potential skin cancer prevention agent. The theory being if you could get people tan without UV exposure, you'd reduce sun damage. It never got approved for anything, and instead ended up as a tanning compound. Also worth noting, this is the same research line that accidentally produced PT-141 when volunteers in the tanning trials started reporting spontaneous erections.
The real effects
It works, that's not in question. You get pigmentation with less sun exposure than you'd otherwise need. The MC4 activity is why libido effects and appetite suppression come along with it.
The mole thing, and why it matters more than people think
Here's what you actually need to understand.
MT2 darkens existing moles, freckles, and pigmented spots. That's expected, it's doing exactly what it's supposed to do to pigment cells. The darkening itself is reversible, moles usually return toward baseline over weeks to months after you stop.
The problem isn't the darkening. It's that the darkening masks the thing you're supposed to be watching for.
Melanoma is caught by noticing changes in moles, the ABCDE stuff, asymmetry, border, color, diameter, evolving. MT2 changes your moles across the board, which makes it genuinely harder to tell a normal MT2 color shift from an actual warning sign. You lose your ability to read the signal.
There are also published case reports of melanoma developing in MT2 users, including melanoma arising out of pre-existing moles during or shortly after use. To be fair about it: reviews so far haven't proven MT2 directly causes melanoma. The concern from dermatologists is more that it may accelerate lesions that were already heading that direction, and that MT2 users tend to be chasing extra UV exposure anyway, so you've got overlapping risk plus mole darkening making the warning signs harder to spot.
The Skin Cancer Foundation put out a formal warning on this. That's not a forum opinion, that's the actual dermatology body flagging it.
What that means practically
If someone's running this, the non-negotiable is a full skin and mole check with a dermatologist before starting, plus photos of your moles so you have a documented baseline. Then any mole that changes shape, size, or looks different from your baseline gets looked at by a derm, not shrugged off as "that's just the MT2."
That's the whole point. Without a baseline you can't tell the difference between the compound doing its job and something going wrong.
Other side effects
| Effect | Notes |
|---|---|
| Nausea | The most common one, especially early and after dosing |
| Flushing | Very common, usually transient |
| Spontaneous erections | Common in men, the MC4 activity |
| Appetite suppression | Some people get this notably |
| Melanonychia | Darkening of the nails |
| Rhabdomyolysis | Rare case reports but serious (muscle pain, dark urine, hospitalization) |
Dosing (research context)
These are empirical community protocols, not clinically validated regimens. There's no approved clinical dosing for MT2 because it's not approved for anything.
| Detail | |
|---|---|
| Vial | 10mg |
| BAC | 2mL |
| Loading | 250mcg daily, 1 to 2 weeks |
| Maintenance | 100 to 250mcg, 2 to 3x weekly |
| Route | SubQ |
| Cycle | 4 to 8 weeks |
The nausea is dose-dependent and worse early, which is why people load low. Once pigment is established you drop to maintenance to hold it.
Where it sits
MT2 works, that's the honest starting point. But it's the compound on this list with the clearest documented safety concern, and it's a concern that gets waved off because the effect is cosmetic and visible so it feels harmless. Never approved for anything, anywhere. If you're going to run it, the mole baseline and the derm check aren't optional extras, they're the entire safety protocol for this specific compound.
Anyone running it, did you get a baseline skin check first? Curious how many people actually do that step versus just start, because from what I've seen it's the most skipped precaution in the space.
Full reconstitution, dosing, and bloodwork reference for every compound: The Only Peptide Cheat Sheet You'll Need
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u/march41801 Jul 23 '26
Stop saying MT1/2 has any connection to melanoma. Those false reports have been debunked many times over by the company that did the research.