SoftMaxx AI sells no peptides and takes no vendor money.
Human, small or uncontrolled Topical GHK-Cu has only a few small human studies: a 2026 review lists a 13-person post-laser study that was negative on objective measures and an 18-person eyebrow study, and calls the clinical evidence sparse, while a 2025 review notes a 'surprising absence of clinical studies'. For injected GHK-Cu, FDA says there are limited data in humans, and it flags a risk of immune reactions.[1][2][3]
Side by side
| On the skin (topical) | Injected | |
|---|---|---|
| Human efficacy studies | A few small ones; reviewers call the evidence thin [4] [1] | None found; FDA says human data are limited [3] |
| Human safety data | Small studies; we found no problems reported | Limited, per FDA [3] |
| Gets where it is meant to go? | Lab results differ: one review calls skin permeation limited [5], another relatively good [2] | We found no human data |
| FDA status | Used in cosmetic anti-wrinkle products [2]; non-injectable forms are in compounding Category 1, "Under Evaluation" | We found no FDA-approved product in Drugs@FDA [6]; FDA lists it as nominated but withdrawn from Category 2 [3], and it is in none of the 503A categories [7] |
| Health Canada | We found no product in the Drug Product Database [8] | Named in a 2026 warning on peptides bought online [9] |
The two are different products with different evidence. Results for one do not carry over to the other.
- Expert review A 2026 systematic review calls the human literature on GHK-Cu thin and fragmented, a second 2026 review calls the clinical evidence sparse, and a 2025 review notes a surprising absence of clinical studies.[4][1][2]
- Regulator document We found no published human trial of injected GHK-Cu; FDA says there are limited data in humans.[3]
Injected GHK-Cu: limited human data
We found no published human trial of injected GHK-Cu, and FDA says there are limited data in humans [3]. We found no human dose that has been studied, so this page lists none.
A 2026 systematic review says microneedle delivery of GHK-Cu has yet to be evaluated in a registered, adequately powered human randomized trial published in the peer-reviewed literature [4]. Blends that include GHK-Cu, as sellers describe them, are covered on the GLOW and KLOW pages.
- In vitro (cells) A 2026 systematic review reports that microneedles greatly raised GHK-Cu uptake in lab and pig-skin models, and that this route has yet to be evaluated in a registered, adequately powered human randomized trial published in the peer-reviewed literature.[4]
- Expert review Reviews describe gray-market injectable peptides as having uncertain identity, purity, potency and sterility, with risks of contamination and inaccurate dosing.[10][11]
- Regulator document Health Canada warns that unauthorized injectable peptides, GHK-Cu among those it has seized, can lead to infections.[9]
What FDA and Health Canada say
FDA had listed injectable GHK-Cu in compounding Category 2, its significant-safety-risk list [3]. It left because the nominators withdrew, not because FDA cleared it; FDA's page listing it as withdrawn is dated 2026-04-22 [3], and injectable GHK-Cu appears in none of FDA's 503A category lists updated 2026-05-14 [7].
Non-injectable GHK-Cu is different: it is in Category 1, "Bulk Drug Substances Under Evaluation" [7]. FDA says it intends to consult its compounding advisory committee before the end of February 2027 on adding GHK-Cu to the 503A bulks list; the nomination still on file covers non-injectable routes [7].
- Regulator document FDA's compounding safety page cites possible immune reactions and limited human data for injectable GHK-Cu.[3]
- Regulator document FDA's nominations list records GHK-Cu's compounding categories by route.[7]
- Regulator document Health Canada warned in April 2026 against injecting peptides bought online, naming unauthorized products.[9]
The "injecting works better" myth
We found no trial showing that injecting is stronger. FDA says human data on injected GHK-Cu are limited [3], and we found no FDA-approved GHK-Cu product in Drugs@FDA [6].
We also found no human data on injected GHK-Cu in pregnancy, or for people with copper-handling disorders.
- Common belief
Injecting GHK-Cu works better than putting it on skin
No supporting study We found no published human trial of injected GHK-Cu. FDA flags a risk of immune reactions and says human data are limited.[3]
Topical GHK-Cu: small studies, real limits
On the skin, GHK-Cu is widely used in anti-wrinkle cosmetic products, and a 2025 review that calls it an anti-wrinkle ingredient on the strength of cellular studies also notes a surprising absence of clinical studies [2].
The main question is delivery. GHK-Cu is water-loving, and one review calls its permeation through the skin's outer layer limited [5], while a lab test found copper from it crossing excised skin [12].
- Animal GHK-Cu raised collagen in cultured fibroblasts and in rat wound chambers.[13][14]
- In vitro (cells) In a lab test on excised human skin, copper from GHK-Cu crossed the skin under an unlimited-dose setup far heavier than a thin serum layer; the authors called the amount potentially effective for inflammatory disease.[12]
- Case report A published human case report used GHK-Cu with four other actives and a device, so the effect cannot be isolated.[15]
- Regulator document Under FDA rules, a product intended to affect the structure or any function of the body meets the legal definition of a drug. A product can be both a cosmetic and a drug; its intended use, shown by its claims, decides.[16]
If you use a topical: measure it
If you try a copper-peptide serum, make it a measured experiment.
Scan with SoftMaxx AI before you start, in steady light with no makeup. Add one product at a time. Rescan every 4 weeks for 12 weeks and read the trend, not a single score. The skin score is an AI read of a photo, not a diagnosis. See what the trials measured.
Doses used in studies (not a recommendation)
These are the amounts given to the people, animals or cells in the cited studies, copied as reported. They are a record of what was tested, not dosing instructions, and nothing here says what you should take.
| Studied in | Route | Amount reported | How often | How long | n | Source |
|---|---|---|---|---|---|---|
| human | topical, with a microdroplet resurfacing device | not reported (multi-ingredient solution) | once weekly | 12 weeks | 1 | [15] Case report, one 59-year-old man. |
Side effects and risks
- Regulator document Injected: possible immune reactions from aggregation and peptide-related impurities (flagged by FDA)[3]
- Expert review Injected gray-market products: uncertain identity, purity and sterility (reviews)[11][10]
- Regulator document Unauthorized injectable peptides, GHK-Cu among them: Health Canada warns of infections, allergic reactions and other serious complications[9]
- Case report Topical, with four other actives and a device: no adverse effects in a published case report[15]
Regulatory status (checked 2026-09-30)
- United States (FDA)We found no FDA-approved product containing GHK-Cu in Drugs@FDA (searched 2026-10-01). (FDA:
Drugs@FDA search: ghk-cu — no approved product found
) FDA lists GHK-Cu (except for injectable routes of administration) in 503A Category 1, “Bulk Drug Substances Under Evaluation” (list updated 2026-05-14). (FDA:Bulk Drug Substances Nominated for Use in Compounding Under Section 503A of the Federal Food, Drug, and Cosmetic Act
) - CanadaWe found no product containing GHK-Cu in Health Canada’s Drug Product Database (searched 2026-10-01). (Health Canada:
Health Canada Drug Product Database search: ghk-cu — no product found
) Health Canada named GHK-Cu in “Think twice before injecting peptides bought online: unauthorized products can seriously harm you”. (Health Canada:Think twice before injecting peptides bought online: unauthorized products can seriously harm you
) Health Canada named GHK-Cu in “Unauthorized injectable peptide drugs seized and sold by Canada Peptide may pose serious health risks”. (Health Canada document) Health Canada named GHK-Cu in “Unauthorized injectable peptide drugs seized from Optimum Wellness Centre in Calgary, Alberta may pose serious health risks”. (Health Canada document) Health Canada named GHK-Cu in “GHK-Cu & BPC-157 powder: Unauthorized active pharmaceutical ingredients”. (Health Canada document) - Sport (WADA)WADA’s Prohibited List does not name GHK-Cu. WADA states that topical cosmetic products may contain prohibited peptides or growth factors and that using cosmetic products containing such substances is prohibited; we found no WADA statement on whether GHK-Cu is one of them. (WADA:
World Anti-Doping Code International Standard Prohibited List 2026
; WADA:World Anti-Doping Agency Prohibited List
)
Official sources: FDA: Bulk Drug Substances Nominated for Use in Compounding Under Section 503A of the Federal Food, Drug, and Cosmetic Act
· FDA: Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks
· WADA: World Anti-Doping Code International Standard Prohibited List 2026
· WADA: World Anti-Doping Agency Prohibited List
· Health Canada: Think twice before injecting peptides bought online: unauthorized products can seriously harm you
· Health Canada document 1 · Health Canada document 2 · Health Canada document 3
Report a side effect
If something went wrong after using any product, tell a clinician and report it. Reports are how regulators find contaminated or mislabeled products.
- FDA MedWatch (United States)
- Canada Vigilance Program (Canada)
Common questions
Is GHK-Cu topical or injection?
Both are sold. On the skin, GHK-Cu is used in cosmetic anti-wrinkle products, and non-injectable GHK-Cu is in FDA's compounding Category 1. Injectable GHK-Cu is among the unauthorized peptides Health Canada has seized, and FDA says human data on injected GHK-Cu are limited.[2][7][9][3]
Is GHK-Cu safe to inject?
FDA says there are limited data in humans to inform its safety, and it flags possible immune reactions from aggregation and peptide-related impurities.[3]
Does GHK-Cu work topically?
Unproven. Cell and rat results are strong, but a 2025 review notes a surprising absence of clinical studies.[13][14][2]
Is GHK-Cu FDA approved?
We found no FDA-approved GHK-Cu product, in either form, in Drugs@FDA. Non-injectable GHK-Cu is in compounding Category 1, which is not an approval. FDA's safety page lists injectable GHK-Cu among substances whose Category 2 nominations were withdrawn.[3][7] Source: FDA: Drugs@FDA search: ghk-cu — no approved product found
Is GHK-Cu banned by WADA?
WADA's Prohibited List does not name GHK-Cu. WADA states that topical cosmetic products may contain prohibited peptides or growth factors and that using cosmetic products containing such substances is prohibited; we found no WADA statement on whether GHK-Cu is one of them.[17] Source: WADA: World Anti-Doping Code International Standard Prohibited List 2026
; WADA: World Anti-Doping Agency Prohibited List
References
Every reference below was matched to its PubMed or DOI record (title checked) before publication. "Verified" means the paper exists and is the one named; what it supports is stated next to each claim.
GHK-Cu as a Bioactive Metallopeptide and Drug-Delivery Cargo: Coordination Chemistry, Formulation Science, Therapeutic Evidence, and a Translational Roadmap.
PubMed 42797253 DOITopically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective.
PubMed 39963574 DOICertain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks
SourceA Systematic Review of the Mechanisms and Therapeutic Applications of GHK-Cu (Glycyl-L-Histidyl-L-Lysine-Copper Complex) in Topical Microneedle Delivery: A Case for Expanded Clinical Trials.
PubMed 42787770 DOIAre We Ready to Measure Skin Permeation of Modern Antiaging GHK-Cu Tripeptide Encapsulated in Liposomes?
PubMed 39795193 DOIDrugs@FDA search: ghk-cu — no approved product found (2026-10-01)
SourceBulk Drug Substances Nominated for Use in Compounding Under Section 503A of the Federal Food, Drug, and Cosmetic Act
SourceHealth Canada Drug Product Database search: ghk-cu — no product found (2026-10-01)
SourceThink twice before injecting peptides bought online: unauthorized products can seriously harm you (Health Canada advisory; lists KPV)
SourceUnregulated Peptide Use in the Age of Biohacking: Digital Promotion, Gray-Market Access, and Emerging Public Health Risks.
PubMed 42437212 DOIDangers of Injectable Peptides and Other Unregulated "Biohacking" Drugs.
PubMed 42757290Human skin penetration of a copper tripeptide in vitro as a function of skin layer.
PubMed 20721598 DOIStimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+.
PubMed 3169264 DOIIn vivo stimulation of connective tissue accumulation by the tripeptide-copper complex glycyl-L-histidyl-L-lysine-Cu2+ in rat experimental wounds.
PubMed 8227353 DOISignificant improvement in crow's feet after treatment with Jet-M and a mixed solution of copper-GHK, oligo-hyaluronic acid, rhodiolar extract, tranexamic acid, and β-glucan (GHR formulation).
PubMed 27064823 DOIIs It a Cosmetic, a Drug, or Both? (Or Is It Soap?)
SourceWorld Anti-Doping Agency Prohibited List
Source
Keep reading
- GHK-Cu before and after: what the trials actually measured→
- Best peptides for skin, ranked by evidence→
- GLOW peptide stack: components, evidence and risks→
- KLOW peptide: components, evidence and risks→
- Copper peptides vs retinol: what the evidence shows→
- Peptides for hair growth vs minoxidil and finasteride→
- All peptide pages, by evidence→