Cyclo(-Ala-Glu) is a cyclic dipeptide (diketopiperazine, DKP) composed of alanine and glutamic acid. It is a small, conformationally constrained molecule that serves as a fundamental scaffold in peptide and medicinal chemistry research. This compound is primarily investigated for its biological activities and potential as a pharmacophore. It can act as a building block for designing more complex peptide-based drugs or as a minimal structural motif to mimic bioactive conformations. Additionally, cyclic dipeptides are studied for their roles in cell signaling and as potential enzyme inhibitors. Due to its structural features, it may also find application in the development of novel drug delivery systems or as a component in advanced pharmaceutical formulations, contributing to the category of functional excipients.