GHK-Cu / AHK-Cu Growth Serum

GHK-Cu / AHK-Cu Growth Serum from Ion Peptide, built on GHK-Cu (inj/oral). Below: what's in it, whether the active actually reaches the layer it needs to, where it goes in a routine, and what to expect.

Does GHK-Cu (inj/oral) actually work on skin?

This is a different question from whether it works injected, and the answer is often different too — a molecule has to survive the stratum corneum before any of its biology matters. Full GHK-Cu (inj/oral) breakdown →

Human clinical evidence

• The best-evidenced peptide in this section for topical use, and unusually it is evidenced as a topical specifically rather than borrowed from injection studies. Controlled work reports increased collagen and elastin, improved skin firmness and reduced fine lines over 12 weeks in facial creams, and improved wound closure in dermatology settings.

Correlative data

• Decades of use in cosmetic dermatology, and one of very few peptides that survived from prescription wound care into ordinary skincare on the strength of results rather than marketing.
• Scalp use for density is widespread and reported experience is positive but slow — months, not weeks — and far less dramatic than minoxidil.

How the mechanism reads

• A copper-binding tripeptide (glycyl-L-histidyl-L-lysine) at about 340 Da — small enough to actually cross the stratum corneum, which is why it works topically when larger peptides do not. It upregulates collagen I, III and IV and elastin, signals metalloproteinase remodelling, and delivers copper as a cofactor for lysyl oxidase, the enzyme that cross-links collagen.
• The copper is the caveat. It is what makes it work and also what makes it stain, oxidise and interact badly with direct vitamin C in the same layer. Separate them by routine, AM and PM.

Does AHK-Cu actually work on skin?

This is a different question from whether it works injected, and the answer is often different too — a molecule has to survive the stratum corneum before any of its biology matters. Full AHK-Cu breakdown →

Human clinical evidence

• Much less studied than GHK-Cu. Most claims are extrapolated from its copper-peptide cousin rather than tested directly.
• The trial that would settle it has never been run: a split-scalp comparison against minoxidil, or against GHK-Cu alone, over a full hair cycle. Until someone does, AHK-Cu is a mechanistically reasonable addition to a routine and not a replacement for the one drug in this space with real data.

Correlative data

• Used in scalp and hair-density products, often alongside GHK-Cu. Reported experience is slow and modest.

How the mechanism reads

• Copper tripeptide-3 (Ala-His-Lys-Cu). Same copper-delivery premise as GHK-Cu but oriented toward the follicle — proposed to support dermal papilla cells and follicular microvascularisation.
• Small enough to penetrate, like GHK-Cu. The gap is evidence, not plausibility.
• The interesting difference from GHK-Cu is vascular rather than structural. AHK (alanyl-histidyl-lysine) is proposed to act on the follicle through VEGF and dermal papilla signalling — the blood-supply side of hair growth — where GHK-Cu's argument is collagen and matrix remodelling. That is why the two are usually run together rather than chosen between: they are aimed at different halves of the same problem.

How to use GHK-Cu / AHK-Cu Growth Serum

Step 8 — Hair & scalp

Scalp, on clean dry or damp scalp. Both copper peptides in one — GHK-Cu for skin and AHK-Cu for follicle. Keep it out of the same layer as direct vitamin C — copper and ascorbic acid deactivate each other. Vitamin C in the morning, copper peptides at night, and both keep working. Same copper rule as GHK-Cu: not in the same layer as direct vitamin C. The two copper peptides are fine together — they are aimed at different halves of the follicle.

What to expect, and when

Hair is slow. 4–6 months, photograph the start.

What not to layer with GHK-Cu / AHK-Cu Growth Serum

• GHK-Cu (inj/oral) + Vitamin C — Copper peptides and direct (L-ascorbic) vitamin C deactivate each other. Not dangerous — just wasteful. Split them: vitamin C in the morning, copper peptide at night.

Where to get GHK-Cu / AHK-Cu Growth Serum

Other GHK-Cu (inj/oral) products in the Vault

Other AHK-Cu products in the Vault

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