What is the difference between AHK-Cu and GHK-Cu?

One amino acid. GHK-Cu is glycine, histidine and lysine bound to copper. AHK-Cu swaps the glycine for alanine. GHK-Cu occurs naturally in human plasma. AHK-Cu is synthetic. Both carry copper into skin and follicle tissue for collagen and elastin cross-linking, so the mechanisms are nearly the same. The evidence behind them is not.

Is AHK-Cu better than GHK-Cu for hair?

No, and this is the most common misconception about the pair. AHK-Cu is marketed as the hair peptide and it does hold the only hair-specific study, Pyo 2007, which elongated follicles ex vivo. But GHK-Cu still scores higher on hair and nails, 4.5 against 2.8, and neither has a human regrowth trial. Treat either as an adjunct to minoxidil, microneedling or red light therapy.

Which one should I use on my face?

GHK-Cu, at 0.5 to 3 percent, once or twice daily. Its skin-beauty subrating is 9.0 against AHK-Cu's 2.0, and that gap exists because AHK-Cu has no skin study of any kind. Every face claim made for AHK-Cu is borrowed from GHK-Cu practice. Older, photoaged or collagen-depleted skin is the clearest responder group. Separate it from strong acids and retinoids in the same application window to avoid pH and irritation conflicts.

How much evidence does AHK-Cu actually have?

One study. Pyo 2007 tested AHK-Cu in vitro and ex vivo, showing hair follicle elongation and dermal-papilla cell proliferation, with a non-significant apoptosis endpoint. It has never been replicated in almost two decades, and there is no human trial. Everything else you will read about copper peptides, including the injectable hair cocktails, is GHK-Cu evidence wearing the wrong label.

Can I use both at the same time?

You can, and blends exist, often sold as 10 percent GHK-Cu plus 5 percent AHK-Cu. There is no evidence of an additive effect, and the mechanisms are close to identical, so you are mostly paying twice for the same copper delivery job. Running both also means you cannot attribute any result to either one. If you use a blend, judge it as a GHK-Cu product.

GHK-Cu. Its topicals run about $30 to $100 a month. AHK-Cu serums come out at an ESTIMATE of roughly $74 to $115 a month, from one vendor's 4 percent hair serums at $148 to $229 per 60-day bottle. The better-evidenced peptide is the cheaper one, which is unusual and worth acting on.

Who should avoid both?

Anyone with Wilson disease, known copper overload or unexplained high copper markers, and anyone with copper or peptide contact hypersensitivity. Pregnancy and lactation rule out both, since neither has cosmetic safety data in those groups. GHK-Cu adds active malignancy and suspicious skin lesions, because it signals for repair and angiogenesis. AHK-Cu adds broken or actively inflamed skin. Skip injectable use of either. It is off-label, non-approved and unstudied.

How do I make sure I am buying the right one?

Read the INCI name. Copper Tripeptide-1 is GHK-Cu. Copper Tripeptide-3 is AHK-Cu. Vendors mislabel them routinely, and product pages often cite GHK-Cu research on an AHK-Cu bottle. If the label says Copper Tripeptide-1 and the marketing talks about AHK, the marketing is wrong. Buy on the INCI name and the stated percentage, not on the peptide the headline names.

Head-to-Head Comparison

AHK-Cu vs GHK-Cu: Which Is Better for Skin?

Should I use AHK-Cu or GHK-Cu?

Reviewed 09/08/2026

GHK-Cu wins this on evidence. It has human wound and skin data behind it. AHK-Cu has one unreplicated dish study and no human trial at all. Use GHK-Cu for skin, wound repair and post-procedure recovery. AHK-Cu is a cheap hair-serum add-on, not a treatment, and it is not the better peptide.

GHK-Cu 7.4 and strong recommend, AHK-Cu 6.5 and worth trying. That 0.9 gap is real and it comes almost entirely from evidence, not from mechanism.
The shelf sells them as siblings. They differ by one amino acid: glycine in GHK-Cu, alanine in AHK-Cu. GHK-Cu is the human peptide, AHK-Cu is synthetic.
AHK-Cu is marketed as the hair one and GHK-Cu as the skin one. The scores only half agree: GHK-Cu takes skin 9.0 to 2.0, but it also outscores AHK-Cu on hair and nails, 4.5 to 2.8.
AHK-Cu's entire specific evidence base is one in-vitro and ex-vivo study from 2007 (Pyo). No human trial, no replication in almost two decades.
GHK-Cu has a multicenter randomized diabetic ulcer trial (Mulder 1994) showing 98.5% median area closure against 60.8% with vehicle.
Cost points the same way. GHK-Cu topicals run about $30 to $100 a month. AHK-Cu serums are an ESTIMATE of about $74 to $115 a month, so the weaker peptide is also the pricier one.
Both are OTC cosmetics with the same copper risks. Wilson disease, known copper overload, copper hypersensitivity, pregnancy and lactation rule out both.
Check the INCI name before you buy. Copper Tripeptide-1 is GHK-Cu. Copper Tripeptide-3 is AHK-Cu. They get mislabeled constantly.

At a Glance

Option A

AHK-Cu (Copper Tripeptide)

6.5 / 10 Worth trying

Upside

Efficacy 3.6
Breadth 2.9
Evidence 3.2
Speed 2.8
Durability 2.4
Bioindividuality 3.4

Downside

Safety Risk 1.6
Side Effects 1.7
Cost 2.4
Effort 2.2
Opportunity Cost 3.0
Dependency 1.7
Reversibility 1.5

Best at:

Hair Nail 2.8
Skin Beauty 2.0
Wound Healing 1.8
Anti Inflammatory 1.6

Synthetic copper tripeptide, Alanine-Histidine-Lysine plus copper, sold as a hair serum. BioHarmony 6.5, worth trying, moderate confidence.

Read full BioHarmony report →

Head-to-Head Verdict

Use Case	Winner	Rationale
Skin Beauty	GHK-Cu	GHK-Cu 9.0 against AHK-Cu 2.0, the widest gap here and the least arguable. GHK-Cu's wrinkle, firmness, collagen, elastin and barrier mechanisms converge across human and ex vivo work, with Pickart 2015 as the skin-regeneration anchor. There is no AHK-Cu skin study at all. Anyone putting AHK-Cu on their face is borrowing plausibility from a cousin molecule, per Pickart 2008.
Wound Healing	GHK-Cu	GHK-Cu 8.0 against AHK-Cu 1.8. Mulder 1994 randomized diabetic plantar ulcers and reported 98.5% median area closure against 60.8% with vehicle, plus lower infection incidence. That is a human outcome. AHK-Cu has no wound study in people, animals or a dish. Copper is a real cofactor in tissue repair, so the idea is coherent, but coherence is not a result.
Hair Nail	Tie	Call it a tie: the marketing is wrong in both directions. GHK-Cu scores higher, 4.5 against 2.8, but its hair case rests on class familiarity rather than human regrowth trials. AHK-Cu scores lower, and hair is its only direct data: follicle elongation and dermal-papilla proliferation ex vivo, per Pyo 2007. Neither has a human hair trial, so treat both as adjuncts to minoxidil or red light therapy.
Anti Inflammatory	GHK-Cu	GHK-Cu 7.0 against AHK-Cu 1.6. Copper-tripeptide biology intersects with IL-6, TGF-beta and tissue remodeling, reviewed in Pickart and Margolina 2018, and Hostynek 2011 quantified how much copper actually crosses human skin from a copper tripeptide. No AHK-Cu inflammation endpoint has ever been measured, in any model, so its score is theory with nothing under it.
Recovery Repair	GHK-Cu	GHK-Cu 7.0 against AHK-Cu 1.6. Collagen remodeling, angiogenesis signaling and fibroblast support line up across topical and cellular evidence, with Pickart 2014 as the anchor and Pollard 2005 showing growth-factor effects in irradiated fibroblasts. Recovery outcomes outside skin are under-tested on the GHK-Cu side and untested on the AHK-Cu side.
Longevity	GHK-Cu	GHK-Cu 6.5 against AHK-Cu 1.5, and neither earns a longevity claim. Pickart 2014 and Pickart 2018 describe broad gene-expression effects, but no human lifespan or systemic injection trial validates an outcome. AHK-Cu sits at the floor because a topical hair cosmetic has no pathway to an aging process. Longevity framing on either product page is marketing.

Cost Comparison

Intervention	Monthly Cost	Notes
AHK-Cu	About $74 to $115	ESTIMATE, priced 2026-09-08, ordinary retail cosmetic channel. Neurogan's 4 percent copper-peptide hair serums run $148 to $185 for the AHK plus GHK blend and $183 to $229 for AHK-only, per 60 mL bottle covering 60 days. Daily use works out to roughly $74 to $115 a month.Treat that as a shelf-price estimate, not a measured price you are guaranteed to pay. Note what the blend pricing implies: the AHK-only bottles cost more than the ones that also contain the better-evidenced peptide.
GHK-Cu	About $30 to $100	Read from the GHK-Cu report's own pricing, 2026-09-08, retail channel. Serums and creams at 0.5 to 3 percent run about $30 to $100 a month for a daily topical trial, which is also the route with human outcome support.Injectable vials and commercial patch programs run higher, and neither has a human trial behind it. Paying more to move to a route with less evidence is the wrong direction.
The difference	GHK-Cu is cheaper by roughly $15 to $44 a month	Compare the low ends and it is $30 against $74. Compare the high ends and it is $100 against $115. Either way the peptide with the human trial data costs less than the one without it, which removes the usual reason to settle for the weaker option.One caveat that matters for the comparison: the AHK-Cu figure carries an ESTIMATE flag from a single vendor's serum line, while the GHK-Cu figure comes from the report's own pricing work. Do not treat the $15 gap at the high end as precise.

When to Switch

Judge them on different clocks, because the two reports set different windows. GHK-Cu's assessment window is 12 weeks, with a first noticeable change around 4 weeks and full effect at 12.

AHK-Cu's window is 16 weeks, first noticeable at 8 weeks and full effect at 6 months, and those figures are estimated rather than measured. GHK-Cu tells you whether it works in about a quarter of the time AHK-Cu takes.

Move from AHK-Cu to GHK-Cu when the goal is skin, post-procedure redness, barrier repair or anything wound-adjacent. That is a correction more than a switch, because AHK-Cu has no data in any of those.

Move for hair too if you have run 16 weeks of AHK-Cu with no change, since GHK-Cu carries the higher hair-nail subrating and costs less. The only reason to run AHK-Cu instead is that you want the peptide with the single follicle study, knowing it is one dish study from 2007.

Do not stack them expecting more. Combination serums exist, often marketed as 10 percent GHK-Cu plus 5 percent AHK-Cu, but the mechanisms are near-identical copper delivery and no study shows an additive effect.

Two actives in one bottle also means you cannot attribute a result to either one. If you use a blend, treat it as a GHK-Cu product that happens to contain AHK-Cu, and keep both away from strong acids and vitamin C in the same application window because of pH and irritation conflicts.

Who Should Pick What?

Adult over 40 with photoaged or thinning skin

GHK-Cu

Skin-beauty subrating 9.0 against 2.0, and older, collagen-depleted skin is the clearest responder profile in the GHK-Cu report. A 0.5 to 3 percent serum once or twice daily is the whole protocol. AHK-Cu has no skin study to offer this person.

Recovering from microneedling, laser or a chemical peel

GHK-Cu

Wound-healing 8.0 against 1.8. The report's post-procedure protocol is a 2 to 3 percent serum once or twice daily for 5 to 7 days on clinician-cleared skin. Li 2015 showed microneedle pretreatment raises how much peptide and copper actually get through. Use sterile products after needling.

Early androgenic hair thinning, already on minoxidil

Tie

Either, and expect little from both. GHK-Cu scores 4.5 on hair-nail and AHK-Cu 2.8, but neither has a human regrowth trial, so this is the row where the copper peptide is the add-on and minoxidil, microneedling or red light therapy is the actual treatment. GHK-Cu is cheaper if you want to pick on price.

You want the peptide with a hair-follicle study specifically

AHK-Cu (Copper Tripeptide)

This is the one job AHK-Cu owns. Pyo 2007 elongated human hair follicles ex vivo and raised dermal-papilla cell proliferation, and it is the only AHK-Cu-specific study that exists. Go in knowing it is a dish and tissue result from 2007, never replicated, with a non-significant apoptosis endpoint and no human data behind it.

Chronic or diabetic wound, under medical supervision

GHK-Cu

Mulder 1994 is the trial that matters: multicenter, randomized, evaluator-blinded, 98.5% median ulcer area closure against 60.8% with vehicle and lower infection incidence. This belongs with a clinician rather than a shopping cart. AHK-Cu has nothing in this space.

Wilson disease, copper overload, pregnancy or lactation

Tie

Neither. Both reports list Wilson disease, known copper overload or hypersensitivity, pregnancy and lactation as contraindications, and both work by delivering copper into tissue. GHK-Cu adds active malignancy and suspicious skin lesions to that list. There is no version of this comparison where one side is the safe workaround.

Shopping a blended copper serum and unsure what you are buying

GHK-Cu

Read the INCI name, not the marketing. Copper Tripeptide-1 is GHK-Cu and Copper Tripeptide-3 is AHK-Cu, and they get swapped constantly, per Wang 2021. If you can only verify one ingredient, verify that you are getting GHK-Cu, because that is the one with human outcome data.

Research Highlights

Mechanism Difference
These two peptides differ by a single amino acid. GHK-Cu is glycine, histidine and lysine bound to copper. AHK-Cu swaps the glycine for alanine. Both act as copper carriers, delivering Cu2+ into skin and follicle tissue where it works as a cofactor for lysyl oxidase and collagen and elastin cross-linking.The mechanisms are redundant, not complementary. Both target copper, lysyl oxidase, collagen I, elastin and VEGF. GHK-Cu's target list runs further, adding decorin, MMP-2, TIMP-1 and SOD1, and Pickart 2015 documents the wider gene-expression program. Stacking them duplicates one job rather than covering two.
Safety Comparison
Neither peptide is dangerous as a topical, and both share the same core risk, which is copper. Wilson disease, known copper overload, copper or peptide contact hypersensitivity, pregnancy and lactation rule out both. Worst-case topical outcome on either is transient irritation or contact sensitivity.Two differences change decisions. GHK-Cu adds active malignancy and suspicious skin lesions to its contraindication list, because it signals for repair and angiogenesis. AHK-Cu adds broken or actively inflamed skin and warns against strong exfoliant acids or vitamin C in the same application. Injection is off-label and unstudied on both sides.
Cost Comparison
GHK-Cu topical serums and creams run about $30 to $100 a month for daily use, read from the report's own pricing on 2026-09-08. AHK-Cu serums are an ESTIMATE of about $74 to $115 a month, based on one vendor's 4 percent copper-peptide hair serums at $148 to $229 per 60-day bottle.The peptide with the human trial data is the cheaper one, by roughly $15 to $44 a month depending on which end of each range you land on. Treat the AHK-Cu number as a shelf estimate from a single product line rather than a measured market price.
Editorial Verdict
GHK-Cu scores 7.4 and AHK-Cu 6.5, and unlike a lot of close pairs, that gap means something. GHK-Cu takes skin 9.0 to 2.0 and wound healing 8.0 to 1.8, on the back of a randomized diabetic ulcer trial and a documented gene-expression program.AHK-Cu's whole specific record is one in-vitro and ex-vivo study from 2007, per Pyo, never replicated. It owns exactly one job: it is the copper peptide with a hair-follicle study attached to its own name. Even there GHK-Cu scores higher, 4.5 to 2.8, so buy AHK-Cu only if that single study is what you are after.
Naming Confusion
The single most expensive mistake in this category is buying the wrong molecule. Copper Tripeptide-1 is GHK-Cu. Copper Tripeptide-3 is AHK-Cu. Vendors mislabel them routinely, and Wang 2021 reviews the tripeptide class the labels are borrowed from.It bends the research too. The QR678 hair cocktails and injectable hair pilots that look like AHK-Cu evidence list Copper Tripeptide-1, which is GHK-Cu, per Liu 2020 and Kapoor 2018. A third peptide, DAHK, scavenges copper rather than donating it, per Bal 2001, and shows up in Ala-His-Lys searches as the opposite of what you want.

Frequently Asked Questions

What is the difference between AHK-Cu and GHK-Cu?: One amino acid. GHK-Cu is glycine, histidine and lysine bound to copper. AHK-Cu swaps the glycine for alanine. GHK-Cu occurs naturally in human plasma. AHK-Cu is synthetic. Both carry copper into skin and follicle tissue for collagen and elastin cross-linking, so the mechanisms are nearly the same. The evidence behind them is not.
Is AHK-Cu better than GHK-Cu for hair?: No, and this is the most common misconception about the pair. AHK-Cu is marketed as the hair peptide and it does hold the only hair-specific study, Pyo 2007, which elongated follicles ex vivo. But GHK-Cu still scores higher on hair and nails, 4.5 against 2.8, and neither has a human regrowth trial. Treat either as an adjunct to minoxidil, microneedling or red light therapy.
Which one should I use on my face?: GHK-Cu, at 0.5 to 3 percent, once or twice daily. Its skin-beauty subrating is 9.0 against AHK-Cu's 2.0, and that gap exists because AHK-Cu has no skin study of any kind. Every face claim made for AHK-Cu is borrowed from GHK-Cu practice.Older, photoaged or collagen-depleted skin is the clearest responder group. Separate it from strong acids and retinoids in the same application window to avoid pH and irritation conflicts.
How much evidence does AHK-Cu actually have?: One study. Pyo 2007 tested AHK-Cu in vitro and ex vivo, showing hair follicle elongation and dermal-papilla cell proliferation, with a non-significant apoptosis endpoint. It has never been replicated in almost two decades, and there is no human trial. Everything else you will read about copper peptides, including the injectable hair cocktails, is GHK-Cu evidence wearing the wrong label.
Can I use both at the same time?: You can, and blends exist, often sold as 10 percent GHK-Cu plus 5 percent AHK-Cu. There is no evidence of an additive effect, and the mechanisms are close to identical, so you are mostly paying twice for the same copper delivery job.Running both also means you cannot attribute any result to either one. If you use a blend, judge it as a GHK-Cu product.
How long until I know if a copper peptide is working?: GHK-Cu's assessment window is 12 weeks, with a first noticeable change around 4 weeks and full effect at 12. AHK-Cu's window is 16 weeks, first noticeable at 8 weeks and full effect at 6 months, and those AHK-Cu figures are estimated rather than measured. GHK-Cu gives you an answer in roughly a quarter of the time.
Which is cheaper?: GHK-Cu. Its topicals run about $30 to $100 a month. AHK-Cu serums come out at an ESTIMATE of roughly $74 to $115 a month, from one vendor's 4 percent hair serums at $148 to $229 per 60-day bottle. The better-evidenced peptide is the cheaper one, which is unusual and worth acting on.
Who should avoid both?: Anyone with Wilson disease, known copper overload or unexplained high copper markers, and anyone with copper or peptide contact hypersensitivity. Pregnancy and lactation rule out both, since neither has cosmetic safety data in those groups.GHK-Cu adds active malignancy and suspicious skin lesions, because it signals for repair and angiogenesis. AHK-Cu adds broken or actively inflamed skin. Skip injectable use of either. It is off-label, non-approved and unstudied.
How do I make sure I am buying the right one?: Read the INCI name. Copper Tripeptide-1 is GHK-Cu. Copper Tripeptide-3 is AHK-Cu. Vendors mislabel them routinely, and product pages often cite GHK-Cu research on an AHK-Cu bottle. If the label says Copper Tripeptide-1 and the marketing talks about AHK, the marketing is wrong. Buy on the INCI name and the stated percentage, not on the peptide the headline names.

Evidence Sources

Preclinical The effect of tripeptide-copper complex on human hair growth in vitro (Pyo 2007) (2007) AHK-Cu elongated human hair follicles ex vivo and increased dermal-papilla cell proliferation in vitro. The only AHK-Cu-specific study, never replicated, with a non-significant apoptosis endpoint.
RCT Enhanced healing of ulcers in patients with diabetes by topical GHK-Cu (Mulder 1994) (1994) Multicenter randomized evaluator-blinded diabetic ulcer trial. 98.5% median area closure against 60.8% with vehicle, and lower ulcer infection incidence.
Review GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration (Pickart 2015) (2015) Review of GHK skin regeneration, collagen, glycosaminoglycans, immune-cell attraction and gene-expression pathways.
Review GHK and DNA: Resetting the Human Genome to Health (Pickart 2014) (2014) Gene-expression review reporting DNA repair, antioxidant, tissue repair and fibrosis-related pathway modulation. Not a human endpoint trial.
Review Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data (Pickart and Margolina 2018) (2018) Review of GHK-Cu regenerative and protective pathways across skin, hair, COPD fibroblast, DNA repair and proteasome framing.
Mechanistic Human skin penetration of a copper tripeptide in vitro as a function of skin layer (Hostynek 2011) (2011) Ex vivo human skin diffusion study quantifying dermatomed-skin copper permeability and tissue retention from GHK-Cu.
Mechanistic Microneedle-Mediated Delivery of Copper Peptide Through Skin (Li 2015) (2015) Microneedle pretreatment enabled 134 +/- 12 nmol peptide and 705 +/- 84 nmol copper permeation through human skin in 9 hours.
Preclinical Copper-GHK increases integrin expression and p63 positivity by keratinocytes (Kang 2009) (2009) Keratinocyte and skin-equivalent study showing increased PCNA, p63, integrin alpha6 and beta1 expression.
Preclinical Effects of Copper Tripeptide on the Growth and Expression of Growth Factors by Normal and Irradiated Fibroblasts (Pollard 2005) (2005) In vitro fibroblast study in normal and irradiated fibroblasts. Supports tissue-repair and post-radiation skin biology.
Review The human tripeptide GHK and copper-GHK in tissue remodeling and skin repair (Pickart 2008) (2008) Foundational GHK and GHK-Cu mechanistic review. Cited here to show how much deeper the cousin's record runs than AHK-Cu's.
RCT Topical copper tripeptide complex on CO2 laser-resurfaced skin (Miller 2006) (2006) GHK-Cu clinical skin study reporting reduced erythema after laser resurfacing. Not AHK-Cu.
Review Review of tripeptide and hexapeptide topical esthetics formulations (Wang 2021) (2021) Class review of tripeptide and hexapeptide topical esthetics covering the GHK family. Class context, not AHK-Cu evidence.
Preclinical The QR678 hair growth formulation containing Copper Tripeptide-1 (Liu 2020) (2020) Multi-factor hair cocktail listing Copper Tripeptide-1, which is GHK-Cu rather than AHK-Cu. Cited to flag the naming confusion.
Trial Intradermal hair growth factor formulation containing Copper Tripeptide-1, first-in-man pilot (Kapoor 2018) (2018) Multi-factor injectable pilot with no control arm and no peptide isolation. Copper Tripeptide-1 is GHK-Cu, so this is not AHK-Cu evidence.
Mechanistic DAHK, an analog of the human albumin N-terminus, prevents copper-induced reactive oxygen species (Bal 2001) (2001) DAHK is a different albumin-fragment tetrapeptide that scavenges copper rather than donating it. Disambiguation context for Ala-His-Lys searches.
Regulatory FDA 503A bulk substances update for GHK-Cu (2026) No FDA-approved therapeutic indication for GHK-Cu. The 503A bulk-substance posture is in transition with PCAC consultation expected.

Glossary

Quick reference for the medical and technical terms used in this comparison.

GHK-Cu Glycyl-L-Histidyl-L-Lysine Copper: The human copper-binding tripeptide found in plasma, sold topically as Copper Tripeptide-1. The better-studied of the two, with human wound and skin data.
AHK-Cu Alanyl-Histidyl-Lysine Copper: A synthetic copper tripeptide sold as Copper Tripeptide-3, marketed for hair. Differs from GHK-Cu by one amino acid and has one study to its name.
INCI International Nomenclature of Cosmetic Ingredients: The standardized ingredient naming system on cosmetic labels. The only reliable way to tell which copper peptide is actually in the bottle.
DAHK Aspartyl-Alanyl-Histidyl-Lysine: An albumin-fragment tetrapeptide that scavenges copper rather than delivering it. It shows up in Ala-His-Lys searches and does the opposite job of AHK-Cu.
VEGF Vascular Endothelial Growth Factor: The signal that drives new blood-vessel growth. Both peptides are proposed to raise it, which is the mechanistic basis for the follicle and repair claims.
LOX Lysyl Oxidase: A copper-dependent enzyme that cross-links collagen and elastin. It is the reason delivering copper to skin has a plausible structural effect at all.
SOD1 Superoxide Dismutase 1: A copper-dependent antioxidant enzyme. It is listed among GHK-Cu's targets and is the basis for the antioxidant framing on that side.
MMP Matrix Metalloproteinase: Enzymes that break down the extracellular matrix. GHK-Cu is described as balancing MMP and TIMP activity, which is the remodeling half of its skin story.

Nick Urban Health Optimization Researcher & CHEK Holistic Lifestyle Coach Level 2

GHK-Cu is rated 6.9 in the researching column, noted for patches and topicals preferred over injection

Reviewed Sep 8, 2026 · next review Dec 7, 2026

Find which one fits your biology

Take the BioHarmony Quiz