Nepsilon-Acetyl-L-lysine is widely used in biochemical research as a modified amino acid to study protein structure and function. It serves as a key component in the investigation of post-translational modifications, particularly acetylation, which plays a critical role in regulating gene expression and cellular processes. This compound is also utilized in the development of peptide-based drugs and therapeutic agents, where its acetyl group can influence stability and bioavailability. Additionally, it is employed in nutritional studies to understand lysine metabolism and its impact on human health. In cosmetic formulations, it is sometimes incorporated for its potential skin-conditioning properties.