GHK Peptide: neurogenesis, skin, and more

GHK-Cu is a tiny little peptide that can be absorbed transdermally. It is often advertised as a way to reduce skin aging.

While there are some good studies on it as a ‘beauty’ product, that is just the tip of the GHK-Cu iceberg. Let’s dive into the science of what this little peptide can do in the body — and also throw in a dash of cold-hard reality that it’s not a miracle cure-all.

What is GHK-Cu?

GHK stands for Gly–His–Lys, which are the abbreviations for the amino acids that make up this peptide. A peptide consists of a short chain of amino acids and proteins are longer chains.

GHK naturally resides in your bloodstream in small amounts. It can easily bind to copper, and thus you will usually see the peptide as GHK-Cu, with the Cu being the chemical symbol for copper.

Researchers think GHK naturally liberates from extracellular matrix proteins, specifically a collagen chain, in response to soft tissue damage. GHK then promotes wound healing and regeneration of tissues.[ref]

ROS, lung injury from infections:

Acute lung injury, including ARDS, is characterized by inflammation and tissue injury in the small alveoli. This is what kills people with COVID, pneumonia, etc.

To create a tissue model of lung injury, researchers use lipopolysaccharides (LPS). Found on the outer membrane of gram-negative bacteria, lipopolysaccharides cause a big immune response in the body. When added to the lungs, LPS causes an inflammatory response injuring the lung tissue due to high levels of ROS (reactive oxygen species).

Researchers have shown that GHK-Cu suppressed TNF-alpha and IL-6 (inflammatory cytokines) from overexpression. This reduced tissue damage in the lungs when exposed to the lipopolysaccharide (LPS).[ref]

Why is this a big deal? If it works in humans, this could potentially be a way to reduce the lung damage during ARDS or pneumonia. Pneumonia is often caused by gram-negative (LPS) bacteria.

Additional cell culture studies show that GHK reduces ROS levels in cells.[ref] While another cell study showed that GHK could restore function in COPD lung tissue.[ref]

Keep in mind that this research has a long way to go to prove efficacy in people with lung problems, but the mechanism and science here are interesting.

GHK and Gene Expression:

A gene expression analysis computer model shows that GHK changes the gene expression of thousands of genes — upregulating some and downregulating others. Of note, GHK upregulates several DNA repair genes as well as downregulating IGF1.[ref]


The majority of research on GHK-Cu centers around its effects on skin regeneration and wound healing. Research shows that GHK-Cu promotes collagen formation in the skin, which reduces fine lines and improves elasticity.[ref]

In skin culture studies, GHK-Cu increases the survival of stem cells in the skin. Stem cells regenerate skin cells more quickly in younger skin than older skin, so increasing stem cell survival might promote youthfulness of the skin.[ref][ref]

Similar to the effect seen in lung injury models, GHK-Cu also decreases inflammatory cytokines (IL-6 and TNF-alpha) in skin cells.[ref]

Note that a lot of the clinical trials on GHK-Cu for skincare are several decades old and the publications are not readily available on the internet. While many current articles reference these publications, I haven’t been able to read the studies for myself.


A trial using a complex of 5-ALA (another peptide) and GHK found that the peptide complex increased the hair count significantly compared to placebo over a 6 month trial period.[ref]

In an animal model of hair loss, GHK-Cu in solution or in a liposomal form has shown to increase hair growth and increase VEGF expression, thus likely improving blood circulation to the hair follicle.[ref]



The GHK-Cu peptide can be purchased in various places online and often sold as an additive for skin creams. It is a blue-green color from the copper at higher concentrations. Plus, the peptide is small enough to readily transport into the skin.

My take on it: While it is likely not the fountain of youth, the research on GHK-Cu does show that it likely improves the look and feel of skin. The question is always whether your source for purchasing GHK-Cu is legitimate and whether the concentration is high enough to make a difference.

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