Peptides in Skincare: Science-Backed Effective Types
What Are Peptides?
Short chains of amino acids (2-50 units). They act as signaling molecules telling skin cells to produce collagen, relax muscle contractions, or strengthen the barrier.
The 4 Categories
1. Signal Peptides (Most Common)
Tell fibroblasts to produce collagen. Matrixyl (Palmitoyl Pentapeptide-4) showed 19 percent wrinkle reduction at 4 months. Strong evidence.
2. Carrier Peptides
Deliver trace minerals like copper. GHK-Cu promotes wound healing and collagen synthesis. Moderate evidence but can be irritating at effective concentrations.
3. Neurotransmitter Inhibitors
Reduce muscle contractions (Botox-like). Argireline achieves 10-15 percent expression line reduction topically. Weak-to-moderate evidence.
4. Enzyme Inhibitors
Block collagen-breaking enzymes. Soy, rice, silk peptides. Emerging evidence with limited human trials.
How to Choose
Look for specific peptide names, not just peptide complex. Should appear before phenoxyethanol. Opaque airless packaging prevents degradation.
Top Recommendations
Best overall: The Ordinary Buffet + Copper Peptides. Best anti-aging: Paula's Choice Peptide Booster (8 peptides). Best budget: Good Molecules Peptide Serum.
Peptides + Retinol
Synergistic: retinol stimulates collagen while peptides signal for more and protect existing. Use peptides AM, retinol PM, or layer peptides first at night.
