GHK-Cu (Copper Peptide) Testing

Mechanism of action

GHK-Cu is a copper-binding tripeptide naturally found in plasma at concentrations that decline with age. The copper-peptide complex modulates expression of >4,000 genes including those for collagen synthesis, antioxidant defenses, and tissue remodeling. Topical and injectable research use is extensive.

Sequence & structure

Activity depends entirely on the 1:1 copper:peptide complex. Free peptide alone is essentially inert; excess free copper is cytotoxic. This stoichiometric ratio is the #1 QC parameter — and the most commonly mishandled.

Research areas

• ●Skin remodeling and anti-aging
• ●Wound healing
• ●Hair regrowth (Phase 2 trials)
• ●Anti-inflammatory and antioxidant

Dosing in the literature

Topical: 1–3 mg/mL formulations widely studied. Injectable research: typically 1–3 mg SC. Hair growth studies use scalp injections at 1–2 mg.

For research/informational purposes only — not medical advice.

What we test on GHK-Cu (Copper Peptide)

RP-HPLC peptide purity, ICP-MS copper quantitation, calculation and reporting of Cu:peptide molar ratio (target 0.95–1.05). For injectable lots, endotoxin and sterility.

Common impurities & failure modes

• Incorrect Cu:peptide ratio

  We see vials with Cu:peptide ratios from 0.3:1 to 3:1, all sold as 'GHK-Cu'. ICP-MS quantifies copper precisely; HPLC quantifies peptide; we report the ratio.

• Free copper (CuCl₂ or CuSO₄)

  Unbound copper is cytotoxic and pro-oxidant — the opposite of the intended effect.

• Wrong peptide

  Vials labeled GHK-Cu that test as plain GHK (no copper) or as a related copper-binding tripeptide.

• Oxidized histidine

  Minor peak; rarely significant.

Storage & stability

Powder stable at room temperature in a dark, sealed container.

Frequently asked questions