Healing & Recovery / Skin
GHK-Cu
Copper Peptide · Glycyl-L-histidyl-L-lysine + Cu²⁺
What it is
GHK is a tiny tripeptide (just three amino acids: glycine, histidine, lysine) that occurs naturally in your bloodstream. It binds tightly to copper ions, forming the GHK-Cu complex. Levels in plasma drop sharply with age — from about 200 ng/mL in your 20s to about 80 ng/mL in your 60s. GHK-Cu is widely used both as an injectable peptide and as an active ingredient in high-end skincare.
How it works
GHK-Cu is a repair and remodeling signal. It does several things at once:
- Modulates over 4,000 genes — flips them toward "repair and regeneration" patterns characteristic of younger tissue.
- Stimulates collagen, elastin, and glycosaminoglycan production — the structural proteins of skin, tendons, and connective tissue.
- Activates skin stem cells via p63 and integrin upregulation.
- Has antioxidant and anti-inflammatory effects — quenches reactive oxygen species and reduces TNF-α.
- Promotes hair follicle activity — some evidence for hair regrowth.
Benefits
- Visible reduction in fine lines, wrinkles, and skin laxity (clinical study showed improvements after 12 weeks)
- Increased collagen production (~70% of treated subjects showed increases)
- Faster wound and scar healing
- Tendon and soft tissue support
- Hair follicle stimulation and reduced hair loss
- Improved skin firmness, tone, and clarity
- Antioxidant and anti-inflammatory effects throughout the body
Timeline
- Week 1–2
- Better skin hydration and texture — subtle but noticeable.
- Week 4
- Improved skin tone and reduction in redness/inflammation.
- Week 8–12
- Visible firmness improvement; reduction in fine lines (clinical study endpoint).
- Week 12–24
- Peak collagen remodeling effects; tendon/joint support if injected.
Dosing & titration
SubQ starting dose1–2 mg, 2–3x per week (NOT daily)
Standard range1–3 mg per week total — lower than most internet protocols
Topical0.05–2% concentration in serum form, applied PM
TimingEvening dosing aligns with natural collagen synthesis window
Cofactors neededAdequate dietary zinc (15–30 mg/day) to balance copper. Vitamin C oral (NOT topical with GHK-Cu — deactivates it). Hydrolyzed collagen for raw materials.
When to titrate upAlmost never — higher doses commonly cause skin to look worse ("copper uglies") from zinc depletion. Many users see best results at the lower end.
Side effects & risks
- The "copper uglies" — dry, dull, accelerated-aged skin appearance from chronic zinc-copper imbalance at high doses
- Injection site irritation
- Headache or fatigue if zinc levels crash
- Mild metallic taste (rare)
Common mistakes: Don't dose 2 mg/day — this is the typical online recommendation and it's too high for most. Don't use topical vitamin C alongside topical GHK-Cu. Don't combine with iron supplementation (competes for the same receptors). Avoid mixed "glow blends" — pH and degradation usually inactivate them.
Typical price
$80–$150/mo
50–100 mg vial from a 503A compounding pharmacy. Topical serums (legal cosmetic use) range $30–$150 per bottle.
Studies
- GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration — Comprehensive review of mechanisms across 4,000+ genes regulated by GHK-Cu. PubMed Central BioMed Research International, 2015
- Regenerative and Protective Actions of the GHK-Cu Peptide — Detailed mechanism review covering wound healing, anti-inflammatory, and stem cell effects. PubMed Central International Journal of Molecular Sciences, 2018
- The Human Tripeptide GHK-Cu in Prevention of Oxidative Stress and Degenerative Conditions of Aging — Cognitive and longevity implications. PubMed Central Oxidative Medicine and Cellular Longevity, 2012
- Effects of Topical Copper Tripeptide Complex on CO₂ Laser-Resurfaced Skin — Clinical evidence of accelerated post-procedure healing. Archives of Facial Plastic Surgery Archives of Facial Plastic Surgery, 2006
- Using Copper to Improve the Well-Being of the Skin — Reviews mechanisms behind GHK-Cu skin benefits. PubMed Central Current Chemical Biology, 2015
Educational reference only. Not medical advice. GHK-Cu is not FDA-approved as an injectable drug; topical cosmetic use is permissible. Any injectable use should be supervised by a licensed prescriber.