GHK-Cu is a naturally occurring copper peptide with strong lab and animal data on collagen and wound repair. Human evidence for skin is limited to small, short studies, and controlled human trials for hair loss are lacking. It is not FDA-approved.
GHK-Cu is a small copper-binding peptide that occurs naturally in the body and has been studied for decades for its role in skin repair. Laboratory and animal research is extensive and fairly consistent: it influences collagen production and wound healing. The human evidence is much thinner, consisting mainly of a handful of small, short cosmetic studies on aging skin, and we found no controlled human trials of GHK-Cu for scalp hair loss. GHK-Cu is not an FDA-approved drug; prescription GHK-Cu creams are compounded products.
GHK stands for glycyl-L-histidyl-L-lysine, a tripeptide made of three amino acids. A 2015 review in BioMed Research International describes it as present in human plasma, saliva and urine, and proposes that it works as a complex with copper. A 2018 review by Pickart and Margolina, whose lead author described GHK in a 1973 thesis, reports that plasma GHK is about 200 ng/mL at age 20 and falls to about 80 ng/mL by age 60. The same review notes that the GHK sequence is part of type I collagen and may be released at the site of an injury, which is one reason researchers think it acts as an early repair signal.
This is where most of the evidence sits. According to the 2015 and 2018 reviews:
These findings are interesting, but cell and animal results do not reliably predict what a cream will do on human skin. The gene data in particular come from computational databases of cell responses, not from measurements in people using GHK-Cu products.
The reviews describe several placebo-controlled cosmetic studies, mostly in women around age 50:
| Study (as described in the reviews) | Participants | Length | Reported findings |
|---|---|---|---|
| Facial cream | 71 women with photoaging | 12 weeks | Improved laxity, clarity, fine lines and skin thickness |
| Eye cream vs placebo and vitamin K cream | 41 women | 12 weeks | Outperformed both comparators on lines and wrinkles |
| Facial cream | 67 women aged 50 to 59 | 12 weeks | Improved firmness, fine lines and mottled pigmentation |
| Thigh skin biopsy comparison | Not stated in the reviews | 1 month (2015 review) or 12 weeks (2018 review) | More collagen in 70% with GHK-Cu vs 50% vitamin C and 40% retinoic acid |
These results are encouraging but come with real limits. The studies are small and short, they measure appearance over weeks rather than long-term outcomes, and the two reviews even describe the length of the thigh study differently. Both reviews also share the same lead author, Loren Pickart, so independent confirmation matters.
Independent assessments are more cautious. A 2024 review in BioImpacts concluded that while cell studies support GHK as an anti-wrinkle ingredient, there is "a surprising absence of clinical studies" using GHK-Cu, and that published information on its skin permeability and effectiveness is insufficient. In a small randomized study published in 2006 in the Archives of Facial Plastic Surgery, 13 patients who had laser skin resurfacing used aftercare with or without GHK-Cu products. Blinded evaluators and computer analysis found no significant difference in redness, wrinkles or overall skin quality, although patients using GHK-Cu reported higher satisfaction.
The 2018 review lists increased hair growth and larger hair follicles among GHK-Cu's proposed benefits, but this rests on laboratory data rather than trials in people with hair loss. In a 2007 laboratory study in Archives of Pharmacal Research, a closely related copper peptide (AHK-Cu, not GHK-Cu) lengthened human hair follicles kept alive outside the body and stimulated the growth of dermal papilla cells, the cells that help drive the hair cycle.
In the sources we reviewed, we did not find controlled human trials showing that GHK-Cu treats pattern hair loss or shedding. If hair loss is your main concern, treatments with established evidence are covered in our article on hair loss treatment options.
No. The FDA states that compounded drugs are not FDA-approved, which means the agency does not verify their safety, effectiveness or quality before they reach patients. Prescription GHK-Cu creams fall into this category.
The FDA has addressed GHK-Cu specifically. On its page about bulk substances that may present significant safety risks in compounding, the FDA notes that compounded injectable drugs containing GHK-Cu may pose a risk of immunogenicity (an unwanted immune reaction) because of possible aggregation and impurities, and that there are limited human data to inform safety. For non-injectable forms, the FDA's 2026 update to its list of nominated substances says GHK-Cu (except injectable routes) is being returned to its category of substances under evaluation, and says the agency intends to consult its Pharmacy Compounding Advisory Committee before the end of February 2027.
GHK-Cu available through NewDay Wellness is a compounded topical cream only, never an injection, and it is not FDA-approved.
Copper peptides, including GHK-Cu, appear in many cosmetic products. The 2018 review notes GHK-Cu is widely used in skin and hair products. Cosmetic products and prescription compounded creams can differ in strength and formulation, so ask your prescriber what a specific product contains.
The human studies described in the reviews ran for about 12 weeks or less, so there is little published information on longer use. Results in those small studies varied, and no outcome can be promised.
The human studies were done with products applied to the skin. The FDA's concerns about immune reactions apply to injectable GHK-Cu, and skin study findings do not transfer to injections.
Given how limited the human evidence is, it is not a substitute for treatments with FDA-approved uses, such as prescription retinoids. See our tretinoin explainer for comparison.
A licensed provider can review your skin goals, history and current products, explain the limits of the GHK-Cu evidence and decide whether a topical cream is appropriate. Strength and use are set by the prescriber. Learn more on the GHK-Cu cream page. This article is educational and does not determine eligibility for any treatment.
Written by the NewDay Wellness editorial team from the sources above and checked against them before publication, and medically reviewed by Dr. Sean Arora and Dr. Shannon Arora of Arora Health & Aesthetics; see our editorial standards. This article is educational and does not diagnose conditions, establish eligibility for any medication, or replace care from a licensed provider. Compounded medications are not FDA-approved.
Tretinoin is a prescription retinoid FDA-approved to treat acne, and one low-strength cream is approved to help soften fine facial wrinkles. Expect dryness or peeling and possible early breakouts, with acne improvement usually taking 6 to 12 weeks.
Read articleTopical minoxidil labels say results may appear at 2 to 4 months for men and 3 to 6 months for women, and the AAD suggests 6 to 12 months to judge. A brief shed early on is common, and benefits last only with continued use.
Read articleSpironolactone is a blood pressure medication that dermatologists prescribe off-label for hormonal acne in women. A 2023 trial found it improved acne more than placebo by 24 weeks. Pregnancy must be avoided, and potassium matters for some people.
Read article