Evidence Snapshot
What this grade covers
C-/D+ reflects topical/cellular research on copper-free GHK specifically; systemic/injectable therapeutic evidence remains grade E (not established).
Regulatory Context
Not FDA-approved as a drug; studied primarily in topical/cosmetic and cell-culture research, not as a systemic therapeutic.
Research Takeaway
Copper-free GHK (glycyl-L-histidyl-L-lysine without a complexed copper ion) is chemically distinct from GHK-Cu, the copper(II)-complexed form; the two must not be merged as one compound.
Evidence boundary: Copper-delivery-related claims do not apply to copper-free material without demonstrated copper-complexing in the specific product used.
See all 2 evidence claims →Quick Summary
Copper-free GHK (glycyl-L-histidyl-L-lysine) is the tripeptide form of GHK without a complexed copper ion, chemically distinct from GHK-Cu (the copper(II)-complexed form more commonly sold and studied for skin/wound-healing research). Direct copper-free GHK research includes a 2012 stem-cell-recovery skin study (PMID 23019153), gene-expression work relevant to nervous-system function and cognitive decline (PMID 28212278), a 2015 review of GHK's role in skin-regeneration cellular pathways (PMID 26236730), and a 2025 review of topical anti-wrinkle use (PMID 39963574). This is topical and cell-culture evidence; it does not establish injectable or systemic benefit. The larger GHK-Cu wound-healing/collagen literature does not automatically transfer to copper-free GHK, and copper-delivery-related claims do not apply to copper-free material without demonstrated copper-complexing in the specific product used.
Mechanism & Research Overview
Copper-free GHK (glycyl-L-histidyl-L-lysine) is the tripeptide form of GHK without a complexed copper ion, chemically distinct from GHK-Cu (the copper(II)-complexed form more commonly sold and studied for skin/wound-healing research). Direct copper-free GHK research includes a 2012 stem-cell-recovery skin study (PMID 23019153), gene-expression work relevant to nervous-system function and cognitive decline (PMID 28212278), a 2015 review of GHK's role in skin-regeneration cellular pathways (PMID 26236730), and a 2025 review of topical anti-wrinkle use (PMID 39963574). This is topical and cell-culture evidence; it does not establish injectable or systemic benefit. The larger GHK-Cu wound-healing/collagen literature does not automatically transfer to copper-free GHK, and copper-delivery-related claims do not apply to copper-free material without demonstrated copper-complexing in the specific product used.
Evidence Claims
Individual scientific statements drawn from the sources cited below, each shown with the specific evidence boundary that statement does not establish.
Supported
Copper-free GHK (glycyl-L-histidyl-L-lysine without a complexed copper ion) is chemically distinct from GHK-Cu, the copper(II)-complexed form; the two must not be merged as one compound.
Does not establish
Evidence boundary: Copper-delivery-related claims do not apply to copper-free material without demonstrated copper-complexing in the specific product used.
Supported
Direct copper-free GHK evidence is topical and cell-culture in nature and does not establish injectable or systemic benefit.
Safety & Evidence Limitations
Considerations reported in the sources cited on this page — not a complete list of every possible risk, and not medical advice.
Research Areas Being Studied
Research areas discussed on this page reflect the Repair / Tissue Healing category and the sources cited below.
Findings Reported in Studies
Educational summary only — reported in cited studies, not a claim of proven benefit.
No Human Study Findings Listed Yet
See preclinical, regulatory, and review sources below.
Study Tables by Evidence Type
No Sources Listed Yet
Human, preclinical, regulatory, and review sources will appear here as they are added.
Anecdotal Reported Patterns — Not Medical Advice
Anecdotal Reported Patterns — Not Medical Advice
Reported dosing patterns are included for educational context only. They are self-reported, unverified, not medical advice, and not instructions for human use. Community-submitted patterns are not yet available in this Phase 1 prototype; this section is a placeholder reserved for moderated, aggregated community data.
Lab Markers to Discuss With a Clinician
Educational topics only — not self-monitoring instructions.
FAQ
Disclaimer
Educational use only. This content is provided for informational and research-summary purposes only. It is not medical advice, not a treatment recommendation, not a dosing guide, and not a substitute for care from a licensed medical professional. Nothing here is intended to diagnose, treat, cure, prevent, or mitigate disease. Reported dosing patterns, when shown elsewhere on the site, must be labeled either as Study / Trial Dosing or Anecdotal Reported Patterns — Not Medical Advice. Community reports are self-reported, unverified, and not scientific proof.
Community-reported experiences, once enabled, must be displayed only as moderated, anonymized, or aggregated data. They are anecdotal, self-reported, unverified, and should never be presented as proof of safety, efficacy, or expected results.
Content status: Published. Last updated .
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