Side-by-Side Comparison

PT-141 (Bremelanotide) vs Melanotan-II

Dosing, half-life, mechanism, benefits, and safety — side by side.

PT-141 (Bremelanotide)

FDA Approved

Melanocortin receptor agonist FDA-approved for sexual dysfunction

Half-Life

Variable

Route

Dose

1.75 mg PRN

1025.18 Da

Full PT-141 (Bremelanotide) research guide →

Melanotan-II

FDA Approved

Melanocortin receptor agonist for tanning and appetite suppression

Half-Life

~1 hour

Route

Dose

0.5-1 mg Loading then maintenance

1024.0 Da

Full Melanotan-II research guide →

Quick Reference

	PT-141 (Bremelanotide)	Melanotan-II
Category	N/A	N/A
Route	SC	SC
Typical Dose	1.75 mg PRN	0.5-1 mg Loading then maintenance
Frequency	N/A	N/A
FDA Approved	Yes	Yes
WADA Status	Not banned	Not banned

⏱ Pharmacokinetics

	PT-141 (Bremelanotide)	Melanotan-II
Half-Life	Variable	~1 hour
Research Status	N/A	N/A
CAS Number	189691-06-3	121062-08-6

Molecular

	PT-141 (Bremelanotide)	Melanotan-II
Molecular Weight	1025.18	1024.0
Molecular Formula	C50H68N14O10	C50H69N15O9
Sequence Length	42 aa	125 aa
Mechanism	Melanocortin receptor agonist	Melanocortin receptor agonist for tanning

Key Benefits

	PT-141 (Bremelanotide)	Melanotan-II
Benefits	FDA-approved libido enhancement; Sexual desire boost; Central nervous system activation; Effective in premenopausal women; Non-hormonal approach; Clinically proven efficacy; HSDD Treatment: Significant improvement in desire/distress scores; Significant improvement in sexual desire (FSFI scale)	Penile erection in 17/20 men without sexual stimulation; Increased sexual desire; Weight loss and fat reduction; Tanning/skin pigmentation; Tanning without UV exposure; Erectile function enhancement; Appetite suppression

Safety & Warnings

	PT-141 (Bremelanotide)	Melanotan-II
Safety Note	FDA-approved with established safety profile. Common side effects include nausea and flushing.	⚠️⚠️ ILLEGAL - NOT APPROVED in any jurisdiction. Multiple national health warnings issued. NO SAFE PROTOCOL. Associated with priapism and melanocytic changes.
Side Effects	Nausea (39.9%, common); Facial flushing (20.4%); Headache (11%); Blood pressure increase; Facial flushing; BP increase; Mild-Moderate side effect; Mild-Moderate side effect	Nausea (12.9% severe at 0.025 mg/kg); Facial flushing; Yawning; Priapism (case reports); Nausea; Facial flushing; Melanocytic changes; NOT APPROVED - health warnings
Athlete Warning	Not WADA banned - antioxidant supplement safe for competitive athletes	N/A

Which should you choose?

Both PT-141 (Bremelanotide) and Melanotan-II have meaningful research support. The right choice depends on your specific goals, tolerance, and whether an FDA-approved option fits your needs.

PT-141 (Bremelanotide) vs Melanotan-II — FAQ

Which has a longer half-life: PT-141 (Bremelanotide) or Melanotan-II?

PT-141 (Bremelanotide) has a half-life of ~Variable while Melanotan-II has a half-life of ~~1 hour. A longer half-life generally means less frequent dosing and more stable levels.

Can I stack PT-141 (Bremelanotide) and Melanotan-II together?

Whether PT-141 (Bremelanotide) and Melanotan-II can be stacked depends on their mechanisms and receptor targets. Use the stack compatibility checker to analyze synergies and conflicts before combining any peptides.

Which is better: PT-141 (Bremelanotide) or Melanotan-II?

There is no universal "better" peptide — it depends on your goal. PT-141 (Bremelanotide) is Melanocortin receptor agonist. Melanotan-II is Melanocortin receptor agonist for tanning. Choose based on your primary goal and research profile.

Compare any two peptides Check stack compatibility

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