Peptides in cosmetics: what do they really do?

Peptides have become staples of anti-aging skincare, listed on many product labels as cutting-edge active ingredients. But behind this somewhat technical term, it’s not always easy to know exactly what they are or what these molecules actually do for the skin.

Peptides act as biological messengers capable of regulating certain skin functions, including the production of structural proteins. Here's what you need to understand to get a clear picture—without overpromising.

What is a peptide?

A peptide is a short chain of amino acids, the basic building blocks of proteins. Collagen and elastin, which serve as the skin’s structural support, are proteins. The peptides used in cosmetics are small in size, which allows them to interact with skin cells and act as signaling molecules.

In other words, rather than acting directly, peptides function as messengers: they transmit instructions to cells that can reactivate or modulate certain natural mechanisms in the skin.

How do peptides affect the skin?

The scientific literature classifies cosmetic peptides into several major groups based on their mechanism of action. This diversity explains why they do not all serve the same purpose.

Signal peptides, also known as matrikines, stimulate the production of extracellular matrix components, such as collagen and elastin, which helps improve the skin’s firmness and elasticity. Neurotransmitter-inhibiting peptides, of which acetyl hexapeptide-8 is a well-known example, are designed to reduce the appearance of expression lines by modulating surface muscle contraction. Carrier peptides, such as the copper-GHK complex, transport trace elements that aid in repair. Finally, enzyme-inhibiting peptides limit the breakdown of structural proteins.

What can we really expect from peptides?

The available clinical data show real but generally moderate results: over treatment periods of a few weeks, several peptides have been shown to reduce wrinkle depth and improve skin firmness and elasticity. Peptides are therefore promising active ingredients that should be viewed as part of a consistent skincare routine rather than as miracle solutions.

Their main limitation is technical in nature: because they are often hydrophilic and relatively large in size, some peptides have difficulty penetrating the stratum corneum. Their effectiveness therefore depends heavily on the formulation and how the peptide is combined with other active ingredients. Here, too, consistent application remains crucial.

Peptides in PERS Skincare

At PERS, peptides are used in synergy with other repairing active ingredients. The PERS Rich Cream combines a peptide (acetyl hexapeptide-8) with allantoin and panthenol to promote skin regeneration, support collagen and elastin production, and provide firmness and comfort. The PERS Eye Cream uses this same peptide, combined with hyaluronic acid and arnica, to revitalize the eye area.

The PERS Healthy Glow Balm, meanwhile, contains a peptide (palmitoyl tetrapeptide-10) combined with vitamin C and caffeine to revitalize the complexion and enhance radiance. In each case, the peptide does not act alone: it is the carefully considered combination of complementary active ingredients that makes the formula so effective.

Key Takeaways

Peptides are short chains of amino acids that act as messengers on the skin’s surface. Depending on their type, they can stimulate structural proteins, reduce the appearance of expression lines, or deliver trace elements. The results—which are real but gradual—depend heavily on the formulation and consistency of use. When incorporated into a consistent skincare routine and combined with other active ingredients, peptides are a valuable asset for firmer, visibly more rested skin.

Scientific Sources