Trimethylglycine, also known as TMG or betaine, is a naturally occurring compound found in plants, animals, and microorganisms. It is involved in various physiological processes in the body, including methylation reactions and osmoregulation. TMG has been studied for its potential health benefits, which may include supporting liver function, promoting heart health, improving athletic performance, and reducing homocysteine levels. It is commonly used as a dietary supplement and can be found in foods like beets, spinach, and quinoa.