Ingredient or product comparison
Abdulghani et al. (1998) — the gold-standard comparison
A 12-week randomized trial enrolled 67 women with moderate-to-severe facial aging and compared four topical formulations: a copper peptide cream, a vitamin C cream, a melatonin cream, and tretinoin. Skin biopsies and clinical photography were evaluated at week
This source-based comparison does not add ratings or recommend a winner.
- A 12-week randomized trial enrolled 67 women with moderate-to-severe facial aging and compared four topical formulations: a copper peptide cream, a vitamin C cream, a melatonin cream, and tretinoin. Skin biopsies and clinical photography were evaluated at weeks 4, 8, and 12. The copper peptide group showed statistically significant improvements in skin density (ultrasound), collagen content (histology), and visual wrinkle depth — outcomes that exceeded both the vitamin C and tretinoin groups by week 12. This remains the most-cited clinical comparison for topical copper peptide efficacy. PubMed indexes the broader GHK-Cu topical serum research across subsequent replication studies.