Acetyl Tetrapeptide-3

Acetyl Tetrapeptide-3 is a synthetic peptide—a short chain of four amino acids—created in the laboratory. Peptides are fragments of proteins that can be incorporated into skincare formulations to interact with skin cells. This particular peptide is classified as a skin-protecting ingredient, meaning it is intended to support the skin's barrier and defensive mechanisms.

It is found in a small percentage of skincare products, typically at concentrations below 1%. As a peptide, its molecular structure is relatively small, which theoretically may allow for better penetration into the skin compared to larger protein molecules, though this depends on formulation and delivery method.

Peptides work by signalling skin cells to perform specific functions. Acetyl Tetrapeptide-3 is thought to enhance the skin's natural protective responses, likely by interacting with cell receptors and encouraging the production or maintenance of barrier-supporting structures. This communication at the cellular level is the primary mechanism behind peptide-based skincare ingredients.

The ability of this peptide to penetrate the skin depends on its molecular weight and the formulation it is delivered in. Delivery methods such as microneedle technology or encapsulation systems may improve its ability to reach target skin cells, though most conventional topical products rely on natural penetration.

Acetyl Tetrapeptide-3 is typically found in serums, creams, and essences designed to support barrier health. Apply as directed by the product instructions, usually morning and evening as part of a skincare routine. It is often used alongside other barrier-supporting ingredients such as ceramides, fatty acids, or hyaluronic acid for complementary effect. Patch test if you have very sensitive skin, as with any new product.