Quick Comparison
| Copper Peptides (GHK-Cu) | Madecassoside | |
|---|---|---|
| Typical Concentration | Concentrations: 0.1-1% in skincare products. Apply once or twice daily. Do NOT use with strong acids (vitamin C at low pH, AHAs) — copper can catalyze free radical formation with ascorbic acid. Best used as a standalone PM treatment or mixed with peptide serums. | Concentrations: 0.01-1% as an isolated compound. Products with pure madecassoside are common in K-beauty and French pharmacy brands (La Roche-Posay Cicaplast). Apply morning and night. Excellent as a recovery treatment post-retinoid or post-procedure. |
| Application | Topical (serum, cream). Blue/copper-colored products. Do not combine with low-pH vitamin C. | Topical (serum, cream, balm). Apply to clean skin. Compatible with all active ingredients. |
| Research Papers | 10 papers | 10 papers |
| Categories |
Mechanism of Action
Copper Peptides (GHK-Cu)
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.
Madecassoside
Madecassoside (triterpene glycoside from Centella asiatica) inhibits NF-kappa B nuclear translocation by preventing I-kappa B alpha degradation, suppressing transcription of pro-inflammatory cytokines (TNF-alpha, IL-1beta, IL-6) and COX-2. Activates Nrf2, upregulating antioxidant enzymes (heme oxygenase-1, NQO1, glutathione peroxidase). Stimulates collagen type I synthesis through TGF-beta/Smad3 signaling in fibroblasts, upregulating COL1A1. Promotes keratinocyte migration (wound closure) by enhancing integrin expression and matrix metalloproteinase activity. Inhibits hyaluronidase, preserving skin hyaluronic acid. Reduces VEGF expression, inhibits MMP-1. Comprehensive: anti-inflammatory, antioxidant, pro-collagen, wound-healing. Used in pharmaceutical wound care (Madecassol) and K-beauty. Ideal for post-procedure recovery, retinoid irritation, sensitive skin.
Risks & Safety
Copper Peptides (GHK-Cu)
Common
Blue/green tint to product (normal — copper color). Mild irritation.
Serious
Can be pro-oxidant when combined with vitamin C — avoid concurrent use.
Rare
Allergic reaction to copper.
Madecassoside
Common
Essentially none — extremely well-tolerated.
Serious
None documented.
Rare
Very rare allergic reaction.
Full Profiles
Copper Peptides (GHK-Cu) →
GHK-Cu is a naturally occurring copper complex that declines with age (60% reduction by age 60). It is one of the most potent wound-healing and skin-remodeling signals known — it stimulates collagen, elastin, glycosaminoglycan synthesis, and new blood vessel growth while simultaneously breaking down excess scar tissue. Used in both anti-aging and post-procedure recovery.
Madecassoside →
A purified triterpene glycoside from Centella asiatica that is the primary anti-inflammatory and wound-healing compound in the 'cica' family. While Centella asiatica extracts contain a mix of four triterpenes, isolated madecassoside provides the most potent soothing and barrier-repair effects. It is particularly effective for post-procedure recovery, sensitive skin, and skin exposed to environmental stressors like pollution and UV.