GHK-Cu, or Glycyl-L-Histidyl-L-Lysine Copper, is a naturally occurring tripeptide complexed with copper ions (Cu²⁺). It’s found in human plasma, saliva, and urine, with levels declining with age (from ~200 ng/mL at age 20 to ~80 ng/mL by age 60). Discovered in 1973 by Dr. Loren Pickart, it’s widely used in cosmetics and researched for regenerative and anti-aging effects.

Chemical Structure

• Sequence: Gly-His-Lys (GHK) bound to Cu²⁺.
• Molecular formula: C₁₄H₂₄N₆O₄Cu.
• Key feature: The copper ion enhances bioavailability and bioactivity, allowing GHK-Cu to act as a signaling molecule.

Key Benefits and Research Evidence

GHK-Cu is popular in skincare (e.g., serums, creams) and has emerging therapeutic applications. Here’s a breakdown supported by studies:

Sources: Peer-reviewed papers in Journal of Investigative Dermatology, BioMed Research International, and Pickart’s reviews (e.g., 2015 in Oxidative Medicine). PubMed has 100+ studies; search “GHK-Cu” for latest.

Usage and Products

• Topical: 0.1-1% concentrations in serums (e.g., The Ordinary “Buffet + Copper Peptides,” NIOD Copper Amino Isolate). Apply 1-2x daily; blue color fades on skin.
• Injectable: Used in research/clinics (e.g., 1-2 mg subcutaneous doses for hair/wounds). Not FDA-approved for most uses—consult a doctor.
• DIY/Supplements: Available as powder (e.g., 100 mg vials). Reconstitute with bacteriostatic water; typical dose 1-5 mg/day subQ or topical.
• Stability: pH-sensitive (best 5-7); store cool/dark. Avoid mixing with strong acids/vitamin C (can displace Cu).

Safety and Side Effects

• Generally Safe: Low toxicity (LD50 >2g/kg in rats). Topical use rarely causes irritation.
• Risks:
  • Excess copper: Nausea, headaches (rare at cosmetic doses).
  • Allergic reactions: Histamine release possible.
  • Pregnancy/Breastfeeding: Avoid due to lack of data.
• Interactions: May enhance antibiotics; monitor copper levels if using long-term.
• Regulation: Cosmetic-grade OK; pharma-grade for injections. Not a drug—results vary.

Comparison to Similar Peptides

For best results, combine with sunscreen/moisturizers. Research is promising but ongoing—human trials are limited for non-cosmetic uses. If you’re using it therapeutically, get bloodwork for copper/zinc balance. Sources: Pickart’s site (copperpeptides.com), clinicaltrials.gov.

.