What Types of Cosmetic Peptides Are There?—Understanding Modern Cosmetic Peptides Through Their Mechanisms of Action

Cosmetic peptides are among the most important active ingredients in modern efficacy-driven skin care products. With the development of peptide synthesis technology, cosmetic peptides have been widely used in multiple areas, including wrinkle reduction, firming, repair, brightening, soothing, and scalp care. Although the number of cosmetic peptide types continues to increase, their mechanisms of action can be summarized into several major categories. Different types of cosmetic peptides act on different biological processes in the skin and are therefore suitable for different product development directions.

Signal Peptides

Signal peptides primarily work by mimicking the body’s natural signaling molecules, promoting fibroblasts to produce collagen, elastin, and extracellular matrix, thereby improving skin elasticity and reducing wrinkles. They are currently one of the most widely used classes of cosmetic peptides. These peptides are generally suitable for long-term anti-aging products. Their function is to promote the skin’s own repair processes rather than immediately altering facial muscle activity. Typical products include Palmitoyl Pentapeptide-4 (Matrixyl), Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, and Palmitoyl Tripeptide-5.

Among them, Palmitoyl Tripeptide-1 and Palmitoyl Tetrapeptide-7 are often combined into a composite system, providing both collagen synthesis promotion and improvement of inflammatory responses, and have therefore become a classic combination in high-end anti-aging products.

Neurotransmitter-Modulating Peptides

Neurotransmitter-modulating peptides primarily act on the process of information transmission between nerves and muscles, reducing dynamic wrinkles formed by continuous contraction of facial expression muscles; for this reason, they are also known as “botulinum-like peptides.” This type of cosmetic peptide does not block nerve function in the way botulinum toxin does. Instead, it regulates neural signals so that muscles remain in a more relaxed state, thereby improving fine lines and expression lines. Representative products include Acetyl Hexapeptide-8 (Argireline), Pentapeptide-18 (Leuphasyl), and Dipeptide Diaminobutyroyl Benzylamide Diacetate (Syn®-Ake).

In recent years, conopeptides have become an important research focus in this direction. Natural conotoxins are derived from marine cone snails and have highly selective neuromodulatory activity on ion channels. By structurally optimizing natural conotoxins, researchers have developed conopeptide analogs suitable for the cosmetics field, enabling them to regulate neural signal transmission and thereby improve dynamic wrinkles. Because conopeptides typically have complex disulfide-bond structures and stable spatial conformations, they place higher demands on peptide synthesis, oxidative folding, and purification processes. With the development of synthesis technologies, conopeptides have become one of the important development directions for high-end anti-wrinkle cosmetic peptides.

Carrier Peptides

Carrier peptides can bind metal ions or other active factors and transport them to target tissues, thereby promoting skin repair and tissue regeneration. The most widely used representative product at present is GHK-Cu (copper peptide). GHK is a naturally occurring tripeptide in the human body. When it binds with copper ions to form GHK-Cu, it can promote collagen production, stimulate tissue repair, and participate in biological processes such as wound healing. It is therefore widely used in repair-oriented skin care products. GHK-Cu is also one of the most extensively studied cosmetic peptides, with some of the richest clinical and literature data available, and is commonly used in anti-aging serums, repair-type skin care products, post-procedure care in aesthetic medicine, as well as scalp care and hair growth products.

In addition to copper peptides, in recent years researchers have also attempted to use carrier peptide systems involving other metal ions or active molecules in order to further expand the application scope of cosmetic peptides.

Enzyme-Inhibitory Peptides

Enzyme-inhibitory peptides primarily work by regulating the activity of relevant enzymes in the skin, slowing collagen degradation or reducing melanin production, thereby achieving anti-aging, brightening, or skin condition-improving effects. This class of cosmetic peptides has developed rapidly in recent years, and an increasing number of novel sequences are being continuously discovered through rational design and high-throughput screening.

Repair Peptides and Soothing Peptides (Repair Peptides)

Repair peptides are primarily used to promote skin barrier repair, reduce inflammatory responses, and improve skin tolerance. They are therefore widely applied in sensitive-skin care and post-procedure repair products in aesthetic medicine. In recent years, with the development of skin barrier theory, the importance of this class of cosmetic peptides has continued to increase, and they have gradually become an important component of high-end repair products.

Development Trends in Cosmetic Peptides

The development of cosmetic peptides is gradually shifting from natural sequences to artificially designed sequences. AI-assisted peptide design, non-natural amino acid modification, cyclic peptide design, and structural optimization technologies enable cosmetic peptides not only to achieve higher stability and activity, but also to be precisely designed for different targets. In the future, highly selective neuromodulatory peptides, conopeptide analogs, novel carrier peptides, and AI-designed cosmetic peptides will become important directions in the research and development of high-end skin care products.

Conclusion

Modern cosmetic peptides have formed multiple functional categories, including signal peptides, neurotransmitter-modulating peptides, carrier peptides, enzyme-inhibitory peptides, and repair peptides. Different types of cosmetic peptides improve skin condition through different biological mechanisms, providing a rich source of active ingredients for modern efficacy-driven skin care products. As peptide design technologies and synthesis processes continue to advance, cosmetic peptides will play an increasingly important role in precision skin care, anti-aging, and the development of innovative cosmetics.