LearnPT-141 vs MT-2 (Melanotan 2): Key Differences
Research overview
PT-141 vs MT-2 (Melanotan 2): Key Differences
Bremelanotide vs Melanotan 2 Acetate
Nearly the same cyclic peptide, one small change at the end. Why PT-141 sits in Desire and MT-2 in Skin.
Heads up: this is product info for lab and research use only. It isn't medical advice, and it doesn't diagnose, treat, cure, or prevent any disease.
Almost the same molecule
PT-141 (bremelanotide) and MT-2 (Melanotan 2) are close relatives. Both are small cyclic peptides built on the same seven-amino-acid ring, and both come from the same family as alpha-MSH, the body's own melanocortin hormone. The structural difference is one tiny change at the end of the chain: MT-2 ends in an amide, PT-141 in a free acid. That's about one dalton of mass, small enough that labs check it carefully when they confirm identity.
We list PT-141 10mg in Desire and MT-2 10mg with the Skin listings.
Why they ended up in different places
That small change shifts which melanocortin receptors each one prefers. Research describes MT-2 as broad: it acts across several receptors, including MC1R, the one tied to skin pigment. That's why MT-2 is mostly talked about in tanning and pigmentation research.
PT-141 leans much more toward MC4R, a receptor in the brain studied around sexual desire, with far less pull on MC1R. It was developed out of the MT-2 work, and bremelanotide went on to be approved as a prescription drug for a specific condition in 2019. MT-2 has never been approved for anything.
That's the research background, listed as product information. It isn't a claim about what either vial does in a person.
Side by side
- MT-2: Melanotan 2 Acetate, broad melanocortin activity, pigmentation research angle, 10mg vial.
- PT-141: bremelanotide, MC4R-leaning, desire research angle, 10mg vial.
- MT-1, for context: Melanotan I (afamelanotide) is a linear peptide, not cyclic, and sits next to MT-2 in Skin. See MT-1 vs MT-2.
Keep reading
Each compound has its own page: What is PT-141? and What is MT-2?. KPV comes from the same parent hormone but from the opposite end, and it doesn't act on these receptors at all. More on that in KPV vs BPC-157.
Quick answers
Are PT-141 and Melanotan 2 the same?
Nearly, but not quite. They share the same cyclic core. MT-2 ends in an amide and PT-141 in a free acid, and that small change shifts which melanocortin receptors each one prefers.
Why is MT-2 in Skin and PT-141 in Desire?
Research describes MT-2 as acting broadly, including on MC1R, the receptor tied to skin pigment. PT-141 leans toward MC4R, which is studied around desire. We group them by those research angles.
What sizes are they?
Both are 10mg lyophilized research vials.
Related listings
Nearby catalog cards for what this page covers.
This is product information, not medical advice, and not a prescription. Nothing here diagnoses, treats, cures, or prevents disease. Talk with a licensed clinician before using any peptide or booster.