Glycyl-L-serine is primarily used in biochemical research as a dipeptide model to study peptide synthesis and protein interactions. It serves as a substrate for enzymes like peptidases and proteases, helping to understand their mechanisms and specificity. Additionally, it is utilized in cell culture studies to investigate amino acid transport and metabolism in various organisms. Its role in peptide bond formation and stability makes it valuable in developing peptide-based drugs and therapeutic agents. Glycyl-L-serine also finds application in studying the effects of peptides on cellular processes, such as signaling and growth regulation.