Understand the source comparison
Peptides for Stretch Marks: Formulation Comparison
Copper Tripeptide-1 (GHK-Cu) Stimulates lysyl oxidase, upregulates collagen I/III genes, inhibits MMPs 2–5% Liposomal or nanoparticle essential 18–27% reduction in depth/width after 12 weeks Most robust clinical evidence. But formulation stability and delivery
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- Copper Tripeptide-1 (GHK-Cu)
- Stimulates lysyl oxidase, upregulates collagen I/III genes, inhibits MMPs
- 2–5%
- Liposomal or nanoparticle essential
- 18–27% reduction in depth/width after 12 weeks
- Most robust clinical evidence. But formulation stability and delivery quality determine real-world efficacy
- Palmitoyl Pentapeptide-4 (Matrixyl)
- Mimics collagen fragments, triggers TGF-β upregulation and repair pathways
- 5–10%
- Liposomal preferred, stable in anhydrous serums
- 20–22% improvement in mature striae after 16 weeks
- Effective for striae albae (white marks) but requires high concentration. Most retail products underdose
- Acetyl Hexapeptide-8 (Argireline)
- Inhibits SNARE complex, reduces microcontractions during skin stretching
- 5%
- Standard emulsion acceptable for prevention
- 38% reduction in striae gravidarum incidence (preventive use)
- Evidence limited to pregnancy prevention. Not repair of existing marks
- Palmitoyl Tripeptide-1 + Tetrapeptide-7 (Syn-Coll)
- Dual action: stimulates collagen synthesis and reduces IL-6 inflammation
- 3–8% combined
- Requires penetration enhancer or occlusive layer
- 15–18% improvement in early striae (under 6 months old)
- Best results in striae rubrae (red phase) when inflammation is active