Copper peptides,
studied for the scalp.

Copper is a trace mineral the body already uses in the enzymes that build and remodel the tissue around the hair follicle — including lysyl oxidase, which cross-links the collagen and elastin scaffolding that anchors each follicle in the scalp. Without adequate copper available locally, that scaffolding is harder to maintain.

Peptides are short chains of amino acids. On their own, small peptides like GHK and AHK are recognised by the skin as signalling molecules. Bound to a copper ion, they become a stable delivery vehicle — the peptide carries the copper to where it is needed and releases it into the cellular environment around the follicle.

That combination — a targeted signalling peptide plus bioavailable copper — is why copper-peptide complexes have been studied for over four decades in wound healing, skin remodelling and, more recently, hair biology.

What GHK-Cu has been studied for around the follicle:

• Dermal papilla signalling. In vitro work suggests GHK-Cu supports the proliferation of dermal papilla cells, which govern the hair growth phase (anagen).
• Extracellular matrix remodelling. Studied for its role in supporting collagen and glycosaminoglycan turnover in the tissue that surrounds and supports each follicle.
• 5-alpha-reductase modulation. Early lab research has looked at GHK-Cu's interaction with the enzyme most associated with androgen-driven follicle miniaturisation.
• Antioxidant behaviour. The complex has been shown in cell studies to help quench reactive oxygen species — the same oxidative stress created by UV, pollution and heat styling.

SXE does not make medical claims. Individual results vary and copper peptides are not a replacement for prescription hair-loss treatment.

Why we pair it with GHK-Cu:

• Smaller molecular size. AHK-Cu is more compact than GHK-Cu, which is thought to improve penetration through the outer layer of the scalp.
• Complementary signalling. Formulation research suggests AHK-Cu targets the appearance of hair fibre diameter and density, while GHK-Cu is more associated with the surrounding follicular environment.
• Better together. Stacking the two lets the formula stay effective at concentrations that are gentle enough for daily use, rather than pushing a single peptide to an irritating dose.

Copper peptides are fragile. They are sensitive to pH, to reducing agents (like vitamin C in the same formula), and to strong preservatives. Formulating with them is as much about what you leave out as what you put in.

Copper peptides at cosmetic concentrations have a long clinical safety record in topical use. The SXE formulas are non-irritating to the scalp barrier, safe on colour-treated and chemically straightened hair, and suitable for daily use by adults.

• Pregnancy & breastfeeding: we recommend checking with your GP before starting any topical peptide product.
• Vitamin C serums: do not layer a high-strength L-ascorbic acid product on the scalp at the same time — it can destabilise the copper complex. Alternate mornings and nights.
• Sensitive scalps: introduce nightly for the first week, then move to your preferred cadence.