Nutricost's Betaine Anhydrous is a derivative of choline and is an important nutrient. It is also known as trimethylglycine (TMG). The name Betaine Anhydrous is derived from sugar beets, the vegetable in which it was first identified. Its availability is not limited to sugar beets though, as it can be found in many different dietary sources.Betaine Anhydrous is a choline derivative that that has several benefits for those looking to improve their workouts.