The present invention, in some embodiments thereof, relates to nutrition and, more particularly, to magnesium and L-Carnitine containing formulations which enhance the effect of exercise on fat metabolism, and which are useful, for example, in the treatment of liver conditions, such as fatty liver disease, chronic liver disease, non-alcoholic fatty liver disease (NAFLD), alcoholic liver disease (ALD), hepatitis, fibrosis, cirrhosis and non-alcoholic steatohepatitis (NASH).