PT-141 vs Melanotan-2

PT-141 and Melanotan-2 are both melanocortin agonists, and PT-141 is actually a metabolite of Melanotan-2. The key difference is selectivity: PT-141 is focused on the libido pathway, while Melanotan-2 also drives pigmentation.

	PT-141 (Bremelanotide)	Melanotan-2
Compound class	Melanocortin agonist	Melanocortin agonist
Primary target	MC4R (central)	MC1R + MC4R
Category	Hormonal Optimization	Hormonal Optimization
Administration	Subcutaneous, as-needed	Subcutaneous, daily loading
Research focus	Central sexual-arousal pathways	Pigmentation (tanning) plus libido effects

Key differences

Receptor selectivity: PT-141 (Bremelanotide) acts mainly via MC4R on central arousal; Melanotan-2 activates MC1R and MC4R, adding pigmentation.
Primary research focus: PT-141 for sexual-arousal pathways; Melanotan-2 for tanning/pigmentation plus libido.
Side profile: Melanotan-2's MC1R activity drives tanning and can cause more nausea and freckling; PT-141 avoids the pigmentation arm.
Dosing: PT-141 is typically used as-needed; Melanotan-2 uses a daily loading phase for pigmentation research.

Which is right for your research?

PT-141 is the libido-selective melanocortin agonist; Melanotan-2 is the broader one that also drives tanning. PT-141 is essentially the arousal-focused refinement.

Frequently asked questions

What is the difference between PT-141 and Melanotan-2?

PT-141 (Bremelanotide) is a melanocortin agonist focused on the libido pathway via MC4R, while Melanotan-2 also activates MC1R, adding pigmentation/tanning effects.

Is PT-141 related to Melanotan-2?

Yes. PT-141 is a metabolite of Melanotan-2, refined toward the central arousal pathway without the strong pigmentation arm.

Which one causes tanning?

Melanotan-2 drives pigmentation through MC1R activity; PT-141 does not target that pathway meaningfully.

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