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whatsApp({+447426976269})GHK-Cu Peptide: Benefits, safety, dosage, and how it works
Can this copper peptide really promote hair growth and reduce signs of aging? We cover all you need to know in this guide.
Though accepting the passage of time and all that comes with it is an entirely valid choice, you’re far from alone if you’d rather try to fight it, or at least try to reduce its impacts on your physical appearance. In 2024 alone, the global antiaging products market was worth an estimated $52.44 billion, and it’s estimated to grow by nearly 8% from 2025 to 2030.1

As dermaceutical innovation expands, more and more promising products with new active ingredients are being thrust into the spotlight. One such ingredient is GHK-Cu, a copper peptide complex that manufacturers say can do everything from reducing wrinkles and growing hair to fading scars, healing wounds, and more. But is there evidence to back up these claims?


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In this guide to GHK-Cu, we’ll cover what you need to know about this peptide, including its safety, efficacy, use cases, and everything in between. If you’ve already determined you’d like to try treatments, you may know that GHK-Cu is available as either a nonprescription topical or a prescription injectable. For those of you interested exclusively in the nonprescription topicals, we recommend checking out our guide to the best copper peptide serum. There, you’ll find a rundown of the highest-quality products along with the most detailed analysis of topical GHK-Cu as a skincare approach and can decide what’s best for you. If your interest includes prescription injectable options or you aren't sure, read on as we thoroughly explore this therapeutic peptide.

Why you should trust us
Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions involving staying healthy and living healthier lifestyles.


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Our team has dedicated thousands of hours over the past few years to learning about a variety of peptides, one of which is the copper peptide GHK-Cu. We’ve spent 40+ hours researching all you need to know about this promising peptide — its origin, uses, safety, efficacy, and more. We also spoke with doctors who are well-versed in peptide therapy to gather valuable information on proper application, side effects, reactions, and contraindications, among other details. A member of our team has even personally undergone peptide therapy, enabling us to provide information about the patient experience that can only be gained from hands-on experience.

Additionally, like all health-related content on this website, this review was thoroughly vetted by one or more members of our Medical Review Board for accuracy.

What is GHK-Cu?
GHK-Cu is a complex consisting of the tripeptide GHK (glycyl-histidyl-lysine) and copper (Cu).2 GHK was discovered in 1973 by Dr. Loren Pickart, who found that it caused older human liver tissue to produce proteins more characteristic of younger tissue.2 3 This resulted in GHK being originally described, specifically, as a liver cell growth factor. However, as research continued, experts found that GHK could modulate a number of different cells besides those in the liver.4

GHK is naturally found in human saliva, plasma, and urine, but its standard levels are reduced by over half once you reach age 60. As researchers note, this decline “coincides with the noticeable decrease in regenerative capacity of an organism.”2 This suggests that, for example, lower natural GHK levels may contribute to things like slower wound healing in older adults.5

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What is GHK-Cu used for?
According to experts, GHK has a “strong affinity for copper” and “readily” links up with it to form GHK-Cu. In this form, the peptide complex appears to have strong protective and regenerative properties.3

These properties are why you’ll find GHK-Cu copper peptides (usually listed in ingredient lists under the name Copper Tripeptide-1) in various cosmetics, with skin care products being some of the most popular use cases. According to a 2018 review, GHK-Cu as a cosmetic ingredient has demonstrated the ability to:3

Tighten loose skin
Reverse age-related skin thinning
Repair the skin’s protective barrier proteins
Improve skin firmness and elasticity
Reduce the appearance of fine lines and wrinkles
Smooth rough skin
Stimulate wound healing
Lessen the appearance of photodamage (sun damage), hyperpigmentation, skin spots, lesions, and more
Reduce inflammation and damage from free radicals
Increase hair growth and thickness
Additionally, in research from 2015, the authors noted that GHK-Cu may be able to stimulate collagen, regulate the skin remodeling process, attract immune cells to the site of an injury, and restore “replicative vitality to fibroblasts” (a cell that helps form connective tissue) in patients who’ve undergone radiation therapy for cancer.2 6


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GHK-Cu isn’t limited to topical/cosmetic forms, however. It’s also an injectable treatment, for which growing evidence supports its applicability to numerous physiological and even psychiatric health concerns.

To help you better understand how GHK-Cu works, let’s break down some of the research behind the peptide’s potential applications as both a cosmetic ingredient and a prescription injectable.

Topical/cosmetic GHK-Cu
Human studies on GHK-Cu have primarily focused on the topical route of administration. The findings of these studies, along with animal research, demonstrate why GHK-Cu has become a popular ingredient in topicals intended to reduce a host of skin- and hair-related concerns.

Skin aging
In a 2018 review, the authors detailed multiple positive studies and trials on the use of GHK-Cu for signs of skin aging. One trial had 71 women with “mild to advanced signs of photoaging” apply a facial cream containing GHK-Cu daily for three months and found that the treatment increased skin density and thickness while reducing sagging and the appearance of fine lines and wrinkles. In another trial, 41 women with “mild to advanced photodamage” applied GHK-Cu eye cream for three months and saw reduced lines and wrinkles, improved skin density, and increased skin thickness better than both placebo and vitamin K cream.3
Similarly, in a pilot study investigating copper tripeptide topicals for aged skin, experts found that they increased skin thickness and elasticity, improved hydration, and boosted collagen synthesis.3
Hair growth
In a review from 2023, experts explained that GHK-Cu may promote hair growth in a few different ways. The first is by stimulating fibroblasts and promoting the formation of new blood vessels to help hair follicles receive the necessary nutrients for growth; the second is by inhibiting growth factor beta, thereby preventing hair follicles from prematurely shrinking; and the third is by supporting dermal papilla cells (an important cell for healthy hair formation) to stimulate hair growth.7 8
Wound healing
GHK-Cu has demonstrated wound-healing abilities in animal models. In one rabbit study, it improved “wound contraction and formation of granular tissue,” boosted antioxidant enzymes, and stimulated blood vessel development and growth. In a separate study on rats, a collagen dressing with GHK-Cu accelerated the healing of wounds in both healthy and diabetic subjects.3
However, researchers point out that GHK-Cu is “very sensitive” to breakdown by certain enzymes. Wounds like diabetic skin ulcers and bedsores often develop something called a “wound serum” that contains such enzymes. This “serum” breaks down GHK-Cu, rendering it ineffective


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