Palmitoyl Peptides: Commonly used in antiaging products, these are amino acid chains bonded to a fatty acid, which helps them penetrate the skin’s outer barrier. Once absorbed, they can stimulate collagen production and strengthen the skin’s support structure, making them a popular antiaging tool. One well-known type, palmitoyl tripeptide-5, is designed to mimic the body’s natural signals for boosting collagen.
Copper Tripeptide-1 (GHK-Cu): Used in antiaging and wound healing products, this naturally occurring copper-binding peptide may help stimulate the growth of blood vessels and collagen production.
Acetyl Hexapeptide-8: Sometimes marketed as a “Botox-like” ingredient because it may soften expression lines, acetyl hexapeptide-8 is widely used in topical formulations for antiaging, scar management, and skin rejuvenation. It is a lab-made ingredient designed to imitate the natural peptides in the skin. It has emerged as a noninvasive alternative to actual Botox, but with comparatively lower efficacy.
Brightening Peptides: These peptides are typically used in cosmetic products targeting uneven skin tone and the appearance of dark spots, as they may reduce melanin production. One example is decapeptide-12, which may offer a better safety profile than hydroquinone, a common but sometimes irritating skin-lightening ingredient.

Peptides: Tiny Proteins for Muscle, Weight, and Anti-Aging Benefits—How to Choose the Right One