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Not all peptides are the same. There are actually three levels, and once you know what to look for, they're easy to tell apart. Good. Basic peptide serum. These usually use one peptide for one main job, like supporting collagen or softening the look of fine lines. Simple, but good place to start. Better. Multi-peptide serum. These combine several peptides in one formula, so they can support more than one concern at a time. Look for three or more peptide names on the label. More comprehensive than a basic peptide serum, but usually copper-free. Best. Copper peptide serum. The key ingredient is GHK-Cu, a copper-bound peptide that supports collagen, elastin, skin repair, and antioxidant defense. But copper peptides are harder to stabilize, so the full formula matters just as much as the ingredient name. Dr. Reju-All PDRN Copper Peptide Serum combines copper peptide with PDRN in visible blue capsules for a repair-focused formula. And this is my best pick.