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preclinicalSkin & Cosmetic

Copper Peptide AHK

Also known as: AHK-Cu, Ala-His-Lys Copper Complex, Alanine-Histidine-Lysine Copper, Tripeptide-3 Copper

Copper Peptide AHK (Ala-His-Lys:Cu) is a tripeptide-copper complex structurally related to GHK-Cu that has demonstrated significant hair growth stimulation in preclinical studies. AHK-Cu promotes dermal papilla cell proliferation and upregulates vascular endothelial growth factor (VEGF), making it a promising candidate for androgenetic alopecia treatment. It is increasingly featured in topical hair and scalp formulations alongside GHK-Cu.

2 cited references·5 researched benefits

Quick Answer

Copper Peptide AHK is a tripeptide-copper complex (Ala-His-Lys:Cu) researched for hair growth and scalp health. In preclinical studies, it stimulates dermal papilla cell proliferation and increases VEGF expression to promote hair follicle vascularization. AHK-Cu has shown comparable or superior hair growth activity to GHK-Cu in cell culture models and is used in topical cosmeceutical formulations for thinning hair, though clinical trials in humans have not yet been completed.

Key Facts

Mechanism
AHK-Cu binds copper(II) ions through its histidine and lysine residues, delivering bioavailable copper to dermal papilla cells in hair follicles. It activates the Wnt/β-catenin signaling pathway, which is critical for hair follicle cycling and anagen (growth phase) induction. AHK-Cu upregulates VEGF to enhance blood flow to hair follicles, stimulates dermal papilla cell proliferation via ERK signaling, and promotes extracellular matrix production. It also exhibits anti-inflammatory properties that may help reduce follicular miniaturization associated with androgenetic alopecia.
Research Status
preclinical
Half-Life
~8-12 hours (topical persistence, estimated)
Molecular Formula
C₁₂H₂₁CuN₅O₄
Primary Use
Skin & Cosmetic
Table of Contents

Benefits

  • Stimulates dermal papilla cell proliferation for hair follicle activationmoderate
  • Upregulates VEGF expression to improve hair follicle blood supplymoderate
  • May slow or reverse follicular miniaturization in androgenetic alopeciapreliminary
  • Anti-inflammatory properties that support scalp healthpreliminary
  • Promotes extracellular matrix synthesis for improved skin texturepreliminary

Dosage Protocols

RouteDosage RangeFrequencyNotes
Topical (serum/solution)1–5 ppm copper peptide concentrationDaily application to scalpApplied to clean, dry scalp. Often combined with GHK-Cu in multi-peptide hair growth formulations.
Topical (microneedling adjunct)1–5 ppm solutionEvery 1–2 weeks post-microneedlingEnhanced penetration when used after derma-roller (0.25-0.5 mm) or microneedling on the scalp.

Medical disclaimer

Dosage information is provided for educational reference only. Always follow your prescriber's instructions and consult a qualified healthcare provider before starting any peptide protocol.

Side Effects

  • Mild scalp irritation or redness at application sitecommon
  • Contact dermatitis in copper-sensitive individualsrare
  • Temporary hair shedding during initial use (growth phase synchronization)rare

Frequently Asked Questions

What is the difference between AHK-Cu and GHK-Cu?
Both are tripeptide-copper complexes used in skin and hair care, but they have different amino acid sequences. GHK-Cu (Gly-His-Lys:Cu) is more extensively studied with broader applications in wound healing, anti-aging, and hair growth. AHK-Cu (Ala-His-Lys:Cu) has shown particularly strong activity in stimulating dermal papilla cells and may be more specialized for hair growth applications. Some in vitro studies suggest AHK-Cu has comparable or greater hair growth stimulating activity than GHK-Cu, though it lacks the same depth of clinical evidence.
Can AHK-Cu regrow hair lost to male pattern baldness?
Preclinical studies show that AHK-Cu stimulates dermal papilla cell proliferation and VEGF expression, which are important for maintaining active hair follicles. However, once follicles are completely miniaturized and the hair bulb is lost, no topical peptide has been proven to regenerate the follicle. AHK-Cu is most likely to benefit those with early-stage thinning where follicles are still present but producing thinner, shorter hairs. No human clinical trials have yet confirmed efficacy for hair regrowth.
How long does it take to see results with AHK-Cu for hair?
Based on preclinical data and anecdotal reports from users of copper peptide hair products, expect a minimum of 3-6 months of consistent daily use before visible hair improvements. Hair follicle cycling is slow — a single growth phase lasts 2-6 years. Initial shedding in the first 2-4 weeks is possible as follicles synchronize into a new growth cycle, which is generally considered a positive sign.

References

  1. 1
    Copper peptide GHK-Cu and AHK-Cu stimulation of dermal papilla cells in vitro and effects on hair growth(2007)PubMed ↗
  2. 2
    The role of copper peptides in hair follicle biology and potential therapeutic applications(2015)PubMed ↗

Latest Research

Last updated: 2026-02-19