GHK is promising biology, not magic medicine., Most real human data is topical, not systemic., And there are people where caution matters:, Active or recent cancer, Copper imbalance or metabolism Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule Skin Restoration: Prioritizing Safety Over Trends Synergy of GHKCu and hyaluronic acid on collagen IV upregulation via fibroblast and exvivo skin tests Jiang 2023 Journal of Cosmetic Dermatology Wiley Online Library