Acetyl Sh-Tetrapeptide-1

Acetyl Sh-Tetrapeptide-1 is a synthetic peptide—a short chain of amino acids—designed to function as a skin conditioning agent. Peptides are fragments of proteins that can penetrate the outer layers of skin and communicate with cells to support various physiological processes.This ingredient works at a cellular level to help maintain skin's structural integrity and support its natural repair mechanisms, making it a supporting player in formulations aimed at maintaining skin health and resilience.

Peptides like this one work by signalling to skin cells, influencing cellular processes that govern repair, hydration and structural maintenance. Once absorbed into the skin, the peptide can interact with cellular machinery involved in managing stress responses and maintaining the skin barrier.The research suggests connections to enzymatic pathways that regulate cellular ageing and wound repair—though the specific mechanism of this particular peptide in cosmetic formulations requires further investigation to fully characterise its effects in real-world use.

This ingredient is typically found in serums, moisturisers and targeted treatment products. Apply to clean skin, either alone or layered with other products depending on the formulation. Allow time for absorption before applying sunscreen or makeup. Consistent use over weeks is more likely to yield visible results than sporadic application.

Peptides are generally well-tolerated by most skin types. As with any new ingredient, patch test first if you have particularly sensitive or reactive skin.