Side-by-Side Comparison · 2026

Melanotan II vs Palmitoyl Pentapeptide-4

Melanotan II vs Palmitoyl Pentapeptide-4 — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Melanotan II
Skin & Cosmetic

Melanotan II (MT-II) is a synthetic analog of alpha-MSH (alpha-melanocyte-stimulating hormone) that non-selectively activates melanocortin receptors MC1R through MC5R. It produces accelerated skin tanning via MC1R stimulation of melanogenesis, increases libido through MC3R and MC...

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Palmitoyl Pentapeptide-4
Skin & Cosmetic

Palmitoyl Pentapeptide-4 (Pal-KTTKS, also marketed as Matrixyl) is a cosmetic peptide derived from a fragment of procollagen type I. The palmitoyl fatty acid attachment allows it to penetrate the skin lipid barrier and reach dermal fibroblasts....

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Key Parameters
Parameter Melanotan II Palmitoyl Pentapeptide-4
Category Skin & Cosmetic Skin & Cosmetic
Research Research Use Widely Used (Cosmetic)
Half-Life ~1.5 hours -
Typical Dose 250–500 µg (starting); up to 1,000 µg 3–5% in formulation
Frequency Daily initially; 2–3x/week maintenance Once or twice daily
Route Subcutaneous Topical
FDA Status Not Approved Not Approved (Cosmetic Ingredient)

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Frequently Asked Questions
What is the difference between Melanotan II and Palmitoyl Pentapeptide-4?
Melanotan II: Melanotan II (MT-II) is a synthetic analog of alpha-MSH (alpha-melanocyte-stimulating hormone) that non-selectively activates melanocortin receptors MC1R through MC5R. It produces accelerated skin tan... Palmitoyl Pentapeptide-4: Palmitoyl Pentapeptide-4 (Pal-KTTKS, also marketed as Matrixyl) is a cosmetic peptide derived from a fragment of procollagen type I. The palmitoyl fatty acid attachment allows it to penetrate the skin...
Which has a longer half-life, Melanotan II or Palmitoyl Pentapeptide-4?
Melanotan II half-life: ~1.5 hours. Palmitoyl Pentapeptide-4 half-life: unknown.
Can you stack Melanotan II and Palmitoyl Pentapeptide-4?
Melanotan II and Palmitoyl Pentapeptide-4 are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.