PT-141 vs Melanotan II at a glance
| PT-141 | Melanotan II | |
|---|---|---|
| Also known as | Bremelanotide | MT-II |
| Category | Sexual Health & Tanning | Sexual Health & Tanning |
| Format | SubQ | SubQ |
| Research level | Beginner | Intermediate |
| Research sizes | 5 mg vial, 10 mg vial | 10 mg vial |
| In one line | A melanocortin agonist studied for libido and sexual-function research. | A melanocortin agonist studied for pigmentation and melanocortin-pathway research. |
What is PT-141?
PT-141 (Bremelanotide) is a synthetic melanocortin-receptor agonist derived from Melanotan II. It is studied for sexual-function endpoints through a central-nervous-system mechanism rather than a vascular one.
PT-141 research focuses on activation of melanocortin receptors (notably MC4R) in the central nervous system, which is the distinguishing feature versus vascular mechanisms studied for other compounds.
What is Melanotan II?
Melanotan II is a synthetic analog of alpha-melanocyte-stimulating hormone, a non-selective melanocortin agonist. It is studied for melanogenesis (pigmentation) and broader melanocortin endpoints in research models.
Melanotan II activates multiple melanocortin receptors, driving melanin production in research models and engaging MC4R pathways relevant to appetite and libido endpoints.
Key research differences
The two are best understood by what each is studied for. PT-141: Unlike vascular-pathway compounds, PT-141 acts centrally; unlike Melanotan I/II it is studied primarily for sexual-function rather than tanning endpoints. Melanotan II: Melanotan II is a non-selective agonist studied for pigmentation and broad melanocortin endpoints; Melanotan I (afamelanotide) is more selective; PT-141 is studied for sexual function.
How researchers choose between them
Because PT-141 and Melanotan II both sit in the sexual health & tanning category, the choice is a research-design question: match the compound to the exact signal or endpoint your model targets, and in many protocols the two are studied in parallel or in sequence rather than as either/or. Whichever you select, compare on verified quality: both are third-party tested to a 99%+ purity target with a COA on request.
Frequently asked questions
What is the difference between PT-141 and Melanotan II?
PT-141 is a melanocortin agonist studied for libido and sexual-function research, while Melanotan II is a melanocortin agonist studied for pigmentation and melanocortin-pathway research. Both sit in the sexual health & tanning research category. Both are research-use-only. PT-141: Unlike vascular-pathway compounds, PT-141 acts centrally; unlike Melanotan I/II it is studied primarily for sexual-function rather than tanning endpoints.
Can PT-141 and Melanotan II be studied together?
Yes - within the same category they are often studied in parallel or sequence to compare or combine effects. Any combination work is laboratory research only. Melanotan II: Melanotan II is a non-selective agonist studied for pigmentation and broad melanocortin endpoints; Melanotan I (afamelanotide) is more selective; PT-141 is studied for sexual function.
Which is better, PT-141 or Melanotan II?
Neither is universally "better" - the right choice depends on the research question. Match the compound to your model's target signal, and compare suppliers on verifiable third-party purity, not sticker price. PT-141 (Bremelanotide) is a synthetic melanocortin-receptor agonist derived from Melanotan II.
What sizes are PT-141 and Melanotan II supplied in?
PT-141 is supplied in 5 mg and 10 mg research sizes and Melanotan II in 10 mg, both as lyophilized (freeze-dried) powder in sealed vials that are reconstituted in the lab before use in a liquid research model. A Certificate of Analysis tied to the tracked lot is available on request for either compound.
Are PT-141 and Melanotan II FDA approved?
No. The research-grade PT-141 and Melanotan II supplied here are not FDA-approved drug products; they are sold strictly for laboratory and in-vitro research. Where an approved pharmaceutical form of either compound exists, it is a separate prescription product made to clinical standards. Research material is not for human or animal consumption.
All comparisons · PT-141 · Melanotan II · PT-141 cost
External references: Peptide (Wikipedia) · U.S. Food and Drug Administration