Alanyl-glutamine, also known as L-alanyl-L-glutamine, is a dipeptide consisting of L-alanine and L-glutamine. It is commonly used as a stable source of glutamine in cell culture media and as a nutritional supplement in clinical settings. Alanyl-glutamine provides a readily available form of glutamine, an important amino acid, to support cell growth and metabolism. Its stability and solubility make it a preferred choice for maintaining cell viability and function in various cell culture applications.