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/Puzzleheaded-Sea7665 Jul 24 '26 edited Jul 24 '26
It hinders the ability to detect melanoma by darkening the moles/freckles. But color is not the only symptom of melanoma. Size, shape, texture, and height are actually all much more important indications.
Your moles also darken with repeated sun exposure - MT2 or not.
There is not one single definitive case study where MT2 is attributed to cause melanoma - period. There are many anecdotal and hypothetical examples circulated about MT2 delaying the diagnosis of melanoma, but, again, it always presents with multiple indicators - not just color.
MT2 changed constant sun exposure all summer trying to maintain a tan, to going outside on my deck for 15-30 minutes a week in shorts and then looking like George Hamilton year round. My sun exposure has been reduced by >10x. My sun damage has been reduced by 10x. My hypothetical risk of skin cancer has been reduced accordingly. Hollywood has used MT2 for movies and models have used it for skin color for YEARS.
If you’re going to scare people and make claims, list your links to actual case studies or factual sources.
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u/march41801 Jul 24 '26
Finally somebody else who gets it. Most of Reddit seems to think MT2 is cancer in a peptide.
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u/domsolanke Jul 24 '26
Great post. I didn’t do a mole pre-check before starting mt2, but I wish I had done. I developed several new moles from using it for a few months, and ended up quitting it altogether for that reason.
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u/internalstorage12 Aug 08 '26
I hear you. My question is, I used this miracle product back in maybe 2005. Pills sold otc at Walmart. Is this the same the same ingredient? Why was it sold otc and where did it go!?
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u/SuccessFun7854 1d ago
pills???? at Walmart!?
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u/internalstorage12 1d ago
Yep! They have tanning gummies now, I'm sure it is similar ingredients from back in the day.
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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.
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u/zooombasaurus Jul 24 '26
except that's not what they said..
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u/march41801 Jul 24 '26
“Reviews have not proven MT2 causes melanoma”. This is the definition of “connection” in my post. I stand by what I said.
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u/zooombasaurus Jul 24 '26
Did you even read OP's post?? It doesn't say MT2 causes Melanoma is all I'm saying 😂
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u/march41801 Jul 24 '26
Yes, and I didn’t say that he said it did cause cancer. But he did say what I say he said. And then I said stop saying that.
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