Ingredient or product comparison
AHK-Cu Gene Expression: Compound Comparison
GHK-Cu (AHK-Cu) MTF-1, TGF-β signaling Activates metal-responsive transcription factors; suppresses Smad2/3 phosphorylation 60–70% increase in COL1A1/COL1A2 Strong (MMP-1, MMP-3, MMP-9 reduced 30–50%) Absolute. Copper ion required for activity Gold standard fo
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- GHK-Cu (AHK-Cu)
- MTF-1, TGF-β signaling
- Activates metal-responsive transcription factors; suppresses Smad2/3 phosphorylation
- 60–70% increase in COL1A1/COL1A2
- Strong (MMP-1, MMP-3, MMP-9 reduced 30–50%)
- Absolute. Copper ion required for activity
- Gold standard for multi-pathway gene modulation. No synthetic retinoid matches its breadth.
- Tretinoin (Retin-A)
- Retinoic acid receptors (RAR/RXR)
- Binds nuclear receptors to upregulate collagen synthesis genes
- 40–50% increase in procollagen I
- Minimal to none
- None
- Effective collagen stimulator but doesn't suppress MMPs. Net collagen gain lower than GHK-Cu.
- Matrixyl (Palmitoyl Pentapeptide-4)
- TGF-β pathway
- Increases TGF-β receptor expression
- 18–25% increase in procollagen I
- Weak (inconsistent data)
- Modest collagen boost with minimal side effects, but lacks antioxidant and anti-inflammatory gene effects.
- Ascorbic Acid (Vitamin C)
- Prolyl hydroxylase cofactor
- Required for collagen post-translational modification (not transcription)
- Indirect. Enables collagen stability, not synthesis
- Essential for collagen maturation but doesn't upregulate collagen genes. Works synergistically with GHK-Cu.
- Copper-Free GHK (Apo-GHK)
- None (no transcriptional activity)
- No nuclear receptor binding
- 0%. No gene-level changes observed
- N/A. Lacks copper
- Biologically inert for gene expression. Marketing as 'copper peptide' without copper is misleading.