Protocols›Cognitive & neuro›Calm & Sleep
← Protocols
Skin · collagenSystemic · signallingCosmetic / research

GHK-Cu Skin & Systemic

Compound: GHK-Cu · the copper-tripeptide skin and tissue-signalling option
"The one here with real human data — but read the fine print. GHK-Cu’s evidence is strongest for topical skin use (wrinkles, elasticity, wound healing) in cosmetic trials. The injected, systemic ‘gene-reset’ longevity story is extrapolation from lab data, not human trials."
GoalSkin quality / tissue repair (topical); systemic signalling (experimental)
Compounds1 · GHK-Cu
Human evidenceModerate topical (cosmetic RCTs); weak for injected / systemic
StatusUK: not MHRA-licensed — a cosmetic ingredient / research-use compound, not an approved medicine. Not an FDA-approved drug.
In this stack — snapshot; tap through for the full molecule file
Provenance & evidence layers — of the combination, not the parts
What’s actually established (topical)
GHK-Cu (skin)
An endogenous copper tripeptide that declines with age. The strongest human evidence is topical: double-blind cosmetic RCTs (e.g. Watson 2009) show improvements in fine wrinkles, elasticity and photoaged skin; post-procedure trials show faster re-epithelialisation.
Basis of that data
Cosmetic-formulation trials on intact skin — real, but modest and topical.
Evidence it adds
Genuine human evidence — for topical cosmetic use.
Basis: double-blind cosmetic RCTs (topical)
The systemic claims
Gene-expression "reset"
Connectivity-Map analyses suggest GHK modulates a large fraction of human genes toward a "younger" profile — striking, but from cell and mechanistic data.
Injected / systemic longevity
There are no human trials of injected GHK-Cu for longevity or systemic repair; the "reset thousands of genes" framing is preclinical extrapolation with a real delivery problem.
Evidence it adds
None for systemic human use — mechanism, not proof.
Basis: preclinical / mechanistic — no systemic human trials
Grey-market / unsupervised use
Where / who
Sold both as topical cosmetic serums and as injectable research vials; the injectable systemic use is entirely community-driven.
What changes
Injected GHK-Cu can cause local irritation; identity, purity and dose in research vials are unverified, and copper load matters.
Evidence it adds
None — the cosmetic RCT evidence does not transfer to an injected vial.
Basis: real-world sourcing — not a trial tier
Regulatory — read carefully
MHRA (UK)
Not a licensed medicine; used as a cosmetic ingredient and sold as research-use. Not a controlled drug.
Elsewhere
Not FDA-approved as a drug; regulated as a cosmetic ingredient in skincare.
What it means
Solid as a topical skin active; the injected longevity story is unproven in humans.
Basis: MHRA: unlicensed medicine; cosmetic ingredient
Why it’s here

GHK-Cu is the outlier in this set — it has the most real human data, but almost all of it is topical. Cosmetic double-blind trials show measurable gains in wrinkles, elasticity and wound healing when it’s applied to skin. Where it gets oversold is the leap to injected, systemic use: the much-quoted "resets thousands of genes toward a younger profile" comes from Connectivity-Map and cell data, with a genuine delivery problem and no human systemic trials. Honest split: strong for topical skin, speculative injected.

Members only · the actionable depth
See exactly how it's run
Doses, titration structure and what to monitor are part of membership. The provenance, evidence and status above are always free.
Get the tracker · £4.99/mo →
£4.99/mo · cancel anytime
Cycle shape — how it's typically structured, not a schedule to follow
GHK-Cu (topical)
daily, cosmetic use
GHK-Cu (systemic)
SubQ, experimental
Review
reassess
The topical column reflects cosmetic-trial use; the systemic column is community practice with no trial basis. Copper load and injection-site irritation are the practical limits. Not a prescription.
What's worth monitoring

Topical GHK-Cu is well tolerated in cosmetic studies. The caveats sit with injected / systemic use: local irritation is common, cumulative copper matters, and there is no human trial evidence that systemic dosing does what the topical data shows. Product identity and purity in research vials are unverified. General information, not medical advice.

Evidence
GHK-Cu · topical skin Moderate

Double-blind cosmetic RCTs show wrinkle, elasticity and wound-healing benefits applied to skin.

GHK-Cu · systemic Weak

Gene-expression breadth is preclinical/mechanistic; no human trials of injected systemic use.

Unsupervised injectable use Risk shifts

Cosmetic evidence doesn’t transfer to a research vial; copper load and irritation apply.

The honest point

Real topical skin data; the injected longevity story is extrapolation. Split the two.

Fast facts
Compounds

GHK-Cu

Routes

Topical (evidenced) · subcutaneous (experimental)

UK strip

GREEN — legal to possess (unlicensed)