Healing & RecoveryResearch profile

GHK

Glycyl-L-histidyl-L-lysine · Gly-His-Lys · GHK (copper-free) · Tripeptide-1

Think of it as a gentle nudge for your skin's repair system.

GHK is a tiny protein fragment that naturally occurs in your body but tends to decline as you age. Picture it as a subtle whisper to your skin and tissues, encouraging them to keep up with their maintenance work. While it forms a powerful duo with copper to boost healing and rejuvenation, even on its own, GHK can still lend a helping hand by gently influencing collagen production.

Without copper, GHK's effects are more understated, like a soft background music rather than a full-blown orchestra. It's often used in research as a baseline to understand just how much copper adds to the mix. Even so, this little peptide can still play a role in keeping your skin and tissues in line, albeit in a quieter way.

Who it's for

People curious about gentle skin and tissue support
Those interested in anti-aging solutions without the big guns
Individuals exploring natural compounds for skin care

Probably not for you if…

Anyone looking for dramatic, overnight results
People expecting a copper-like impact without the copper
Those who prefer one-stop, all-in-one solutions

Editorial summary for research context · Not medical advice

Mechanism of Action

GHK is a naturally-occurring human tripeptide (Gly-His-Lys) present in plasma, saliva, and urine, with levels that decline substantially with age. GHK has a high intrinsic affinity for copper(II) and forms the GHK-Cu complex, which is the form responsible for the majority of the regenerative and gene-modulating activities described in the literature. GHK in its copper-free (basic) form is often used as a research baseline or comparator to GHK-Cu; on its own it has more modest activity and is studied to isolate the contribution of the copper ion. Research suggests even copper-free GHK can influence collagen-metabolism gene expression, but most skin, hair, and wound-healing endpoints are dominated by the GHK-Cu complex.

Researched Benefits

Collagen-gene modulation (research baseline)

Gene-expression studies suggest GHK influences collagen- and extracellular-matrix-related transcripts, though effects are consistently smaller than those observed with GHK-Cu.

[Pickart & Margolina 2018]

Copper-binding research

In-vitro work characterizes the GHK-Cu(II) binding stoichiometry and stability constants that underlie the pharmacology of the copper-bound form.

[Pickart et al. 2015]

Antioxidant activity (modest)

Cell-based assays indicate modest free-radical-scavenging activity, enhanced substantially upon copper binding.

Research Protocols

The following dosing ranges have appeared in published research protocols. Presented for informational purposes only — not a recommendation for human use.

Research baseline (cosmetic comparator)

Dosage: 2 mg
Frequency: daily
Timing: evening
Cycle: 8 weeks

Used primarily as a comparator alongside GHK-Cu in research contexts to isolate copper-dependent vs copper-independent effects. In most practical research settings, GHK-Cu is preferred.

Topical research

Dosage: 3 mg
Frequency: twice daily
Timing: morning and evening
Cycle: 12 weeks

Compounded topical formulations have been used in cosmetic research. Effect size is typically smaller than matched GHK-Cu formulations.

Reported Side Effects

Generally well tolerated in preclinical and cosmetic research
Mild localized erythema with topical application
Rare injection-site reactions
Without bound copper, clinical effect is modest — research baseline rather than first-line

Contraindications

Pregnancy and lactation (no safety data)
Active malignancy (conservative precaution shared with GHK-Cu)
Known hypersensitivity to the peptide

Stacking Partners

Peptides commonly paired with GHK in published research and protocol write-ups.

healing

Vendor Pricing

72
Limitless Biotech
Best $/mg
Size100mg
Total$78.99
/ mg$0.79/mg
In stock
View

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Gear + Companions

Reconstitution supplies and research-backed supplement companions for GHK. Editorial picks only — we earn a commission through Amazon on the click, no sponsorship.

Gear you'll need

· Reconstitution + storage essentials

Bacteriostatic Water 30mL (0.9% Benzyl Alcohol)
Empower Pharmacy / generic medical supply
Reconstitutes every lyophilized peptide. 28-day viability refrigerated.
View at Pantheon →
Insulin Syringes 31G × 5/16" × 0.5mL (100 count)
EasyTouch
31G × 0.5mL insulin syringes — the default size for sub-0.25mL peptide doses.
Buy on Amazon →
Alcohol Prep Pads (Sterile, 200 count)
Dynarex
Sterile 70% IPA prep pads — one per vial stopper + one per injection site.
Buy on Amazon →
1-Quart Sharps Disposal Container
BD / Becton Dickinson
FDA-cleared sharps container — pharmacies won't accept improvised disposal.
Buy on Amazon →

Stacks well with

· Supplement companions — independent evidence, not sponsored

Granactive Retinoid 2% Emulsion (30mL)
The Ordinary
Modern retinoid pairs safely with copper-peptide topicals on alternating evenings — tretinoin-grade collagen stimulation without the irritation profile.
Buy on Amazon →

As an Amazon Associate we earn from qualifying purchases · Disclosed per FTC guidelines

Research Papers

The human tripeptide GHK and tissue remodeling
Pickart L, Vasquez-Soltero JM, Margolina A · Journal of Aging Research · 2015
PubMed 26064676 →
Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data
Pickart L, Margolina A · International Journal of Molecular Sciences · 2018
PubMed 29986520 →

GHK

Mechanism of Action

Researched Benefits