What Are Copper Peptides and Do They Actually Work?

Copper peptides show up in a lot of serums lately, but the science behind them is older and more established than the recent surge in popularity suggests. Here's what they actually are, and what the research supports.

What copper peptides are

Copper peptides are small protein fragments bound to copper ions. They occur naturally in the body and play a role in tissue repair and maintenance. In skincare, they're formulated to signal fibroblasts, the cells responsible for producing collagen and elastin, which is the basis for most of their claimed benefits.

What the research actually supports

Studied benefits of copper peptides include support for collagen and elastin production, improved skin elasticity and thickness, antioxidant activity, and support for the skin's natural repair processes. They're also commonly used in professional settings alongside treatments like microneedling, where deeper delivery can enhance their effect.

What they won't do

Copper peptides are a supportive, cumulative ingredient, not a fast fix. Visible improvements in fine lines and texture typically build over several weeks of consistent use, not days. They also aren't a replacement for sun protection or a complete skincare routine, they're one well-supported ingredient within one.

How to use one correctly

Apply to clean, dry skin, and layer before heavier creams or oils so the serum can absorb fully. Copper peptides pair well with hydrating ingredients like hyaluronic acid, but should generally be kept separate from direct-acid exfoliants and used on alternating days from retinol to avoid irritation.

Where it fits with red light therapy

Copper peptides are increasingly used as a pre-treatment step before red light therapy, since well-hydrated, primed skin can make better use of a light therapy session. That's the reasoning behind pairing a copper peptide serum like PRE-LIGHT with red light treatment, rather than treating them as unrelated steps.