Peptide Skincare & BeautySkin science and ingredient guides

Ingredient or product comparison

GHK-Cu Cosmetic Reddit Reviews Community Comparison

Commercial serum (0.5% GHK-Cu, pre-mixed) 15–25% (user photos, calipers) 180+ (manufacturer sealed) Insufficient concentration. Clinical threshold is 2% minimum Convenient but underdosed; results plateau early DIY from lyophilized powder (2–3% in bacteriostati

This source-based comparison does not add ratings or recommend a winner.

  • Commercial serum (0.5% GHK-Cu, pre-mixed)
  • 15–25% (user photos, calipers)
  • 180+ (manufacturer sealed)
  • Insufficient concentration. Clinical threshold is 2% minimum
  • Convenient but underdosed; results plateau early
  • DIY from lyophilized powder (2–3% in bacteriostatic water)
  • 60–70% (user photos, clinical-grade calipers)
  • 21–28 (refrigerated, sealed aliquots)
  • Reconstitution errors, copper ratio mistakes
  • Matches clinical trial efficacy when prepared correctly
  • DIY from powder (distilled water only)
  • 40–50% (user photos)
  • 7–10 (refrigerated)
  • Short shelf life, no antimicrobial preservative
  • Works but requires fresh batches weekly
  • Pre-mixed high-concentration serum (2%+, commercial)
  • 50–60% (user photos)
  • 90–120 (unopened)
  • Expensive; degrades rapidly after opening
  • Best option for users who won't prepare solutions
  • Frozen batches (user attempt at long-term storage)
  • 10–20% (significantly reduced)
  • N/A (freezing destroys peptide structure)
  • Ice crystal formation breaks copper-peptide bond
  • Never freeze GHK-Cu. Refrigerate only