Side-by-Side Comparison · 2026

AHK-Cu vs Palmitoyl Pentapeptide-4

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

AHK-Cu
Skin & Cosmetic

AHK-Cu is a copper-chelating tripeptide (Ala-His-Lys) that functions as a hair follicle stimulant and skin regeneration signal. Related to the more widely studied GHK-Cu, AHK-Cu has shown specific activity in promoting hair follicle stem cell proliferation and inhibiting DHT-rela...

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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 AHK-Cu Palmitoyl Pentapeptide-4
Category Skin & Cosmetic Skin & Cosmetic
Research Research Use Widely Used (Cosmetic)
Half-Life - -
Typical Dose 2–5% solution 3–5% in formulation
Frequency Once or twice daily Once or twice daily
Route Topical Topical
FDA Status Not Approved (Cosmetic) Not Approved (Cosmetic Ingredient)

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Frequently Asked Questions
What is the difference between AHK-Cu and Palmitoyl Pentapeptide-4?
AHK-Cu: AHK-Cu is a copper-chelating tripeptide (Ala-His-Lys) that functions as a hair follicle stimulant and skin regeneration signal. Related to the more widely studied GHK-Cu, AHK-Cu has shown specific act... 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, AHK-Cu or Palmitoyl Pentapeptide-4?
AHK-Cu half-life: unknown. Palmitoyl Pentapeptide-4 half-life: unknown.
Can you stack AHK-Cu and Palmitoyl Pentapeptide-4?
AHK-Cu 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.