Glycine is the simplest amino acid, which is a building block of proteins. It plays a crucial role in the body by helping to create proteins and supporting various functions, such as the production of hormones and enzymes. Glycine is also important for the synthesis of collagen, a protein that helps maintain healthy skin, joints, and connective tissues. In addition to its role in protein synthesis, glycine acts as a neurotransmitter in the brain, promoting relaxation and better sleep. It can be found in foods like meat, fish, dairy, and legumes. Some people also take glycine supplements to support muscle recovery and improve overall health.