Betaine
Also known as trimethylglycine. A naturally-occurring nutrient/metabolite with therapeutic applications. Supplemental betaine can help reduce homocysteine (a risk factor for cardiovascular disease) and treat non-alcoholic fatty liver disease. Betaine HCl is also a source of hydrochloric acid, and can be used to compensate for decreased production by the stomach (hypochlorhydria).
See the University of Maryland Medical Center for more information.