Copper Peptides (GHK-Cu)vsZinc Oxide

GHK-Cu activates wound repair genes through copper-dependent transcription factor modulation. It stimulates fibroblasts to produce collagen types I, III, and V via COL1A1, COL3A1, COL5A1 upregulation, plus elastin, decorin, and glycosaminoglycans. Copper serves as cofactor for lysyl oxidase (collagen cross-linking). It attracts macrophages and mast cells releasing PDGF, TGF-beta, FGF. Promotes angiogenesis via VEGF. Uniquely activates MMP-2 and MMP-9 to break down damaged collagen and scar tissue — supporting healthy remodeling. Balanced anabolic-catabolic activity explains efficacy in anti-aging and scar revision. Avoid with vitamin C: copper catalyzes Fenton reactions oxidizing ascorbic acid.

Zinc oxide particles sit on the skin surface and primarily scatter and reflect UV radiation across the full UVA (320–400 nm) and UVB (280–320 nm) spectrum via Rayleigh and Mie scattering. At nano scale, zinc oxide also absorbs UV photons and undergoes semiconductor band-gap excitation, converting UV energy to heat—a mechanism similar to organic chemical filters. It provides the broadest single-ingredient UV coverage available. Beyond photoprotection, zinc oxide exerts anti-inflammatory effects by inhibiting NF-κB activation, reducing pro-inflammatory cytokine release (TNF-α, IL-6), and modulating Toll-like receptor signaling. It supports barrier repair by promoting occludin and zonula occludens-1 expression in tight junctions. Zinc ions have mild antimicrobial activity against Staphylococcus aureus and Candida species. These properties underlie its use in diaper rash creams, wound care, and post-procedure skincare. Zinc oxide does not penetrate intact stratum corneum when formulated as micronized or nano particles.