# GHK-Cu + AHK-Cu Hair Serum

> Leave-on scalp serum with two copper peptides, 60 mL dropper bottle

All products are sold strictly for laboratory research use only. Not for human or veterinary use.

- Web page: https://peptidemedixeu.com/en/products/ghk-cu-ahk-cu-hair-serum/
- Brand: Peptide Medix EU
- Category: [Hair Research Peptides](https://peptidemedixeu.com/en/collections/hair-peptides/)
- from €97 (EUR)

## Sizes and prices (EUR)

| Size | Price | SKU |
| --- | --- | --- |
| 60 mL | €97 | GHK-CU-AHK-CU-HAIR-SERUM-60-ML |

_Catalog prices at build time; the web page and checkout are authoritative._

## Specifications

- **Form:** Blue-tinted aqueous leave-on serum in a dropper bottle
- **Available size:** 60 mL
- **Active 1:** GHK-Cu — copper(II) complex of glycyl-L-histidyl-L-lysine (INCI copper tripeptide-1)
- **Active 1 identifiers:** CAS 89030-95-5 · C14H24N6O4·Cu · 403.93 g/mol
- **Active 2:** AHK-Cu — copper(II) complex of alanyl-L-histidyl-L-lysine (INCI copper tripeptide-3)
- **Active 2 identifiers:** CAS 1245800-58-7 · C15H26N6O4·Cu · ≈417.96 g/mol as the copper complex
- **Peptide purity inputs:** ≥99% by HPLC for both actives; lot-matched COAs available
- **Concentrations:** Printed on the lot label; comparable research serums typically run each copper tripeptide near 1%
- **Vehicle:** Lightweight aqueous leave-on base, low residue, no added fragrance or colourant
- **Colour:** Blue to blue-violet — colour intensity tracks intact copper coordination
- **Research areas:** Dermal papilla cell signalling, follicle-cycle models, angiogenic marker expression, combination formulation studies
- **Storage:** 2–8 °C preferred, protected from light; keep the dropper closure tight
- **Compatibility note:** Reducing agents and strong chelators dissociate copper from both tripeptides

## Description

This leave-on scalp serum combines the two copper-chelating tripeptides that dominate follicle research — GHK-Cu and AHK-Cu — in one preparation, filled into a 60 mL dropper bottle. GHK-Cu is glycyl-L-histidyl-L-lysine complexed with copper(II) (CAS 89030-95-5, C14H24N6O4·Cu, 403.93 g/mol), listed in INCI terms as copper tripeptide-1. AHK-Cu swaps the glycine for alanine and is listed as copper tripeptide-3.

Both peptides hold copper because their His-Lys motif creates a square-planar binding site with high affinity for Cu(II) — which is also why they look blue, whether as powder or in solution. That colour gives the easiest visual check of an intact complex: once a serum has turned colourless, its copper is no longer coordinated, regardless of the peptide content on the label.

## Frequently asked questions

### What does the serum contain?

A leave-on aqueous base with two copper-binding tripeptides: GHK-Cu (glycyl-L-histidyl-L-lysine bound to copper(II)) and AHK-Cu, its alanine counterpart. Both inputs are ≥99% pure by HPLC, and the lot label states the concentration of each.

### What separates GHK-Cu from AHK-Cu?

Just one amino acid: GHK starts with glycine, AHK with alanine. They share the His-Lys motif that builds the square-planar copper site. Being so alike, they are often studied together — which makes matched single-active controls essential in combination experiments.

### Where does the blue colour come from?

From copper(II) held by the tripeptides; the stronger the blue, the more complex remains intact. A preparation that fades towards colourless or drifts to green-brown has had its coordination disrupted and no longer contains the same active.

### Which purity documents can I get?

Both peptide inputs are tested by reversed-phase HPLC to ≥99%, and their lot certificates are available on request. The label of each finished serum lot records the concentration of both actives in that batch.

### What should it not be combined with?

Reducing agents like ascorbic acid, thiols, strong chelators such as EDTA and strongly acidic media all interfere with copper binding. For cell experiments, bear in mind that copper in the culture medium matters too, because free copper ions act very differently from the bound complex.

### How is the serum stored?

Ideally in the fridge at 2–8 °C, upright, tightly capped and away from direct light. Use the dropper to transfer serum into a clean vessel and never pour leftovers back — once opened, water-based leave-on products are prone to contamination.

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All products offered on this website are intended solely for in-vitro laboratory research and development by qualified professionals. They are not drugs, foods, cosmetics or dietary supplements, and are not intended to diagnose, treat, cure or prevent any disease. Products must not be introduced into humans or animals in any manner. By purchasing, you confirm that you are a qualified researcher and accept full responsibility for handling and storage in accordance with applicable laws.

Peptide Medix EU · https://peptidemedixeu.com/en/products/ghk-cu-ahk-cu-hair-serum/