What Is Betaine Anhydrous TMG? Betaine anhydrous TMG is an amino acid and one of the building blocks of protein. TMG contains three methyl groups and functions very closely with other nutrients like choline, folic acid, and vitamin B12. Betaine anhydrous is a naturally-occurring compound found in various grain and vegetable products. Betaine anhydrous TMG is unique because it has the ability to donate one of its methyl groups, which means that it can support essential chemical processes in our bodies like liver function, cell replication, and detoxification. Betaine Anhydrous Benefits † Betaine anhydrous TMG may help strengthen muscles and improve endurance. It may also help support a healthy liver and contribute to a healthy heart. Support the muscles Promote endurance Support a healthy liver Contribute to heart health