Peptides are short chains of amino acids, the same building blocks that make up proteins. A protein can be hundreds of amino acids long. A cosmetic peptide is usually between two and about a dozen. That small size is the point: short, well-defined sequences can be made synthetically, purified, and added to a formula in a controlled way.
The four main types
A widely cited review in the International Journal of Cosmetic Science grouped topical peptides into four categories: signal peptides, enzyme-inhibitor peptides, neurotransmitter-inhibitor peptides, and carrier peptides (Gorouhi and Maibach, 2009).
Signal peptides are sequences modeled on fragments of skin proteins. They are the most common type in anti-aging serums.
Carrier peptides are paired with a trace element, such as copper, to help bring it into a formula in a stable form.
Neurotransmitter-inhibitor peptides are the type often marketed for expression lines.
Enzyme-inhibitor peptides are designed around enzymes that break down skin proteins.
What the research shows
The evidence is promising but still developing. The Linus Pauling Institute summarizes several placebo-controlled studies in which topical peptides improved measures such as fine lines, roughness, and elasticity, and notes that longer clinical trials are still needed (Linus Pauling Institute). A 2026 systematic review and meta-analysis found modest but significant improvements in hydration and brightness. It also noted that only two high-quality topical peptide studies met its criteria (Frontiers in Medicine, 2026).
Our read: peptides are among the better-studied cosmetic ingredients, but results depend on the specific peptide, the full formula, and consistent use. A long list of peptides on a label does not by itself mean a better product.
How we use peptides
One Matrix New York formulas are built around a focused peptide complex rather than the longest possible ingredient list. We keep a peptide only when it has a clear reason to be in the formula and its supplier documentation checks out.
How to read peptide claims
Cosmetics are allowed to change how skin looks and feels. Products that claim to treat a condition or change how the body works are regulated as drugs (U.S. FDA). When a peptide serum promises to "rebuild," "repair," or "regenerate" skin, it is making a claim the product category can't support. Look for appearance language instead: smoother-looking, firmer-looking, more hydrated.
This article is for general education and is not medical advice.
