Glycine is a non-essential amino acid that plays a critical role in various physiological functions and biochemical processes in the body. As the simplest amino acid, its structure consists of a single hydrogen atom as its side chain, which makes it unique among the 20 standard amino acids. Glycine is vital for the synthesis of proteins and contributes to the formation of collagen, which is essential for the health of skin, tendons, ligaments, and bones. In addition to its role in protein synthesis, glycine acts as a neurotransmitter in the central nervous system, where it has inhibitory effects that help regulate nerve impulses and promote relaxation. It is also involved in the synthesis of other important molecules, such as heme, the component of hemoglobin that carries oxygen in the blood. Glycine’s presence in the body influences metabolic pathways, including those related to the metabolism of glucose and fatty acids. Furthermore, it has been studied for its potential therapeutic effects, including its ability to improve sleep quality and support cognitive function. Glycine is commonly found in foods such as meat, fish, dairy products, and legumes, and is often used as a dietary supplement for its beneficial effects on overall health.