Ingredient or product comparison
GHK-Cu Cosmetic Actually Do: Effectiveness Comparison
GHK-Cu (0.5–3%) Copper ion delivery → TGF-beta activation, MMP modulation, anti-inflammatory signaling 70–120% increase in Type I/III collagen synthesis (in vitro); 18% skin density increase (12-week clinical) Minimal. <5% report sensitivity 6–8 weeks for text
This source-based comparison does not add ratings or recommend a winner.
- GHK-Cu (0.5–3%)
- Copper ion delivery → TGF-beta activation, MMP modulation, anti-inflammatory signaling
- 70–120% increase in Type I/III collagen synthesis (in vitro); 18% skin density increase (12-week clinical)
- Minimal. <5% report sensitivity
- 6–8 weeks for texture, 10–12 weeks for firmness
- Direct intracellular copper chelation
- Tretinoin (0.025–0.1%)
- Retinoic acid receptor activation → gene transcription for collagen, increased cell turnover
- 80% increase in Type I procollagen (6-month clinical)
- High. 30–50% experience peeling, redness, photosensitivity
- 12–16 weeks, worsens before improvement
- None
- Vitamin C (L-Ascorbic Acid 10–20%)
- Cofactor for prolyl hydroxylase (collagen cross-linking enzyme), antioxidant
- 30–50% increase in collagen synthesis (in vitro); limited clinical density data
- Moderate. PH-dependent irritation, oxidation instability
- 8–12 weeks
- Indirect. Supports copper-dependent enzymes but doesn't deliver copper
- Matrixyl (Palmitoyl Pentapeptide) 3–5%
- Peptide signaling to stimulate collagen/GAG production
- 35% increase in Type I collagen (manufacturer data, limited independent replication)
- Minimal
- Copper Gluconate (Topical Copper Salt)
- Ionic copper absorption
- Minimal. Poor penetration due to charge repulsion
- Minimal to none
- No measurable collagen effect in clinical trials
- Surface only. Negligible intracellular delivery